System and method for decreasing an initial buffering period of an adaptive streaming system

Information

  • Patent Grant
  • 11528540
  • Patent Number
    11,528,540
  • Date Filed
    Friday, April 9, 2021
    3 years ago
  • Date Issued
    Tuesday, December 13, 2022
    a year ago
Abstract
System and methods for selecting one of the alternative streams of encoded media from a group of alternative streams of encoded media for use during start-up of playback of the encoded media in accordance with embodiments of this invention are disclosed. The systems and methods begin by determining an estimated stability period for a current bandwidth of a communicative connection between the playback device and a remote system providing the alternative streams of encoded. A test process is then performed on the streams of encoded media to select one of streams of encoded media that provides portions of said encoded media such that an underflow condition does not occur during the estimated stability period. The streaming of encoded media is then commenced by requesting the portions of encoded media be transmitted from the remote server using the selected stream.
Description
FIELD OF THE INVENTION

This invention generally relates to start-up of playback of an encoded media in an adaptive streaming system. More particularly, this invention relates to systems and methods that can reduce the amount of encoded media buffered by a playback device prior to starting playback of the media.


BACKGROUND OF THE INVENTION

The term streaming media describes the playback of media on a playback device, where the media is stored on a server and continuously sent to the playback device over a network during playback. For purposes of this discussion, media and/or encoded media is defined as data of a work that includes video, audio, pictures, or another type of presentation that may be displayed, played or in some other way presented by a playback device. Typically, the playback device stores a sufficient quantity of media in a buffer at any given time during playback to prevent disruption of playback due to the playback device completing playback of all the buffered media prior to receipt of the next portion of media. Adaptive bit rate streaming or adaptive streaming involves detecting the present streaming conditions (e.g. the user's network bandwidth and CPU capacity) in real time and adjusting the quality of the streamed media accordingly. Typically, the source media is encoded at multiple bit rates and the playback device or client switches between streaming the different encodings depending on available resources.


Adaptive streaming solutions typically utilize either Hypertext Transfer Protocol (HTTP), published by the Internet Engineering Task Force and the World Wide Web Consortium as RFC 2616, or Real Time Streaming Protocol (RTSP), published by the Internet Engineering Task Force as RFC 2326, to stream media between a server and a playback device. HTTP is a stateless protocol that enables a playback device to request a byte range within a file. HTTP is described as stateless, because the server is not required to record information concerning the state of the playback device requesting information or the byte ranges requested by the playback device in order to respond to requests received from the playback device. RTSP is a network control protocol used to control streaming media servers. Playback devices issue control commands, such as “play” and “pause”, to the server streaming the media to control the playback of media files. When RTSP is utilized, the media server records the state of each client device and determines the media to stream based upon the instructions received from the client devices and the client's state.


In adaptive streaming systems, the source media is typically stored on a media server as a top level index file pointing to a number of alternate streams that contain the actual video and audio data. Each stream is typically stored in one or more container files. Different adaptive streaming solutions typically utilize different index and media containers. The Synchronized Multimedia Integration Language (SMIL) developed by the World Wide Web Consortium is utilized to create indexes in several adaptive streaming solutions including IIS Smooth Streaming developed by Microsoft Corporation of Redmond, Wash., and Flash Dynamic Streaming developed by Adobe Systems Incorporated of San Jose, Calif. HTTP Adaptive Bitrate Streaming developed by Apple Computer Incorporated of Cupertino, Calif. implements index files using an extended M3U playlist file (.M3U8), which is a text file containing a list of URIs that typically identify a media container file. The most commonly used media container formats are the MP4 container format specified in MPEG-4 Part 14 (i.e. ISO/IEC 14496-14) and the MPEG transport stream (TS) container specified in MPEG-2 Part 1 (i.e. ISO/IEC Standard 13818-1). The MP4 container format is utilized in IIS Smooth Streaming and Flash Dynamic Streaming. The TS container is used in HTTP Adaptive Bitrate Streaming.


When a playback device commences adaptive bitrate streaming, the playback device typically starts by requesting portions of media from the lowest bitrate streams (where alternative streams are available). As the playback device downloads the requested media, the playback device can measure the available bandwidth. In the event that there is additional bandwidth available, the playback device can switch to higher bitrate streams.


To start playback of the encoded media, the playback device often attempts to buffer an adequate amount of the requested encoded media be received and stored to provide a minimum amount of playback time prior to commencing the playback. Buffering encoded media can assure that there are no underflow conditions during playback. An underflow condition is when the playback device does not have the next portion of encoded media needed to continue the playback. However, the acquisition of an adequate amount of encoded media usually causes a delay in the start of playback of the encoded media by the device. This is typically not a problem when the playback is only periodically started and/or re-started.


However, recently devices such as tablets and other mobile playback devices have made it easier for users to search the encoded media and re-start the playback at various points in the playback. As such, the conventional start-up requiring an adequate amount of encoded media may cause unsatisfactory pauses or delays in presentation of the playback. As such, those skilled in the art are constantly striving to provide a playback start-up that requires less of the encoded media prior to commencement of the playback to minimize the time needed for a start and/or re-start of the playback.


SUMMARY OF THE INVENTION

Systems and methods for decreasing an initial buffering period in an adaptive bitrate system in accordance with embodiments of this invention are disclosed. In accordance with some embodiments, a playback device selects one of set of alternative streams for start-up of playback of encoded media from a playback position within the encoded media in the following manner. The playback device begins by determining an estimated stability period for a current bandwidth of a communicative connection between the playback device and a remote system providing the alternative streams in response to a playback request. The playback device then selects one of the alternative streams from which each of the portions of the encoded media starting from the playback position can be provided prior to a playback time for the portion of encoded media during the estimated stability period such that an underflow condition does not occur during playback of the encoded media. The playback device then commences streaming of the encoded media by requesting the portions of encoded media be transmitted using the selected one of the alternative stream from the remote server. In accordance with some of these embodiments, the selected alternative stream also can provide a sufficient number of the portions of the encoded media starting from the playback position prior to an end of the estimated stability period to provide a sufficient buffer during playback after the estimated stability period has ended.


The selection of the alternative stream to use is performed in the following manner in accordance with some embodiments of this invention. The selection process begins by selecting of the alternative streams of encoded media to test. An index of portions of the encoded media for the selected stream is read to determine the size of each of the portions of encoded media starting from the playback position in the selected stream. A download time for each of the portions in the selected stream starting from the playback position is then determined based on the size of each of portions. The download time of each of the portions starting from the playback position is then compared to the playback time of the data in each of the portions and to determine whether an underflow condition occurs during the estimated stability period. If no under flow condition will occur, the download time of each of the portions is compared to an end time of the estimated stability period to determine whether a predetermined number of the portions of the selected stream is received prior to the end of the estimated stability period to provide a sufficient buffer for playback after the estimated stability period has ended. The stream is then selected if the process determines no underflow conditions will occur during the estimated stability period and if a sufficient buffer for playback is provided after the estimated stability period ends. In accordance with some of these embodiments, the selection of the streams and comparisons are repeated until a stream is selected.


In accordance with some embodiments of this invention, an alternative selection process is performed in response to a determination that none of the streams can provide the portions without an underflow condition and/or without a sufficient buffer at the end of the estimated stability period. In accordance with some embodiment of this invention the alternative selection process is performed by discarding a first portion from each of portions from each stream starting from the playback position from consideration and then repeating the selecting of one of the alternative streams, comparing of the download time of each of the portions to the playback time of each of the portions, and comparing of the download time of each of the of portions for each off the streams with the end time of the estimated stability period for the alternative streams with the first portion of each of the first portions discarded. In accordance with other embodiments, the alternative selection process is performed by selecting one of the alternative streams from which to obtain the portions of the encoded media and requiring a predetermined number of the portions starting from the playback position be received prior to commencing playback of the encoded media.


