MEDIA STREAMING USING AN INDEX FILE

• US 20090300204A1
• 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, Folta, Florin, Smirnov, Serge, Zhang, Wenbo, Musayev, Eldar, Kotteri, Kishore
• Granted Patent: US 7,925,774 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 substantially glitch-free experience. The system adapts the media stream to the user connection in order to choose the most desirable stream to avoid glitches. For example, in the case where there is interference (e.g., a microwave being used near a wireless device), the quality of the media stream is lowered. In one embodiment, an index file is used to make logical decisions about which media stream to choose in order to minimize glitches. The index file can take different forms, but, generally, includes characteristics about the available media streams. Example characteristics include the bit rates of the media streams and quality information about the media streams.

Claims

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

using an index file that describes characteristics of a media stream to make logical decisions about which bit rate for the media stream to choose in order to minimize glitches when the chosen media stream is rendered on the playback device;

receiving the chosen media stream from the network; and

rendering the chosen media stream on the playback device with minimized glitches.

2. The method of claim 1, wherein characteristics described include the bit rate, fragment numbers, duration for fragments of the media streams, and network addresses of the media streams.

3. The method of claim 1, wherein the different bit rates for the media stream include separate bit rates for audio and video.

4. The method of claim 1, wherein the media stream is divided into fragments of substantially equal time duration.

5. The method of claim 4, wherein the index file describes at least one of the following characteristics of the media stream:

the bit rate, the duration of the fragments, and the quality of the fragments.

6. The method of claim 1, wherein the index file includes attributes used in a media pipeline in decoding the media stream.

7. The method of claim 1, further including encoding the media stream on a server computer and generating the index file on the server that defines the media stream as having multiple logical or actual entry points.

8. 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.

9. The method of claim 1, wherein the bit rates for the media stream are at substantially constant bit rates or variable bit rates.

10. The method of claim 1, wherein making logical decisions includes adapting to a network bandwidth or adapting to an ability to render on the playback device.

11. The method of claim 1, wherein making logical decisions includes using a heuristics module to monitor buffer levels and modifying the bit rate based on the buffer levels.

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

generating a media stream at multiple bit rates using an encoder on a server computer;

wherein the media stream is segmented with logical or actual entry points; and

generating an index on the server computer describing the bit rates and segments.

13. The method of claim 12, wherein each media stream at a different bit rate includes identical content but at varying levels of quality.

14. The method of claim 12, wherein the bit rates are constant or variable.

15. The method of claim 12, wherein the media stream is divided into fragments of a substantially fixed duration.

16. A method of displaying content, comprising:

receiving a request on a playback device to view a media stream;

in response to the request, retrieving an index file describing fragments of the media stream and different bit rates available for the media stream; and

using the index file to make decisions about which bit rate associated with the media stream to use.

17. The method of claim 16, wherein the index file includes quality information associated with the fragments.

18. The method of claim 16, wherein the bit rates are constant or variable bit rates.

19. The method of claim 16, wherein the index file provides the duration of the fragments.

20. The method of claim 16, wherein the decisions are made to minimize glitches on the playback device.