MEDIA STREAMING WITH ENHANCED SEEK OPERATION

• US 20090297123A1
• 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, Zhang, Wenbo, Musayev, Eldar
• Granted Patent: US 8,370,887 B2
• Time in Patent Office: Days
• US Class Current: 386/241
• 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. The media stream is available from the network at multiple bit rates. When a seek operation is performed, a playback device requests a lower bit rate media stream in order to quickly fill a playback buffer so that playback can commence more readily. After a seek start-up period is complete, the playback device can return to downloading the media stream associated with higher bit rates in order to increase the quality of the playback.

Claims

1. A method for performing a seek operation in a media stream displayed on a playback device, comprising:

receiving a media stream from a network, the media stream being associated with a first bit rate;

receiving a user request to seek to a new location in the media stream;

in response to the user request, downloading the media stream, associated with a second bit rate that is less than the first bit rate, from substantially the new location to ensure fast start-up; and

rendering the media stream starting at the new location.

2. The method of claim 1, further including ramping-up the bit rate of the media stream after the fast start-up based on a previously stored network bandwidth.

3. The method of claim 1, wherein the media stream is available from a server computer coupled to the playback device at multiple bit rates.

4. The method of claim 1, further including displaying an indicator of a current point in the media segment being displayed and displaying thumbnail photos as seek points that can be selected.

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

6. The method of claim 1, further including generating a network address for the new location using an index file associated with the media stream.

7. The method of claim 1, wherein the media stream includes 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 first and second bit rates for the media stream are at substantially constant bit rates or variable bit rates.

10. A method for performing a seek operation, comprising:

receiving a media segment, associated with a first bit rate, from a network;

displaying the media segment including a location indicator showing a current time point being viewed in the media segment;

receiving a request to view the media segment from a second time point that is different than the current time point; and

receiving the media segment, associated with a second bit rate that is lower than the first bit rate, from the network for rendering from the second time point to ensure fast start-up for viewing the media segment.

11. The method of claim 10, wherein the request to view the media segment from the second time point is in response to a user drag-and-drop operation on the location indicator.

12. The method of claim 10, further including returning to receiving the media segment associated with the first bit rate from the network after the start-up is completed.

13. The method of claim 10, wherein the network is the Internet.

14. The method of claim 10, wherein the media segment is divided into fragments and the second time point is a start of a fragment;

and further including switching to a higher bit rate after the fragment associated with the second time point is received.

15. A method for performing a seek operation, comprising:

receiving a media segment to display from a network, wherein the media segment comprises at least multiple sequential media fragments encoded at a first bit rate;

displaying the media segment by displaying the fragments sequentially in association with a location indicator showing a current point being viewed in the media segment;

receiving a seek request to view the media segment from a second, different point;

generating a network address associated with the second point;

requesting, from a server computer, a next fragment in the media segment that is encoded at a second bit rate, different than the first bit rate, the next fragment being at the generated network address; and

after a period of time, returning to receiving the fragments associated with the media segment that are encoded at the first bit rate or another bit rate higher than the second bit rate.

16. The method of claim 15, wherein generating the network address includes using an index file that associates location in the media segment to time to generate a fragment number.

17. The method of claim 15, wherein a heuristics module determines which bit rate to download from the network.

18. The method of claim 15, wherein the media segment is available on the network at multiple bit rates and the bit rates are constant or variable.

19. The method of claim 17, wherein the heuristics module is in a plug-in to a browser.

20. The method of claim 15, further including displaying the location indicator with thumbnails representing points that can be jumped to in the media segment.