In accordance with some embodiments of this invention, the selection of one the alternative streams to test is based on a maximum bitrate of each of the plurality of alternative streams. In accordance with some embodiments of this invention the selection process further includes determining whether the index of portions for the selected alternative stream is stored by the playback device. If the index is not stored by the playback device, the index of portions for the selected alternative stream is requested from the remote system. The index of portions of the selected alternative stream is then received by the playback device in response to the request.


In accordance with some embodiments of this invention, the estimated stability period is determined by receiving the estimated stability period from the remote system. In accordance with other embodiment of this invention, the estimated stability period is determined by reading a predefined value for the estimated stability period from a memory of the playback device. In accordance with still other embodiments, the estimated stability period is calculated by the playback device from information about the communicative connection stored in memory.





BRIEF DESCRIPTION OF THE DRAWINGS


FIG. 1 illustrates a network diagram of a media streaming system in accordance with an embodiment of the invention.



FIG. 2 illustrates a block diagram of a playback device that performs process for providing systems and methods in accordance with an embodiment of this invention.



FIG. 3 illustrates a flow diagram of a process performed by a playback device for selecting a stream to reduce the amount of buffering needed for a start-up of playback of the encoded media in accordance with embodiments of this invention.



FIG. 4 illustrates a flow diagram of a process for testing the streams of encoded media to select a stream in accordance with embodiments of this invention.



FIG. 5 illustrates flow diagram of a test process performed on the streams to determine whether an underflow condition will occur during an estimated stability period and that a sufficient buffer will be provided at an end of the estimated stability period in accordance with embodiments of this invention.



FIG. 6 illustrates a representation of playback time versus stream portion download time to describe an underflow condition in accordance with embodiments of this invention.



FIG. 7 illustrates the download times for portions of encoded media of various streams versus the estimated stability period and playback time in accordance with an embodiment of this invention.



FIG. 8 illustrates a chart showing bandwidth versus average start-up time of playback in accordance with an embodiment of this invention.





DETAILED DISCLOSURE OF THE INVENTION

Turning now to the drawings, systems and methods for decreasing an initial buffering period in an adaptive bitrate system in accordance with embodiments of the invention are illustrated. Adaptive streaming systems generally require an initial buffering period in order to obtain enough data of the encoded media to avoid underflow conditions in the latter parts of the multimedia presentation. For purposes of this discussion, an underflow condition is when a playback device does not have enough data of the encoded media in a buffer to continue playback of the encoded media. Typically, this buffering period may apply to the initial start of the system, as well as after each trick-play or seek operation. In current playback devices, many stream switching algorithms enforce a rule involving buffering a predetermined duration of video. In many instances, adaptive bitrate streaming systems download portions of video that include closed groups of pictures and can perform stream switches between closed groups of pictures. Examples of rules involving buffering a predetermined duration of video include (but are not limited to) an 8 second rule used in an adaptive bitrate streaming system that downloads closed groups of pictures have 2 second durations. The 8 second rule involves the playback device receives enough data of the encoded media to provide 8 seconds of playback prior to commencing the playback of the encoded media. In accordance with embodiments of this invention, systems and methods are provided that allow only one portion of encoded media (i.e. one closed group of pictures), to be received prior to commencing the playback. This reduces the start-up time from the time needed to receive a specific number of portions of the media to the time needed to receive a single portion of the media to greatly enhance the user's enjoyment of the playback of the encoded media.


Streaming System Architecture


Turning now to the FIG. 1, an adaptive streaming system in accordance with an embodiment of the invention is illustrated. The adaptive streaming system 10 includes a source encoder 12 configured to encode source media as a number of alternative streams. In the illustrated embodiment, the source encoder is a server. In other embodiments, the source encoder can be any processing device including a processor and sufficient resources to perform the transcoding of source media (including but not limited to video, audio, and/or subtitles). Typically, the source encoding server 12 generates a top level index to a plurality of container files containing the streams, at least a plurality of which are alternative streams. Alternative streams are streams that encode the same media content in different ways. In many instances, alternative streams encode media content (such as but not limited to video) at different maximum bitrates. In a number of embodiments, the alternative streams are encoded with different resolutions and/or at different frame rates. The top level index file and the container files are uploaded to an HTTP server 14. A variety of playback devices can then use HTTP or another appropriate stateless protocol to request portions of the top level index file and the container files via a network 16 such as the Internet.


In the illustrated embodiment, playback devices include personal computers 18, CE players, and mobile phones 20. In other embodiments, playback devices can include consumer electronics devices such as DVD players, Blu-ray players, televisions, set top boxes, video game consoles, tablets, and other devices that are capable of connecting to a server via HTTP and playing back encoded media. Although a specific architecture is shown in FIG. 1, any of a variety of architectures including systems that perform conventional streaming and not adaptive bitrate streaming can be utilized that enable playback devices to request portions of the top level index file and the container files in accordance with embodiments of the invention.


Playback Device


The processes for providing methods and systems in accordance with this invention are executed by a playback device. The relevant components in a playback device that perform the processes in accordance with an embodiment of the invention are shown in FIG. 2. One skilled in the art will recognize that playback device may include other components that are omitted for brevity without departing from this invention. The playback device 200 includes a processor 205, a non-volatile memory 210, and a volatile memory 215. The processor 205 is a processor, microprocessor, controller, or a combination of processors, microprocessor, and/or controllers that performs instructions stored in the volatile 215 or non-volatile memory 210 to manipulate data stored in the memory. The non-volatile memory 210 can store the processor instructions utilized to configure the playback device 200 to perform processes including processes in accordance with embodiments of the invention and/or data for the processes being utilized. In other embodiments, the playback device software and/or firmware can be stored in any of a variety of computer readable media appropriate to a specific application. Although a specific playback device is illustrated in FIG. 2, any of a variety of playback devices configured to store encrypted cryptographic data and to collect information concerning device characteristics can be utilized in accordance with embodiments of the invention.


Playback Start-Up Process


In accordance with many embodiments of this invention, a process for providing start-up of a playback process with only a minimal amount of data of the encoded media is provided by the playback device. In adaptive streaming systems, such as the system described with reference to FIG. 1, the data for the encoded media is generally downloaded in packets or groups of data that are referred to as portions of encoded media for purposes of this discussion. The portions of encoded media typically represent a certain amount of playback time. The encoded media is typically divided based upon the amount of data need for playback between the time needed to switch streams. The portions of encoded media in the system described with reference to an embodiment of the invention as shown in FIG. 1 represent 2 seconds of playback time in accordance with an embodiment of this invention. However, other embodiments may divide the data based on other amounts of time without departing from this invention. In prior art adaptive streaming systems, the start-up algorithms for playback systems require a certain amount of playback time which, in turn, requires that at least a specified number portions of the encoded data be downloaded prior to the playback being commenced. In accordance with the embodiment shown in FIG. 1, the amount of playback time is 8 seconds and 4 portions, each representing 2 seconds of playback time are needed to provide the required data. One skilled in the art will recognize that other time limits for the playback time and portions may be used depending on the requirements of the system without departing from embodiments of this invention. The requirement of a certain amount of data to provide a certain amount of playback is to prevent underflow conditions from occurring during playback.


