CA2306932A1 - Method and apparatus for implementing seamless playback of continuous media feeds - Google Patents

Method and apparatus for implementing seamless playback of continuous media feeds Download PDF

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Publication number
CA2306932A1
CA2306932A1 CA002306932A CA2306932A CA2306932A1 CA 2306932 A1 CA2306932 A1 CA 2306932A1 CA 002306932 A CA002306932 A CA 002306932A CA 2306932 A CA2306932 A CA 2306932A CA 2306932 A1 CA2306932 A1 CA 2306932A1
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Prior art keywords
file
series
data stream
digital data
satisfies
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CA002306932A
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French (fr)
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CA2306932C (en
Inventor
Daniel Weaver
David J. Pawson
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Thirdspace Living Ltd
NCube Corp
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Individual
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Priority to CA2606926A priority Critical patent/CA2606926C/en
Publication of CA2306932A1 publication Critical patent/CA2306932A1/en
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Classifications

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    • H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
    • H04N21/25—Management operations performed by the server for facilitating the content distribution or administrating data related to end-users or client devices, e.g. end-user or client device authentication, learning user preferences for recommending movies
    • H04N21/258—Client or end-user data management, e.g. managing client capabilities, user preferences or demographics, processing of multiple end-users preferences to derive collaborative data
    • H04N21/25808—Management of client data
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    • G11B27/02—Editing, e.g. varying the order of information signals recorded on, or reproduced from, record carriers
    • G11B27/031—Electronic editing of digitised analogue information signals, e.g. audio or video signals
    • G—PHYSICS
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    • G11B27/10—Indexing; Addressing; Timing or synchronising; Measuring tape travel
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Abstract

A method and system for storing a continuous feed of video is provided. According to one aspect of the invention, the continuous feed is encoded in a digital video format to produce a digital data stream. A series of content files is created by repeatedly performing the steps of (1) storing the digital data stream in a current file, and (2) establishing a new file as the current file when the current file satisfies a predetermined condition. If the series of content files contains more than a predetermined amount of the continuous feed, the oldest content file in the series of content files is deleted. Tag information that indicates information about frames contained in the digital data stream is generated. The tag information includes timestamps that indicate timing of frames relative to a beginning of the digital data stream. An initial time value that indicates an absolute time that corresponds to the beginning of the digital data stream. When a request from a client for playback beginning at a specified absolute time is received, the initial time value is subtracted from the specified absolute time to determine a relative time. The tag information is used to identify a location in the digital data stream that corresponds to the relative time. The digital data stream is then transmitted to the client beginning at the location in the digital data stream that corresponds to the relative time.

Claims (24)

1. A method for selectively storing portions of a continuous feed of video, the method including receiving at a server (106) a digital data stream produced by encoding said continuous feed in a digital video format, creating a series of content files (134) at said server (106) by repeatedly performing the steps of storing said digital data stream in a current file, and establishing a new file as said current file when said current file satisfies a predetermined condition, the method being characterized by:
supplying to a plurality of readers (122) information from said series of content files (134), wherein each reader (122) of said plurality of readers (122) is currently being supplied information from a corresponding position within said series of content files (134);
determining, without regard to positions of any readers (122) in said series of content files (134), whether said series of content files (134) satisfies a particular deletion condition;
if said series of content files (134) satisfies said particular deletion condition, then deleting a particular content file that satisfies a particular deletion criteria;
after determining that said series of content files (134) satisfies said particular deletion condition, and prior to deleting said particular content file, said server (106) performing the steps of determining whether any reader (122) of said plurality of readers (122) is currently playing information from said particular content file, and delaying the step of deleting if any reader (122) of said plurality of readers (122) is currently playing information from said particular content file.
2. The method of Claim 1 wherein the step of delaying is performed by delaying the step of deleting until either:
a predetermined period of time has elapsed; or no readers (122) are currently playing information from said particular content file.
3. The method of Claim 1 wherein the step of establishing a new file as said current file when said current file satisfies a predetermined condition includes the step of establishing a new file as said current file when said current file contains a predetermined amount of said continuous feed.
4. A method for storing a continuous feed of video, the method including receiving at a server (106) a digital data stream produced by encoding said continuous feed in a digital video format, creating a series of content files (134) at said server (106) by repeatedly performing the steps of storing said digital data stream in a current file and establishing a new file as said current file when said current file satisfies a predetermined condition, the method being characterized by:
determining whether said series of content files (134) satisfies a particular deletion condition;
if said series of content files (134) satisfies said particular deletion condition, then said server (106) performing the steps of deleting a particular content file that satisfies a particular deletion criteria; and preventing new readers (122) from beginning to access data from said particular content file in said series of content files (134).
5. The method of Claim 4 wherein the step of establishing a new file as said current file when said current file satisfies a predetermined condition includes the step of establishing a new file as said current file when said current file contains a predetermined amount of said continuous feed.
6. A method for storing a continuous feed of video, the method including receiving at a server (106) a digital data stream produced by encoding said continuous feed in a digital video format, the method being characterized by:
creating a series of content files (134) at said server (106) by repeatedly performing the steps of:
storing said digital data stream in a current file;

