STREAM SELECTION FOR ENHANCED MEDIA STREAMING

• US 20090300203A1
• Filed: 08/07/2008
• Published: 12/03/2009
• Est. Priority Date: 05/30/2008
• Status: Active Grant

• Current Assignee: Zhigu Holdings Limited
• Original Assignee: Microsoft Corporation
• Inventors: Virdi, Gurpratap, Vega-Garcia, Andres, Smirnov, Serge, Zhang, Wenbo, Musayev, Eldar
• Granted Patent: US 7,949,775 B2
• Time in Patent Office: Days
• US Class Current: 709/231
• CPC Class Codes: H04L 65/60 Network streaming of media packets
• CPC Class Codes: H04N 21/2358 for generating different versions, e.g. for different recipient devices
• CPC Class Codes: H04N 21/4325 by playing back content from the storage medium reproduction of recorded television signals H04N5/76; reproduction of recorded television signals H04N9/79
• CPC Class Codes: H04N 21/44004 involving video buffer management, e.g. video decoder buffer or video display buffer
• CPC Class Codes: H04N 21/6373 for rate control , e.g. request to the server to modify its transmission rate flow control in packet networks H04L47/10
• CPC Class Codes: H04N 9/8227 the additional signal being at least another television signal

Abstract

The present disclosure relates to playback of video/audio streaming media data to provide a glitch-free experience. The system adapts the media stream to the user connection in order to provide the glitch-free experience. Stream selection can be made using a heuristics module located on the playback device that analyzes various aspects of the playback to make intelligent decisions about which media stream to download from a network.

Claims

1. A method of rendering a media stream on a playback device, comprising:

dynamically analyzing playback criteria while rendering the media stream;

based on the analysis, determining, in the playback device, which of multiple available media streams to retrieve from a network in order to minimize glitches during the playback;

retrieving the determined media stream from the network; and

rendering the media stream with minimized glitching.

2. The method of claim 1, wherein the playback criteria includes a buffer level used during playback or a quality measurement of a segment.

3. The method of claim 2, wherein the buffer level relates to a number of bytes in a buffer or an amount of time remaining in the buffer to playback.

4. The method of claim 1, wherein the multiple media streams include the same content but at different bit rates.

5. The method of claim 4, wherein the different bit rates are constant bit rates or variable bit rates.

6. The method of claim 1, wherein the playback device includes one of the following:

a computer, a mobile phone, a gaming console, and a television; and

wherein the network is the Internet.

7. The method of claim 1, wherein the media stream is divided into fragments of a specified time duration.

8. The method of claim 1, wherein the dynamic analysis occurs in a download management program that is a plug-in to a browser and that is dynamically loaded each time a website is accessed.

9. The method of claim 1, wherein the playback criteria includes analyzing empirical data obtained during the playback.

10. The method of claim 9, wherein the empirical data includes current and historical network bandwidths.

11. The method of claim 9, wherein the empirical data includes a speed with which the playback device displays content.

12. A method of rendering a media stream on a playback device, comprising:

selecting, from the playback device, a bit rate associated with the media stream to download from a network;

storing the media stream in a buffer on the playback device;

monitoring a buffer level of data stored in the buffer; and

modifying, in the playback device, the selected bit rate to download based on the buffer level in order to minimize glitches in rendering the media stream.

13. The method of claim 12, wherein the buffer level has predetermined high and low limits that are used in modifying the selected bit rate.

14. The method of claim 12, wherein the buffer level relates to a number of bytes in a buffer or an amount of time remaining in the buffer to playback.

15. The method of claim 12, further including monitoring the quality level and using the quality level to select the bit rate.

16. A method of rendering a media stream on a playback device, comprising:

selecting, from the playback device, a bit rate associated with a media stream to download from a network;

rendering the media stream on the playback device;

monitoring a rate at which the media stream is being rendered;

modifying the bit rate downloaded from the network based on the monitored rate at which the media stream is being rendered.

17. The method of claim 16, wherein modifying the bit rate includes lowering the bit rate if the rate at which the media stream is rendered falls below a predetermined threshold.

18. The method of claim 16, further including replacing content already downloaded with the same content downloaded at a lower bit rate.

19. The method of claim 16, wherein monitoring includes using a quality manager to monitor a number of frames that a media pipeline in the playback device is rendering.

20. The method of claim 16, further including selecting a new bit rate by using an intersection point between a bit rate selected by a network heuristics module and a resource heuristics module.