An underflow condition is when the playback device does not have enough data of the encoded media stored in a buffer to continue playback. FIG. 6 illustrates an underflow condition during playback. Playback periods 601 and 602 are the first and second playback periods for playing back the encoded media. In the system described with reference to FIG. 1, first and second playback periods 601 and 502 are each two second in length. However, one skilled in the art will recognize that the exact time of each playback period is dependent on the exact type of adaptive streaming system used and the above is for exemplary purposes only. First and second download time periods 603 and 604 are the periods needed to receive first and second portions of the stream of encoded media that provides the data for playback of the encoded media during first and second playback periods 601 and 602. As shown in FIG. 6, the downloading and playback of the encoded media occur along timeline 600. First download time period 603 is completed prior to the first playback period 601. Therefore, all of the data of the encoded media needed during first playback period 601 is received prior to first playback period 601. However, second download time period 604 overlaps with second playback period 602. Thus, the system has an underflow condition because the second portion of encoded data needed for playback during second playback period 602 is not received prior to the beginning of second playback period 602.


A process performed by a playback device for selecting a stream of encoded media in an adaptive streaming system such that playback may begin after receiving one portion of the encoded data of the stream in accordance with embodiments of this invention is shown in FIG. 3. Process 300 begins by determining an estimated stability period for the bandwidth of the communicative connection between the playback device and the remote server providing the streams of encoded data in 305. The bandwidth is a known bandwidth measure that is known or calculated by the playback device based upon network and connection conditions. The estimated period of stability is the time period that the bandwidth is expected to remain stable. The estimated period of stability varies based upon the conditions of the network to which the playback device is connected. In accordance with some embodiments of this invention, the estimated stability period may be a defined value stored in a memory of the playback device. In accordance with other embodiments, the estimated stability period may be calculated by the playback device from data gathered by the playback device while monitoring the current bandwidth and previous conditions stored in a persistent memory of the device. In still other embodiments, the estimated stability period may be received from a server that calculates the estimated stability period based on feedback from the playback device or based upon feedback received from a class of devices similar to the playback device.


In 310, the playback device tests the streams of encoded media to determine whether an underflow condition will occur during playback in the estimated stability period if the stream is used. The streams are also tested to determine whether a predetermined number of portions of the encoded media will be received during the estimated stability period to provide a sufficient buffer during playback. The predetermined number is a number of portions that provide data for a specified number of playback time periods after the estimated stability period expires. For example, a system may require enough portions of data to provide for 4 time periods of playback after the end of the estimated stability period or 8 seconds of playback time in accordance with an embodiment of this invention. However, the precise amount of portions and the amount of playback time required needed may vary based upon the configuration of the system and/or playback device.


A stream is selected to use to receive the portions of the encoded media needed for playback at 315. The stream is selected because the test process determined that no underflow conditions will occur during the estimated stability period when portions of the encoded media are received using the stream. Furthermore, the stream may also satisfy a requirement that at least the predetermined number of portions of the encoded media will be received by the end of the estimated stability period to provide a sufficient buffer during playback after the estimated stability period in accordance with some embodiments of this invention. The buffer can allow the playback device to determine an adequate stream to use to receive portions of the encoded media based upon the bandwidth conditions after the estimated stability period to continue playback. After the stream is selected, the playback device transmits a request to the remote server to provide portions of the encoded media using the selected stream in 320. The playback device then begins playback of the encoded media after the first portion of the encoded media is received in 325 and process 300 ends.


A process performed by the playback device to test the streams of encoded media to select a stream that provides portions of the encoded media starting from the playback position that do not cause an underflow condition during playback in the estimated stability period and provides a predetermined number of portions prior to the end of the estimated stability period to provide a sufficient buffer during playback in accordance with an embodiment of this invention is shown in FIG. 4. Process 400 begins in 405 by determining whether a portion index for each of the streams being tested is stored in a memory of the playback machine. These portion indexes are typically part of the information downloaded by the playback device with the top level index and stream information from the container files and provide the size of each portion of the encoded media in the stream. If the playback device does not have a portion index for one or more of the streams, the playback device requests and receives the portion indexes for the streams that are not stored from the remote server in 410.


In 415, the playback device performs a test process on the streams. An embodiment of the test process is described below with reference to FIG. 5. In 420, process 400 determines whether the test process successfully selected a stream for use during the startup of playback. If a stream has been selected by the test process, process 300 ends. If a stream has not been selected, process 400 may allow a default process for start-up of playback in 425. If the default process is used, a buffer requirement is set to a maximum predetermined number of portions to provide enough data for a certain amount of playback time and a stream of encoded media is selected. In the embodiment described with reference to FIG. 1, the maximum default buffer is set to 4 portions of the encoded media in order to provide 8 seconds of playback. However, any number of portions may be used and any amount of playback time may be required without departing from this invention. The exact number of portions and amount of playback time required for the buffer depend on the adaptive streaming system used.


Alternatively, process 400 may discard the first portion of encoded data from each stream in 425 and repeat the test process from 415 using the stream with the discarded first portion. This allows the process to try to determine a stream that can be used to allow star-up of the playback of the encoded media after two portions of the encoded media are downloaded.


A process performed by playback device in 415 of process 400 to select a stream in accordance with embodiments of this invention is shown in FIG. 5. Process 500 begins in 505 by selecting a stream. In accordance with some embodiments, the stream may be selected by the maximum bitrate of each stream in either ascending or descending order. However, those skilled in the art will recognize that other properties of the encoded media in the streams, such as resolution and frame rate may also be used for the selection of the stream to test without departing from embodiments of this invention.


After the stream is selected, the portion index for the selected stream is read in 510. Process 400 then determines the portions of the stream starting from the playback position of the encoded media and the size of each portion that may be downloaded during the estimated stability period in 515. The information about the size of the portions is then used to determine the download time of each portion of the selected stream in 520. In 525, the download time of each of the portions starting from the playback position is compared to a playback time for the information to determine whether an underflow condition may occur. If process 500 determines that an underflow condition may occur for the selected stream, a new stream is selected, if available, in 540 and process 500 is repeated from 510 for the subsequent stream. If there are no more streams available, process 500 may return an indication that test process 500 was unsuccessful in selecting a stream.


If process 500 determines that no underflow condition may occur, process 500 determines whether a predetermined number of portions of the stream starting from the playback position of the encoded media may be downloaded prior to the end of the estimated stability period. If it is determined that at least the predetermined number of portions will be downloaded, the stream will provide a sufficient buffer for playback at the end of the estimated stability period and process 500 selects the stream for use in 535. Otherwise, a new stream is selected, if available, in 540 is repeated from 510 for the subsequent stream. If there are no more streams available, process 500 may return an indication that test process 500 was unsuccessful in selecting a stream.


Example of Test Process


An illustration of the selection of a stream for use in receiving portions of the encoded media in accordance with an embodiment is provided with respect to FIG. 7. Four streams, 701-704, that may be used by a playback device to receive portions of the encoded media for playback of the encoded media in an embodiment of this invention are shown. The playback device uses the above described process to select one of streams for use in playback. Streams 701-704 are shown in descending order of maximum bitrates and the streams are selected in the test process in accordance with maximum bitrates. In the example, the test process begins be determining the estimated stability period. The end of the estimated stability period is shown as line 705. The test process first reads the index of portions of encoded data of stream 701 and determines the download times of the portions starting from the playback position in the encoded media as shown. The download times are then compared to the playback times of the portions. As can be seen in FIG. 7, the download time of the second portion of stream 701 does not end prior to the beginning of the second playback time. Therefore, the test process moves to the next stream with the next highest maximum bitrate, stream 702.