generating and storing tag information separate from said digital video stream that indicates information about frames contained in said digital data stream;
establishing a new file as said current file when sand current file satisfies a predetermined condition;
determining whether said series of content files (134) satisfies a particular deletion condition;
if said series of content files (134) satisfies said particular deletion condition, then deleting a particular content file that satisfies a particular deletion criteria.
7. The method of Claim 6 wherein the step of storing tag information includes the steps of:
generating a first header for a first tag file;
storing tag information sequentially in said first tag file;
when a set of tags within said first tag file becomes invalid, performing the steps of generating a second header for a second tag file;
copying all tags in said first tag file, except said set of tags, from said first tag file to said second tag file;
storing new tag information sequentially within said second tag file; and deleting said first tag file.
8. The method of Claim 7 wherein the step of deleting said first tag file comprises the step of renaming said second tag file with the name of said first tag file.
9. A method for providing non-sequential access to video from a continuous feed, the method including receiving at a server (106) a digital data stream produced by encoding said continuous feed in a digital video format, the method being characterized by:
generating, at said server (106), tag information that indicates information about frames contained in said digital data stream, said tag information including timestamps that indicate timing of frames relative to a beginning of said digital data stream;
storing an initial time value at said server (106) that indicates an absolute time that corresponds to said beginning of said digital data stream;

receiving a request from a client (122) for playback beginning at a specified absolute time;
subtracting said initial time value from said specified absolute time to determine a relative time;
using said tag information to identify a location in said digital data stream that corresponds to sand relative time; and transmitting said digital data stream to said client (122) beginning at said location in said digital data stream that corresponds to said relative time.
10. The method of Claim 9 wherein:
said server (106) uses a first precision timestamp when performing a sock or other non-sequential access; and said server (106) uses a second precision timestamp when transmitting content to a client (122), wherein the first precision is higher than said second precision.
11. A computer-readable medium having stored thereon sequences of instructions for selectively storing portions of a continuous feed of video, the method including receiving at a server (106) a digital data stream produced by encoding said continuous feed in a digital video format, creating a series of content files (134) at said server (106) by repeatedly performing the steps of storing said digital data, stream in a current file, and establishing a new file as said current file when said current file satisfies a predetermined condition, the computer-readable medium being characterized by instructions for performing the steps of:
supplying to a plurality of readers (122) information from said series of content files (134), wherein each reader (122) of said plurality of readers (122) is currently being supplied information from a corresponding position within said series of content files (134);
determining, without regard to positions of any readers (122) in said series of content files (134), whether said series of content files (134) satisfies a particular deletion condition;
if said series of content files (134) satisfies said particular deletion condition, then deleting a particular content file that satisfies a particular deletion criteria;

