Media server system and method having improved asset types for playback of digital media

• US 6,498,897 B1
• Filed: 05/27/1998
• Issued: 12/24/2002
• Est. Priority Date: 05/27/1998
• Status: Expired due to Term

• Current Assignee: Espial Incorporated (Enghouse Systems Limited)
• Original Assignee: Kasenna, Inc. (Enghouse Systems Limited)
• Inventors: Gunaseelan, Lakshminarayanan, Nelson, Michael N.
• Primary Examiner(s): Chevalier, Robert
• Application Number:
  US09/085,565
• Time in Patent Office: 1,672 Days
• Field of Search: H04/N.726, H04/N.585, H04/N.591, 386/125, 386/68, 386/69, 386/67, 386/46, 386/109, 386/111, 386/112, 386/6, 386/7, 386/1, 386/45, 386/126, 386/70, 386/83, 386/27, 386/33, 386/124, 360/32
• US Class Current: 386/243
• CPC Class Codes: H04N 21/23439 for generating different versions
• CPC Class Codes: H04N 21/4344 Remultiplexing of multiplex streams, e.g. by modifying time stamps or remapping the packet identifiers
• CPC Class Codes: H04N 21/4345 Extraction or processing of SI, e.g. extracting service information from an MPEG stream
• CPC Class Codes: H04N 21/4516 involving client characteristics, e.g. Set-Top-Box type, software version or amount of memory available
• CPC Class Codes: H04N 21/454 Content or additional data filtering, e.g. blocking advertisements
• CPC Class Codes: H04N 21/84 Generation or processing of descriptive data, e.g. content descriptors systems specially adapted for using meta-information in broadcast systems H04H60/73
• CPC Class Codes: H04N 7/52 Systems for transmission of a pulse code modulated video signal with one or more other pulse code modulated signals, e.g. an audio signal or a synchronizing signal assembling of a multiplex stream by combining a video stream with other content or additional data, remultiplexing of multiplex streams, insertion of stuffing bits into the multiplex stream, assembling of a packetised elementary stream at server side H04N21/236; disassembling of a multiplex stream, remultiplexing of multiplex streams, extraction or processing of Service Information, disassembling of packetised elementary stream at client side H04N21/434

Abstract

A media server system and method are disclosed for playback of digital media. For playback, header information associated with a complex asset is received. The header information comprises information for initializing a decoder (56) for playback of the complex asset. Artificial headers (54) for the complex asset are then created using the header information. A digital packet stream for the complex asset is received and passed decoder (56) for playback. During playback, artificial headers (54) are injected as appropriate for initializing the decoder (56) for playback of the complex asset. In one implementation, the complex asset can be a clip asset (100), a parallel asset (102), a sequential asset (106) or a composite asset (110).

Claims

1. A method for playback of a media file from a media server, comprising:

receiving header information associated with a complex asset, said complex asset comprising a subset or combination of single bitstream assets, the header information comprising information for initializing a decoder for playback of the complex asset;

creating artificial headers, characterized in that said artificial headers are separated from said media file, for the complex asset using the header information;

receiving a digital packet stream for the complex asset and passing the digital packet stream to the decoder for playback; and

injecting artificial headers during playback as appropriate for initializing the decoder for playback of the complex asset.

2. The method of claim 1, wherein the complex asset comprises a clip asset.

3. The method of claim 1, wherein the complex asset comprises a parallel asset.

4. The method of claim 1, wherein the complex asset comprises a sequential asset.

5. The method of claim 1, wherein the complex asset comprises a composite asset.

6. The method of claim 1, further comprising:

storing the artificial headers;

monitoring error conditions in the decoder during playback; and

if there is a decoder shutdown, re-injecting the artificial headers as appropriate for initializing the decoder for playback of the complex asset.

7. The method of claim 1, wherein the header information and the digital packet stream are received across a local area network.

8. The method of claim 1, wherein the header information and the digital packet stream are received across the Internet.

9. The method of claim 1, wherein said digital packet stream is received from a storage device.

10. The method of claim 1, wherein said digital packet stream is received from a live feed.

11. The method of claim 1, wherein said header information is received from a database.

12. The method of claim 1, wherein the complex asset comprises a composite asset and said composite asset comprises:

a name uniquely identifying the composite asset;

a first associated asset encoding a media title in a first format; and

a second associated asset encoding the media title in a second, different format; and

said method further comprises;

invoking a process on said media server to obtain format information for said composite asset;

receiving a list of formats for the composite asset;

discarding the formats that exceed an available bit rate;

selecting, from remaining formats, a format and player combination that has a highest priority; and

launching the selected player to playback a selected associated asset in said selected format.

13. The method of claim 12, wherein the format information comprises a list of tuples each holding a name, a format and a bit rate for one of the first or second associated assets.

14. The method of claim 12, wherein said launching further comprises requesting the selected associated asset from the media server.

15. The method of claim 12, wherein the first format is MPEG-1 and the second format is MPEG-2.

16. A computer program product comprising a media control application capable of directing a client system to:

receive header information associated with a complex asset, the header information comprising information for initializing a decoder for playback of the complex asset;

create artificial headers for the complex asset using the header information, the artificial headers characterized in that they are separate from a media file with which the header is typically located;

receive a digital packet stream for the complex asset and passing the digital packet stream to the decoder for playback; and

inject artificial headers during playback as appropriate for initializing the decider for playback of the complex asset.