The test process reads the portion index for stream 702 and determines the playback times for the portions of encoded media starting from the playback position as shown in line 702. The playback times of the portions of stream 702 are compared to the playback times. As can be seen in FIG. 7, the download time of the second portion of stream 702 does not end prior to the beginning of the second playback time. Therefore, the test process moves to the next stream with the next highest maximum bitrate, stream 703. The test process reads the portion index for stream 703 and determines the playback times for the portions of encoded media starting from the playback position as shown in line 703. The playback times of the portions of stream 703 are compared to the playback times. As can be seen from line 703, no underflow conditions may occur as all of the portions will be received prior to the corresponding playback time. Thus, the process determines whether a predetermined number of portions will be received prior to the end of the estimated stability period using stream 703. In this case, the stability period ends after the 10th playback period or 20 seconds. Therefore, the stream must be able to provide at least 28 seconds of playback or 14 portions of encoded media prior to the end of the estimated stability period. Stream 703 only provides 13 complete portions prior to the end of the estimated stability period. As such, the test process does not select stream 703 for use and selects the stream with next highest maximum bandwidth, stream 704 for testing. The test process reads the portion index for stream 704 and determines the playback times for the portions of encoded media starting from the playback position as shown in line 704. The playback times of the portions of stream 704 are compared to the playback times. As can be seen from line 704, no underflow conditions may occur as all of the portions will be received prior to the corresponding playback time prior to the end of the estimated stability period. Thus, the test process then determines whether the predetermined number of portions may be downloaded prior to the end of the estimated stability period. As seen in line 704, 15 portions of encoded media may be received prior to the end of the estimated stability period. Thus, the test process selects stream 704 to provide the portions of encoded media for playback as stream 704 will not cause underflow conditions during the estimated period of stability and provides a sufficient buffer at the end of the estimated period of stability.


Improved Playback Start Up Time



FIG. 8 illustrates a chart of playback start-up times for an embodiment in accordance with this invention. In the described embodiment, the adaptive streaming system provides 9 streams. The bandwidth of the communicative connection between the playback device and remote server is varied between 500 Kbps and 10 Mbps. The estimated stability period for the bandwidth is 20 seconds and the system has a constant change in seek times. Line 801 shows the selected streams for the playback. The time of the start-up is shown be line 802. The bandwidth is shown along the x-axis and the time is shown along the y-axis. As can be seen from the chart, the average playback start-up time is approximately 1.8 seconds after a single portion of the encoded media has been downloaded. This represents a significant improvement over the typical 8 seconds for a conventional playback start-up.


The above is description of embodiments of systems and methods in accordance with the present invention. It is foreseen that other skilled in the art will design alternative systems that infringe on this invention as set forth in the following claims either literally or through the Doctrine of Equivalents.

Claims
  • 1. A method of determining whether an underflow condition will occur in a particular stream of encoded media during a stability period, the method comprising: requesting playback of content from one or more servers;estimating the stability period of a communicative connection between a playback device and the one or more servers, where the estimated stability period is a period of time that the communicative connection is expected to remain stable based on bandwidth conditions;selecting one of a plurality of streams of encoded media to be assessed, where the selected stream comprises encoded media divided into a plurality of portions, each portion having the same playback duration;determining a download time for each of the plurality of portions based on the size of each of the plurality of portions; anddetermining whether an underflow condition will occur in the selected stream during the estimated stability period by comparing the determined download time of each of the plurality of positions to the playback duration of each of the plurality of portions and accumulating the difference.
  • 2. The method of claim 1, wherein selecting one of the plurality of streams of encoded media to be assessed comprises selecting the stream of encoded media with the highest maximum bit rate.
  • 3. The method of claim 2, wherein selecting one of the plurality of streams of encoded media to be assessed, determining a download time for each of the plurality of portions, and determining whether an underflow condition will occur in the selected stream is repeated until a stream is selected where an underflow condition will not occur.
  • 4. The method of claim 3, wherein the next selected one of the plurality of streams of encoded media to be assessed is the stream of encoded media with the next highest maximum bit rate.
  • 5. The method of claim 1, wherein determining the download time for each of the plurality of portions comprises reading an index of portions of the selected stream of encoded media to determine the size of each of the plurality of portions of the stream of encoded media.
  • 6. The method of claim 1, further comprising: discarding a first portion from each of the plurality of portions of the selected stream from consideration in response to a determination that the plurality of portions of the stream of the encoded media cannot be provided using any of the plurality of streams prior to playback time during the estimated stability period; andrepeating the steps of selecting one of the plurality of streams, determining a download time for each of the plurality of portions without the first portion, and determining whether an underflow condition will occur without the first portion.
  • 7. The method of claim 1, further comprising performing an alternative selection process for selecting one of the plurality of alternative streams in response to a determination that an underflow condition will occur during the estimated stability period.
  • 8. The method of claim 1, further comprising, in response to a determination that an underflow will occur in all of the plurality of streams during the estimated stability period, requiring a predetermined number of the plurality of portions be received prior to commencing playback of the encoded media.
  • 9. The method of claim 1, wherein determining the estimated stability period comprises receiving the estimated stability period from the one or more servers.
  • 10. The method of claim 1, wherein determining the estimated stability period comprises reading a predefined value for the estimated stability period from a memory of the playback device.
  • 11. A playback device for playing back a stream of encoded media comprising: a memory;a processor configured via a client application stored in the memory to: request playback of content from one or more servers;estimate a stability period of a communicative connection between a playback device and the one or more servers, where the estimated stability period is a period of time that the communicative connection is expected to remain stable based on bandwidth conditions;select one of a plurality of streams of encoded media to be assessed, where the selected stream comprises encoded media divided into a plurality of portions, each portion having the same playback duration;determine a download time for each of the plurality of portions based on the size of each of the plurality of portions; anddetermine whether an underflow condition will occur in the selected stream during the estimated stability period by comparing the determined download time of each of the plurality of positions to the playback duration of each of the plurality of portions and accumulating the difference.
  • 12. The playback device of claim 11, wherein selecting one of the plurality of streams of encoded media to be assessed comprises selecting the stream of encoded media with the highest maximum bit rate.
  • 13. The playback device of claim 12, wherein selecting one of the plurality of streams of encoded media to be assessed, determining a download time for each of the plurality of portions, and determining whether an underflow condition will occur in the selected stream is repeated until a stream is selected where an underflow condition will not occur.
  • 14. The playback device of claim 13, wherein the next selected one of the plurality of streams of encoded media to be assessed is the stream of encoded media with the next highest maximum bit rate.
  • 15. The playback device of claim 11, wherein determining the download time for each of the plurality of portions comprises reading an index of portions of the selected stream of encoded media to determine the size of each of the plurality of portions of the stream of encoded media.
  • 16. The playback device of claim 11, wherein the processor is further configured via the client application stored in the memory to: discard a first portion from each of the plurality of portions of the selected stream from consideration in response to a determination that the plurality of portions of the stream of the encoded media cannot be provided using any of the plurality of streams prior to playback time during the estimated stability period; andrepeat the steps of selecting one of the plurality of streams, determining a download time for each of the plurality of portions without the first portion, and determining whether an underflow condition will occur without the first portion.
  • 17. The playback device of claim 11, wherein the processor is further configured via the client application stored in the memory to perform an alternative selection process for selecting one of the plurality of alternative streams in response to a determination that an underflow condition will occur during the estimated stability period.
  • 18. The playback device of claim 11, wherein the processor is further configured via the client application stored in the memory to, in response to a determination that an underflow will occur in all of the plurality of streams during the estimated stability period, require a predetermined number of the plurality of portions be received prior to commencing playback of the encoded media.
  • 19. The playback device of claim 11, wherein determining the estimated stability period comprises receiving the estimated stability period from the one or more servers.
  • 20. The playback device of claim 11, wherein determining the estimated stability period comprises reading a predefined value for the estimated stability period from a memory of the playback device.
CROSS-REFERENCE TO RELATED APPLICATIONS

The current application is a continuation of U.S. patent application Ser. No. 15/937,715, filed Mar. 27, 2018, entitled “System and Method for Decreasing an Initial Buffering Period of an Adaptive Streaming System” to Shivadas et al. and will issue as U.S. Pat. No. 10,979,782, which is a continuation of U.S. patent application Ser. No. 13/631,017, filed Sep. 28, 2012, entitled “System and Method for Decreasing an Initial Buffering Period of an Adaptive Streaming System” to Shivadas et al. and issued as U.S. Pat. No. 9,936,267, which claims priority to U.S. Provisional Patent Application No. 61/696,095, filed Aug. 31, 2012, titled “System and Method for Decreasing an Initial Buffering Period of an Adaptive Streaming System”, the disclosures of which are incorporated herein by reference.