after determining that said series of content files (134) satisfies said particular deletion condition, and prior to deleting said particular content file, said server (106) performing the steps of determining whether any reader (122) of said plurality of readers (122) is currently playing information from said particular content file, and delaying the step of deleting if any reader (122) of said plurality of readers (122) is currently playing information from said particular content file.
12. The computer-readable medium of Claim 11 wherein the step of delaying is performed by delaying the step of deleting until either:
a predetermined period of time has elapsed; or no readers (122) are currently playing information from, said particular content file.
13. The computer-readable medium of Claim 11 wherein the step of establishing a new file as said current file when said current file satisfies a predetermined condition includes the step of establishing a new file as said current file when said current file contains a predetermined amount of said continuous feed.
14. A computer-readable medium having stored thereon sequences of instructions for storing a continuous feed of video, the computer-readable medium including instructions for receiving at a server (106) a digital data stream produced by encoding said continuous feed in a digital video format, creating a series of content files (134) at said server (106) by repeatedly performing the steps of storing said digital data stream is a current file and establishing a new file as said current file when said current file satisfies a predetermined condition, the computer-readable medium being characterized by instructions for performing the steps of:
determining whether said series of content files (134) satisfies a particular deletion condition;
if said series of content files (134) satisfies said particular deletion condition, then said server (106) performing the steps of deleting a particular content file that satisfies a particular deletion criteria; and preventing new readers (122) from beginning to access data from said particular content file in said series of content files (134).
15. The computer-readable medium of Claim 14 wherein the step of establishing a near file as said current file when said current file satisfies a predetermined condition includes the step of establishing a new file as said current file when said current file contains a predetermined amount of said continuous feed.
16. A computer-readable medium having stored thereon sequences of instructions for storing a continuous feed of video, the computer-readable medium including instructions for receiving at a server (106) a digital data stream produced by encoding said continuous feed in a digital video format, the computer-readable medium being characterized by instructions for performing the steps of:
creating a series of content files (134) at said server (106) by repeatedly performing the steps of:
storing said digital data stream in a current file;
generating and storing tag information separate from said digital video stream that indicates information about frames contained in said digital data stream;
establishing a new file as said current file when said current file satisfies a predetermined condition:
determining whether said series of content files (134) satisfies a particular deletion condition;
if said series of content files (134) satisfies said particular deletion condition, then deleting a particular content file that satisfies a particular deletion criteria.
17. The computer-readable medium of Claim 16 wherein the step of storing tag information includes the steps of:
generating a first header for a first tag file;
storing tag information sequentially in said first tag file;
when a set of tags within said first tag file becomes invalid, performing the steps of generating a second header for a second tag file;
copying all tags in said first tag file, except said set of tags, from said first tag file to said second tag file;
storing new tag information sequentially within said second tag file; and deleting said first tag file.
18. The computer-readable medium of Claim 17 wherein the step of deleting said first tag file comprises the step of renaming said second tag file over said first tag file.
19. A system for delivering a continuous feed of video, the system including one or more storage devices, a video server (106) that stores said continuous feed of video in a series of files on said one or more storage devices, the system being characterized by:
a threshold detection mechanism configured to detect when said series of files holds more than a predetermined threshold amount of said continuous feed; and an expiration mechanism that deletes a particular file of said series of flies in response to said threshold detection mechanism detecting that said series of files holds more than said predetermined threshold amount of said continuous feed;
wherein after detecting that said series of files holds more than said predetermined threshold amount of said continuous feed, and prior to deleting said particular file, said server (106) performing the steps of determining whether any reader (122) of a plurality of readers (122) is currently playing information from said particular file, and delaying the step of deleting if any reader (122) of said plurality of readers (122) is currently playing information from said particular file.
20. The system of Claim 19 wherein the step of deleting said particular file comprises the step of deleting an oldest file from said series of files.
21. A computer-readable medium having stored thereon sequences of instructions for providing non-sequential access to video from a continuous feed, the computer-readable medium including instructions for receiving at a server (106) a digital data stream produced by encoding said continuous feed in a digital video format, the computer-readable medium being characterized by instructions for performing the steps of:
generating, at said server (106), tag information that indicates information about frames contained in said digital data stream, said tag information including timestamps that indicate timing of frames relative to a beginning of said digital data stream;

storing an initial time value at said server (106) that indicates an absolute time that corresponds to said beginning of said digital data stream;
receiving a request from a client (122) for playback beginning at a specified absolute time;
subtracting said initial time value from said specified absolute time to determine a relative time;
using said tag information to identify a location in said digital data stream that corresponds to said relative time; and transmitting said digital data stream to said client (122) beginning at said location in said digital data stream that corresponds to said relative time..
22. The computer-readable medium of Claim 21 wherein:
said digital data stream includes timestamp values having a first precision;
and said step of generating tag information includes generating timestamp values that have a second precision, wherein said second precision is higher than said first precision.
23. The method of Claim 6 wherein the step of establishing a new file as said current file when said current file satisfies a predetermined condition includes the step of establishing a new file as said current file when said current file contains a second amount of said continuous feed.
24. The computer-readable medium of Claim 16 wherein the step of establishing a new file as said current file when said current file satisfies a predetermined condition includes the step of establishing a new file as said current file when said current file contains a predetermined amount of said continuous feed.
CA2306932A 1997-10-22 1998-10-19 Method and apparatus for implementing seamless playback of continuous media feeds Expired - Lifetime CA2306932C (en)

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US08/956,262 US6138147A (en) 1995-07-14 1997-10-22 Method and apparatus for implementing seamless playback of continuous media feeds
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