US Referenced Citations (193)
Number Name Date Kind
5400401 Wasilewski et al. Mar 1995 A
5574785 Ueno et al. Nov 1996 A
5600721 Kitazato Feb 1997 A
5621794 Matsuda et al. Apr 1997 A
5642338 Fukushima et al. Jun 1997 A
5805700 Nardone et al. Sep 1998 A
5813010 Kurano et al. Sep 1998 A
5854873 Mori et al. Dec 1998 A
5907658 Murase et al. May 1999 A
5923869 Kashiwagi et al. Jul 1999 A
6002834 Hirabayashi et al. Dec 1999 A
6009237 Hirabayashi et al. Dec 1999 A
6016381 Taira et al. Jan 2000 A
6057832 Lev et al. May 2000 A
6065050 DeMoney May 2000 A
6266483 Okada et al. Jul 2001 B1
6282320 Hasegawa et al. Aug 2001 B1
6320905 Konstantinides Nov 2001 B1
6351538 Uz Feb 2002 B1
6373803 Ando et al. Apr 2002 B2
6385673 Demoney May 2002 B1
6415031 Colligan et al. Jul 2002 B1
6445877 Okada et al. Sep 2002 B1
6453115 Boyle Sep 2002 B1
6453116 Ando et al. Sep 2002 B1
6504873 Vehvilaeinen Jan 2003 B1
6512883 Shim et al. Jan 2003 B2
6594699 Sahai et al. Jul 2003 B1
6654933 Abbott et al. Nov 2003 B1
6671408 Kaku Dec 2003 B1
6690838 Zhou Feb 2004 B2
6724944 Kalevo et al. Apr 2004 B1
6751623 Basso et al. Jun 2004 B1
6813437 Ando et al. Nov 2004 B2
6871006 Oguz et al. Mar 2005 B1
6912513 Candelore Jun 2005 B1
6931531 Takahashi Aug 2005 B1
6957350 Demos Oct 2005 B1
6970564 Kubota et al. Nov 2005 B1
6983079 Kim Jan 2006 B2
7006757 Ando et al. Feb 2006 B2
7007170 Morten Feb 2006 B2
7020287 Unger Mar 2006 B2
7047309 Baumann et al. May 2006 B2
7151832 Fetkovich et al. Dec 2006 B1
7188183 Paul et al. Mar 2007 B1
7212726 Zetts May 2007 B2
7242772 Tehranchi Jul 2007 B1
7274861 Yahata et al. Sep 2007 B2
7295673 Grab et al. Nov 2007 B2
7349886 Morten et al. Mar 2008 B2
7352956 Winter et al. Apr 2008 B1
7382879 Miller Jun 2008 B1
7397853 Kwon et al. Jul 2008 B2
7400679 Kwon et al. Jul 2008 B2
7418132 Hoshuyama Aug 2008 B2
7457415 Reitmeier et al. Nov 2008 B2
7499930 Naka et al. Mar 2009 B2
7546641 Robert et al. Jun 2009 B2
7639921 Seo et al. Dec 2009 B2
7640435 Morten Dec 2009 B2
7711052 Hannuksela et al. May 2010 B2
7770200 Brooks et al. Aug 2010 B2
7853980 Pedlow, Jr. et al. Dec 2010 B2
7864186 Robotham et al. Jan 2011 B2
7908393 Marr et al. Mar 2011 B2
7945143 Yahata et al. May 2011 B2
7949775 Virdi et al. May 2011 B2
8009575 Spain et al. Aug 2011 B1
8099757 Riedl et al. Jan 2012 B2
8131875 Chen Mar 2012 B1
8169916 Pai et al. May 2012 B1
8243924 Chen et al. Aug 2012 B2
8286213 Seo Oct 2012 B2
8312079 Newsome et al. Nov 2012 B2
8369421 Kadono et al. Feb 2013 B2
8516144 Hsu et al. Aug 2013 B2
8649669 Braness et al. Feb 2014 B2
8683066 Hurst et al. Mar 2014 B2
8782268 Pyle et al. Jul 2014 B2
8812662 Soroushian et al. Aug 2014 B2
8819116 Tomay et al. Aug 2014 B1
8832297 Soroushian Sep 2014 B2
8849950 Stockhammer et al. Sep 2014 B2
8918533 Chen et al. Dec 2014 B2
8997160 Hunt et al. Mar 2015 B2
9038116 Knox et al. May 2015 B1
9088527 Manor et al. Jul 2015 B2
9124642 Choudhury et al. Sep 2015 B2
9313249 Soroushian et al. Apr 2016 B2
9420024 Pearson et al. Aug 2016 B2
9491498 Brooks et al. Nov 2016 B2
9521178 Freeman, II et al. Dec 2016 B1
9936267 Shivadas et al. Apr 2018 B2
20010021276 Zhou Sep 2001 A1
20010052077 Fung et al. Dec 2001 A1
20010052127 Seo et al. Dec 2001 A1
20020048450 Zetts Apr 2002 A1
20020067432 Kondo et al. Jun 2002 A1
20020135607 Kato et al. Sep 2002 A1
20020141503 Kobayashi et al. Oct 2002 A1
20020154779 Asano et al. Oct 2002 A1
20020164024 Arakawa et al. Nov 2002 A1
20020169971 Asano et al. Nov 2002 A1
20030002577 Pinder Jan 2003 A1
20030044080 Frishman et al. Mar 2003 A1
20030053541 Sun et al. Mar 2003 A1
20030063675 Kang et al. Apr 2003 A1
20030077071 Lin et al. Apr 2003 A1
20030135742 Evans Jul 2003 A1
20030142594 Tsumagari et al. Jul 2003 A1
20030206717 Yogeshwar et al. Nov 2003 A1
20040001594 Krishnaswamy et al. Jan 2004 A1
20040022391 Obrien Feb 2004 A1
20040028227 Yu Feb 2004 A1
20040037421 Truman Feb 2004 A1
20040047592 Seo et al. Mar 2004 A1
20040047607 Seo et al. Mar 2004 A1
20040076237 Kadono et al. Apr 2004 A1
20040081333 Grab et al. Apr 2004 A1
20040093494 Nishimoto et al. May 2004 A1
20040101059 Joch et al. May 2004 A1
20040107356 Shamoon et al. Jun 2004 A1
20050013494 Srinivasan et al. Jan 2005 A1
20050063541 Candelore Mar 2005 A1
20050076232 Kawaguchi Apr 2005 A1
20050144468 Northcutt Jun 2005 A1
20050177741 Chen et al. Aug 2005 A1
20050243912 Kwon et al. Nov 2005 A1
20050265555 Pippuri Dec 2005 A1
20060002425 Mane et al. Jan 2006 A1
20060013568 Rodriguez Jan 2006 A1
20060031564 Brassil et al. Feb 2006 A1
20060165163 Burazerovic et al. Jul 2006 A1
20070047645 Takashima Mar 2007 A1
20070067472 Maertens et al. Mar 2007 A1
20070083467 Lindahl et al. Apr 2007 A1
20070086485 Vega-garcia et al. Apr 2007 A1
20070180051 Kelly et al. Aug 2007 A1
20080086570 Dey et al. Apr 2008 A1
20080101718 Yang et al. May 2008 A1
20080137847 Candelore et al. Jun 2008 A1
20090010622 Yahata et al. Jan 2009 A1
20090013195 Ochi et al. Jan 2009 A1
20090067535 Koudo Mar 2009 A1
20090077143 Macy, Jr. Mar 2009 A1
20090106082 Senti et al. Apr 2009 A1
20090132599 Soroushian et al. May 2009 A1
20090144425 Marr et al. Jun 2009 A1
20090178090 Oztaskent Jul 2009 A1
20090249081 Zayas Oct 2009 A1
20090282162 Mehrotra et al. Nov 2009 A1
20090300203 Virdi et al. Dec 2009 A1
20090310819 Hatano Dec 2009 A1
20100142915 Mcdermott et al. Jun 2010 A1
20100235542 Visharam et al. Sep 2010 A1
20100306373 Wormley Dec 2010 A1
20100306810 Brooks et al. Dec 2010 A1
20110010466 Fan et al. Jan 2011 A1
20110058675 Brueck et al. Mar 2011 A1
20110066673 Outlaw Mar 2011 A1
20110096828 Chen et al. Apr 2011 A1
20110103374 Lajoie et al. May 2011 A1
20110135090 Chan et al. Jun 2011 A1
20110145858 Philpott et al. Jun 2011 A1
20110173345 Knox et al. Jul 2011 A1
20110179185 Wang et al. Jul 2011 A1
20110197261 Dong et al. Aug 2011 A1
20110246661 Manzari et al. Oct 2011 A1
20110296048 Knox et al. Dec 2011 A1
20110314130 Strasman Dec 2011 A1
20120005312 Mcgowan et al. Jan 2012 A1
20120042090 Chen et al. Feb 2012 A1
20120047542 Lewis et al. Feb 2012 A1
20120110120 Willig et al. May 2012 A1
20120141089 Hunt Jun 2012 A1
20120167132 Mathews et al. Jun 2012 A1
20120173751 Braness et al. Jul 2012 A1
20120177101 van der Schaar Jul 2012 A1
20120179834 van der Schaar Jul 2012 A1
20120311174 Bichot et al. Dec 2012 A1
20120324519 Laughlin Dec 2012 A1
20120331167 Hunt Dec 2012 A1
20130007200 van der Schaar et al. Jan 2013 A1
20130007263 Soroushian et al. Jan 2013 A1
20130007297 Soroushian et al. Jan 2013 A1
20130013803 Bichot et al. Jan 2013 A1
20130080267 McGowan Mar 2013 A1
20140068096 Shivadas et al. Mar 2014 A1
20140140253 Lohmar et al. May 2014 A1
20140149557 Lohmar et al. May 2014 A1
20140365651 Soroushian et al. Dec 2014 A1
20150288530 Oyman Oct 2015 A1
Foreign Referenced Citations (23)
Number Date Country
2237293 Jul 1997 CA
1453319 Sep 2004 EP
1283640 Oct 2006 EP
2180664 Apr 2010 EP
2360923 Aug 2011 EP
20040039852 May 2004 KR
20060106250 Oct 2006 KR
2328040 Jun 2008 RU
2000049762 Aug 2000 WO
2000049763 Aug 2000 WO
2003047262 Jun 2003 WO
2004012378 Feb 2004 WO
2004100158 Nov 2004 WO
2005008385 Jan 2005 WO
2005015935 Feb 2005 WO
2009006302 Jan 2009 WO
2009109976 Sep 2009 WO
2011087449 Jul 2011 WO
2011101371 Aug 2011 WO
2011103364 Aug 2011 WO
2013002828 Jan 2013 WO
2013002834 Jan 2013 WO
2013002835 Jan 2013 WO
Non-Patent Literature Citations (102)
Entry
Information Technology—MPEG Systems Technologies—Part 7: Common Encryption in ISO Base Media File Format Files (ISO/IEC 23001-7), Apr. 1, 2015, 24 pgs.
International Preliminary Report on Patentability for International Application No. PCT/US2011/064684, dated Mar. 4, 2014, 5 pgs.
International Preliminary Report on Patentability for International Application No. PCT/US2011/068156, Report dated Jan. 7, 2014, 9 Pgs.
International Preliminary Report on Patentability for International Application No. PCT/US2011/068264, Search Completed Jan. 7, 2014, dated Jan. 16, 2014, 5 pgs.
International Search Report and Written Opinion for Application PCT/US2011/068264, Search Completed Mar. 30, 2012, dated May 1, 2012, 6 pgs.
International Search Report and Written Opinion for International Application No. PCT/US2011/068156, Search completed Apr. 7, 2012, dated May 1, 2012, 11 Pgs.
International Search Report and Written Opinion for International Application PCT/US2011/064684, Search Completed Mar. 26, 2012, dated Apr. 10, 2012, 7 pgs.
ISO/IEC 14496-12 Information technology—Coding of audio-visual objects—Part 12: ISO base media file format, Feb. 1, 2004 (“MPEG-4 Part 12 Standard”), 62 pgs.
ISO/IEC 14496-12:2008(E) Informational Technology—Coding of Audio-Visual Objects Part 12: ISO Base Media File Format, Oct. 2008, 120 pgs.
ISO/IEC FCD 23001-6 MPEG systems technologies Part 6: Dynamic adaptive streaming over HTTP (DASH), Jan. 28, 2011, 86 pgs.
Microsoft Corporation, Advanced Systems Format (ASF) Specification, Revision 01.20.03, Dec. 2004, 121 pgs.
MPEG-DASH presentation at Streaming Media West 2011, Nov. 2011, 14 pgs.
Pomelo, LLC Tech Memo, “Analysis of Netflix's Security Framework for ‘Watch Instantly’ Service”, Mar.-Apr. 2009, 18 pgs.
Server-Side Stream Repackaging (Streaming Video Technologies Panorama, Part 2), Jul. 2011, 15 pgs.
Text of ISO/IEC 23001-6: Dynamic adaptive streaming over HTTP (DASH), Oct. 2010, 71 pgs.
Universal Mobile Telecommunications System (UMTS), ETSI TS 126 233 V9.1.0 (Jun. 2011) 3GPP TS 26.233, Version 9.1.0, Release 9, 18 pgs.
Universal Mobile Telecommunications Systems (UMTS); ETSI TS 126 244 V9.4.0 (May 2011) 3GPP TS 26.244, Version 9.4.0, Release 9, 58 pgs.
Apple HTTP Live Streaming specification, Aug. 2017, 60 pgs.
“Data Encryption Decryption using AES Algorithm, Key and Salt with Java Cryptography Extension”, Available at https://www.digizol.com/2009/10/java-encrypt-decrypt-jce-salt.html, Oct. 2009, 6 pgs.
“Delivering Live and On-Demand Smooth Streaming”, Microsoft Silverlight, 2009, 28 pgs.
“HTTP Based Adaptive Streaming over HSPA”, Apr. 2011, 73 pgs.
HTTP Live Streaming, Mar. 31, 2011, 24 pgs.
HTTP Live Streaming, Sep. 30, 2011, 33 pgs.
“Information Technology—Coding of Audio Visual Objects—Part 2: Visual”, International Standard, ISO/IEC 14496-2, Third Edition, Jun. 1, 2004, pp. 1-724. (presented in three parts).
“Java Cryptography Architecture API Specification & Reference”, Available at https://docs.oracle.eom/javase/1.5.0/docs/guide/security/CryptoSpec.html, Jul. 25, 2004, 68 pgs.
“Java Cryptography Extension, javax.crypto.Cipher class”, Available at https://docs.oracle.com/javase/1.5.0/docs/api/javax/crypto/Cipher.html, 2004, 24 pgs.
“JCE Encryption—Data Encryption Standard (DES) Tutorial”, Available at https://mkyong.com/java/jce-encryption-data-encryption-standard-des-tutorial/, Feb. 25, 2009, 2 pgs.
“Live and On-Demand Video with Silverlight and IIS Smooth Streaming”, Microsoft Silverlight, Windows Server Internet Information Services 7.0, Feb. 2010, 15 pgs.
Microsoft Smooth Streaming specification, Jul. 22, 2013, 56 pgs.
“MPEG-2, Part 1, ISO/IEC 13818-1”, Information technology—Generic Coding of Moving Pictures and Associated Audio: Systems, 161 pgs., Nov. 13, 1994.
“MPEG-4, Part 14, ISO/IEC 14496-14”, Information technology—Coding of audiovisual objects, 18 pgs., Nov. 15, 2003.
“OpenDML AVI File Format Extensions Version 1.02”, OpenDMLAVI MJPEG File Format Subcommittee. Last revision: Feb. 28, 1996. Reformatting: Sep. 1997, 42 pgs.
“Single-Encode Streaming for Multiple Screen Delivery”, Telestream Wowza Media Systems, 2009, 6 pgs.
“The MPEG-DASH Standard for Multimedia Streaming Over the Internet”, IEEE MultiMedia, vol. 18, No. 4, 2011, 7 pgs.
“Video Publishers Turning to HD Online Video to Boost Competitive Edge and Increase Revenues”, Business Wire, Inc., Apr. 22, 2009, 2 pages, retrieved from https://global.factiva.com/ga/default.aspx.
“Windows Media Player 9”, Microsoft, Mar. 23, 2017, 3 pgs.
Abomhara et al., “Enhancing Selective Encryption for H.264/AVC Using Advanced Encryption Standard”, International Journal of Computer Theory and Engineering, Apr. 2010, vol. 2, No. 2, pp. 223-229.
Alattar et al., “Improved Selective Encryption Techniques for Secure Transmission of MPEG Video Bit-Streams”, In Proceedings 1999 International Conference on Image Processing (Cat. 99CH36348), vol. 4, IEEE, 1999, pp. 256-260.
Antoniou et al., “Adaptive Methods for the Transmission of Video Streams in Wireless Networks”, Deliverable 2.2, Feedback Algorithms for the Increase of the Objective Quality, 2015, 50 pgs.
Apostolopoulos et al., “Secure Media Streaming and Secure Transcoding”, Multimedia Security Technologies for Digital Rights Management, 2006, pp. 241-273.
Asai et al., “Essential Factors for Full-Interactive VOD Server: Video File System, Disk Scheduling, Network”, Proceedings of Globecom '95, Nov. 14-16, 1995, 6 pgs.
Begen et al., “Watching Video over the Web Part 1: Streaming Protocols”, IEEE Internet Computing, Mar. 1, 2011, vol. 15, Issue 2, pp. 54-63.
Beker et al., “Cipher Systems: The Protection of Communications”, Chapter 8: Applying Cipher Systems, 1982, 40 pgs.
Bocharov et al., “Portable Encoding of Audio-Video Objects, The Protected Interoperable File Format (PIFF)”, Microsoft Corporation, First Edition Sep. 8, 2009, 30 pgs.
Bulterman et al., “Synchronized Multimedia Integration Language (SMIL 3.0)”, W3C Recommendation, Dec. 1, 2008, https://www.w3.org/TR/2008/REC-SMIL3-20081201/, 321 pgs. (Presented in five parts).
Cahill et al., “Locally Adaptive Deblocking Filter for Low Bit Rate Video”, Proceedings 2000 International Conference on Image Processing, Sep. 10-13, 2000, Vancouver, BC, Canada, pp. 664-667.
Candelore et al., U.S. Appl. No. 60/372,901, filed Apr. 16, 2002, 5 pgs.
Chaddha et al., “A Frame-work for Live Multicast of Video Streams over the Internet”, Proceedings of 3rd IEEE International Conference on Image Processing, Sep. 19, 1996, Lausanne, Switzerland, 4 pgs.
Cheng, “Partial Encryption for Image and Video Communication”, University of Alberta, Department of Computing Science, Thesis, Fall 1998, 95 pgs.
Cheng et al., “Partial Encryption of Compressed Images and Videos”, IEEE Transactions on Signal Processing, vol. 48, No. 8, Aug. 2000, 13 pgs.
Cheung et al., “On the Use of Destination Set Grouping to Improve Fairness in Multicast Video Distribution”, Proceedings of IEEE INFOCOM'96, Conference on Computer Communications, vol. 2, IEEE, Jul. 18, 1995, 23 pgs.
Collet, “Delivering Protected Content: An Approach for Next Generation Mobile Technologies”, University of Namur, Thesis, 2010, 84 pgs.
Diamantis et al., “Real Time Video Distribution using Publication through a Database”, Proceedings SIBGRAPI'98. International Symposium on Computer Graphics, Image Processing, and Vision (Cat. No. 98EX237), Oct. 1990, 8 pgs.
Dworkin, “Recommendation for Block Cipher Modes of Operation: Methods and Techniques”, NIST Special Publication 800-38A, Computer Security, Dec. 2001, 66 pgs.
Fang et al., “Real-Time Deblocking Filter for MPEG-4 Systems”, Asia-Pacific Conference on Circuits and Systems, Oct. 28-31, 2002, Bali, Indonesia, pp. 541-544.
Fecheyr-Lippens, “A Review of HTTP Live Streaming”, Jan. 2010, 38 pgs.
Fielding et al., “Hypertext Transfer Protocol—HTTP1.1”, Network Working Group, RFC 2616, Jun. 1999, 114 pgs.
Fukuda et al., “Reduction of Blocking Artifacts by Adaptive DCT Coefficient Estimation in Block-Based Video Coding”, Proceedings 2000 International Conference on Image Processing, Sep. 10-13, 2000, Vancouver, BC, Canada, pp. 969-972.
Gannes, “The Lowdown on Apple's HTTP Adaptive Bitrate Streaming”, GigaOM, Jun. 10, 2009, 12 pgs.
Huang, U.S. Pat. No. 7,729,426, U.S. Appl. No. 11/230,794, filed Sep. 20, 2005, 143 pgs.
Huang et al., “Adaptive MLP post-processing for block-based coded images”, IEEE Proceedings—Vision, Image and Signal Processing, vol. 147, No. 5, Oct. 2000, pp. 463-473.
Huang et al., “Architecture Design for Deblocking Filter in H.264/JVT/AVC”, 2003 International Conference on Multimedia and Expo, Jul. 6-9, 2003, Baltimore, MD, 4 pgs.
Jain et al., U.S. Appl. No. 61/522,623, filed Aug. 11, 2011, 44 pgs.
Jung et al., “Design and Implementation of an Enhanced Personal Video Recorder for DTV”, IEEE Transactions on Consumer Electronics, vol. 47, No. 4, Nov. 2001, pp. 915-920.
Kalva, Hari, “Delivering MPEG-4 Based Audio-Visual Services”, Kluwer Academic Publishers, 2001, 113 pgs.
Kang et al., “Access Emulation and Buffering Techniques for Steaming of Non-Stream Format Video Files”, IEEE Transactions on Consumer Electronics, vol. 43, No. 3, Aug. 2001, 7 pgs.
Kim et al., “A Deblocking Filter with Two Separate Modes in Block-based Video Coding”, IEEE Transactions on Circuits and Systems for Video Technology, vol. 9, No. 1, Feb. 1999, pp. 156-160.
Kim et al., “Tree-Based Group Key Agreement”, ACM Transactions on Information and System Security, vol. 7, No. 1, Feb. 2004, pp. 60-96.
Laukens, “Adaptive Streaming—A Brief Tutorial”, EBU Technical Review, 2011, 6 pgs.
Legault et al., “Professional Video Under 32-bit Windows Operating Systems”, SMPTE Journal, vol. 105, No. 12, Dec. 1996, 8 pgs.
Li et al., “Layered Video Multicast with Retransmission (LVMR): Evaluation of Hierarchical Rate Control”, Proceedings of IEEE INFOCOM'98, the Conference on Computer Communications, Seventeenth Annual Joint Conference of the IEEE Computer and Communications Societies, Gateway to the 21st Century, Cat. No. 98, vol. 3, 1998, 26 pgs.
List et al., “Adaptive Deblocking Filter”, IEEE Transactions on Circuits and Systems for Video Technology, vol. 13, No. 7, Jul. 2003, pp. 614-619.
Liu et al., “Rate adaptation for adaptive HTTP streaming”, MMSys '11 Proceedings of the second annual ACM conference on Multimedia systems, Feb. 23-25, 2011, San Jose, CA, USA, pp. 169-174.
Massoudi et al., “Overview on Selective Encryption of Image and Video: Challenges and Perspectives”, EURASIP Journal on Information Security, Nov. 2008, 18 pgs.
McCanne et al., “Receiver-driven Layered Multicast”, Conference proceedings on Applications, Technologies, Architectures, and Protocols for Computer Communications, Aug. 1996, 14 pgs.
Meier, “Reduction of Blocking Artifacts in Image and Video Coding”, IEEE Transactions on Circuits and Systems for Video Technology, vol. 9, No. 3, Apr. 1999, pp. 490-500.
Nelson, “Smooth Streaming Deployment Guide”, Microsoft Expression Encoder, Aug. 2010, 66 pgs.
Newton et al., “Preserving Privacy by De-identifying Facial Images”, Carnegie Mellon University School of Computer Science, Technical Report, CMU-CS-03-119, Mar. 2003, 26 pgs.
O'Brien, U.S. Appl. No. 60/399,846, filed Jul. 30, 2002, 27 pgs.
O'Rourke, “Improved Image Decompression for Reduced Transform Coding Artifacts”, IEEE Transactions on Circuits and Systems for Video Technology, vol. 5, No. 6, Dec. 1995, pp. 490-499.
Park et al., “A Postprocessing Method for Reducing Quantization Effects in Low Bit-Rate Moving Picture Coding”, IEEE Transactions on Circuits and Systems for Video Technology, vol. 9, No. 1, Feb. 1999, pp. 161-171.
Richardson, “H.264 and MPEG-4 Video Compression”, Wiley, 2003, 306 pgs. (Presented in two parts).
Riiser et al., “Video Streaming Using a Location-based Bandwidth-Lookup Service for Bitrate Planning”, ACM Transactions on Multimedia Computing, Communications, and Applications, vol. 8, Issue 3, Article No. 24, Jul. 2012, 24 pages.
Schulzrinne, H., “Real Time Streaming Protocol 2.0 (RTSP): draft-ietfmmusic-rfc2326bis-27”, MMUSIC Working Group of the Internet Engineering Task Force (IETF), 296 pgs., Mar. 9, 2011.
Sima et al., “An Efficient Architecture for Adaptive Deblocking Filter of H.264 AVC Video Coding”, IEEE Transactions on Consumer Electronics, vol. 50, No. 1, Feb. 2004, pp. 292-296.
Spanos et al., “Performance Study of a Selective Encryption Scheme for the Security of Networked, Real-Time Video”, Proceedings of the Fourth International Conference on Computer Communications and Networks, IC3N'95, Sep. 20-23, 1995, Las Vegas, NV, pp. 2-10.
Srinivasan et al., “Windows Media Video 9: overview and applications”, Signal Processing: Image Communication, vol. 19, No. 9, Oct. 2004, 25 pgs.
Stockhammer, “Dynamic Adaptive Streaming over HTTP—Standards and Design Principles”, Proceedings of the second annual ACM conference on Multimedia, Feb. 2011, pp. 133-143.
Timmerer et al., “HTTP Streaming of MPEG Media”, Proceedings of Streaming Day, 2010, 4 pgs.
Tiphaigne et al., “A Video Package for Torch”, IDIAP Communication, IDIAP-COM 04-02, Jun. 2004, 46 pgs.
Trappe et al., “Key Management and Distribution for Secure Multimedia Multicast”, IEEE Transaction on Multimedia, vol. 5, No. 4, Dec. 2003, pp. 544-557.
Van Deursen et al., “On Media Delivery Protocols in the Web”, 2010 IEEE International Conference on Multimedia and Expo, Jul. 19-23, 2010, pp. 1028-1033.
Ventura, “Streaming of Multimedia Learning Objects”, AG Integrated Communication System, Thesis, Mar. 2003, 101 pgs.
Waggoner, “Compression for Great Digital Video: Power Tips, Techniques, & Common Sense”, CMP Books, 2002, 184 pgs.
Watanabem et al., “MPEG-2 decoder enables DTV trick plays”, esearcher System LSI Development Lab, Fujitsu Laboratories Ltd., Kawasaki, Japan, Jun. 2001, 2 pgs.
Wiegand, “Joint Video Team (JVT) of ISO/IEC MPEG and ITU-T VCEG”, Jan. 18, 2002, 70 pgs.
Willig et al., U.S. Appl. No. 61/409,285, filed Nov. 2, 2010, 43 pgs.
Yang et al., “Projection-Based Spatially Adaptive Reconstruction of Block-Transform Compressed Images”, IEEE Transactions on Image Processing, vol. 4, No. 7, Jul. 1995, pp. 896-908.
Yang et al., “Regularized Reconstruction to Reduce Blocking Artifacts of Block Discrete Cosine Transform Compressed Images”, IEEE Transactions on Circuits and Systems for Video Technology, vol. 3, No. 6, Dec. 1993, pp. 421-432.
Yu et al., “Video Deblocking with Fine-Grained Scalable Complexity for Embedded Mobile Computing”, Proceedings 7th International Conference on Signal Processing, Aug. 31-Sep. 4, 2004, pp. 1173-1178.
Zakhor, “Iterative Procedures for Reduction of Blocking Effects in Transform Image Coding”, IEEE Transactions on Circuits and Systems for Video Technology, vol. 2, No. 1, Mar. 1992, pp. 91-95.
Zambelli, “IIS Smooth Streaming Technical Overview”, Microsoft Corporation, Mar. 2009, 17 pages.
Related Publications (1)
Number Date Country
20210409839 A1 Dec 2021 US
Provisional Applications (1)
Number Date Country
61696095 Aug 2012 US
Continuations (2)
Number Date Country
Parent 15937715 Mar 2018 US
Child 17227026 US
Parent 13631017 Sep 2012 US
Child 15937715 US