Signalling buffer characteristics for splicing operations of video streams

• US 8,949,883 B2
• Filed: 05/12/2010
• Issued: 02/03/2015
• Est. Priority Date: 05/12/2009
• Status: Active Grant

• Current Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Original Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Inventors: Rodriguez, Arturo A., Beheydt, Samie, De Lameillieure, Jan Louis, Au, James Ka Sin
• Primary Examiner(s): Patel, Jay Au
• Assistant Examiner(s): Aghevli, Reza
• Application Number:
  US12/779,035
• Publication Number:
  US 20100293571A1
• Time in Patent Office: 1,728 Days
• US Class Current: 725/32
• CPC Class Codes: H04L 65/61 for supporting one-way streaming services, e.g. Internet radio
• CPC Class Codes: H04L 65/70 Media network packetisation
• CPC Class Codes: H04L 65/75 Media network packet handling
• CPC Class Codes: H04L 65/756 adapting media to device capabilities
• CPC Class Codes: H04N 21/23424 involving splicing one content stream with another content stream, e.g. for inserting or substituting an advertisement
• CPC Class Codes: H04N 21/44016 involving splicing one content stream with another content stream, e.g. for substituting a video clip

Abstract

In one method embodiments, providing a transport stream to a client device, the transport stream comprising a head stream and a tail stream, the head stream and the tail stream each comprising a compressed video sequence; providing information in a transport stream packet associated with the head stream, the information configured to cause the client device to selectively control an output of at least one of a plurality of pictures of the head stream yet to be output from a decoded picture buffer (DPB) at an out-point from the head stream to the trail stream.

Claims

1. A method, comprising:

providing a transport stream to a splicing device, the transport stream comprising a head stream concatenated to a tail stream, the head stream and the tail stream each comprising a compressed video sequence from a separate video source; and

providing in an adaptation field of a transport stream packet corresponding to the head stream a splice out-point that corresponds to a splice point, the splice point provided based on presentation time stamp (PTS) value, the splice out-point signaled by a descriptor in a program map table (PMT), the transport packet further comprising assistive information comprising one or more compressed picture buffer (CPB) properties and one or more decoded picture buffer (DPB) properties that are used in the concatenation of the head stream and the tail stream, wherein the CPB properties comprises at least an Advanced Video Coding level, wherein the DPB properties comprise;

a first flag corresponding to a last PTS value corresponding to a last picture in the DPB; and

a second flag, the second flag signaling that all of the plurality of pictures yet to be output residing in the DPB have successive picture output times; and

the second flag further signals that a first output time of the yet to be output pictures is a first frame interval after the splice out-point.

2. The method of claim 1, wherein the provided splice point is provided according to a message compliant with Society of Cable and Telecommunications Engineers Standard 35—

Digital Program Insertion Cueing Message for Cable.

3. The method of claim 1, wherein the transport packet is located immediately prior to the splice out-point connecting the head stream to the tail stream.

4. The method of claim 1, wherein the descriptor comprises an elementary stream (ES) descriptor loop of the PMT.

5. The method of claim 1, wherein the CPB properties further comprises a value corresponding to a decoded time stamp (DTS) value minus a system time clock (STC) value.

6. The method of claim 1, wherein the CPB properties further comprises a value corresponding to a decoded time stamp (DTS) value minus a system time clock (STC) value and a buffer level.

7. The method of claim 1, wherein the CPB properties further comprises a value corresponding to a decoded time stamp (DTS) value minus a system time clock (STC) value, a buffer level, and an intended CPB upper bound level and CPB lower bound level.

8. The method of claim 1, further comprising honoring at the splicing device a yet to be output picture (YTBOP) interval at the splice out-point and a splice in-point, the splice in-point corresponding to the splice in point connecting the tail stream to the head stream.

9. The method of claim 1, wherein responsive to a no_ouput_of_prior_pics_flag_value equal to one (1), outputting at the splicing device pictures equal to a value corresponding to a last_PTS flag provided in the assistive information while filling a CPB.

10. The method of claim 9, wherein outputting the pictures comprises repeating a last picture output prior to the splice out-point.

11. The method of claim 9, wherein outputting the pictures comprises repeating outputting blank pictures.

12. The method of claim 11, wherein the splicing device is located in a subscriber television system.

13. A splicing device, comprising:

a processor configured to;

receive a transport stream, the transport stream comprising a head stream concatenated to a tail stream, the head stream and the tail stream each comprising a compressed video sequence from a separate video source; and

receive in an adaptation field of a transport stream packet corresponding to the head stream a splice out-point that corresponds to a provided splice point, the splice point provided based on presentation time stamp (PTS) value, the splice out-point signaled by a descriptor in a program map table (PMT), the transport packet further comprising assistive information comprising one or more compressed picture buffer (CPB) properties and one or more decoded picture buffer (DPB) properties that are used in the concatenation of the head stream and the tail stream, wherein the CPB properties comprises at least an Advanced Video Coding level, wherein the DPB properties comprise;

a first flag corresponding to a last PTS value corresponding to a last picture in the DPB; and

a second flag, the second flag signaling that all of the plurality of pictures yet to be output residing in the DPB have successive picture output times; and

the second flag further signals that a first output time of the yet to be output pictures is a first frame interval after the splice out-point.

14. The splicing device of claim 13, wherein the CPB properties further comprises one or more of a value corresponding to a decoded time stamp (DTS) value minus a system time clock (STC) value, a buffer level, and an intended CPB upper bound level and CPB lower bound level.

15. The splicing device of claim 13, wherein the DPB properties comprises a first flag corresponding to a last PTS value corresponding to a last picture in the DPB and a second flag, the second flag signaling that all of the plurality of pictures yet to be output residing in the DPB have successive picture output times.

16. A computing device, comprising:

a processor configured to;

provide a transport stream to a client device, the transport stream comprising a head stream and a tail stream, the head stream and the tail stream each comprising a compressed video sequence from a separate video source; and

provide information in a transport stream packet associated with the head stream, the information configured to cause the client device to selectively control an output of at least one of a plurality of pictures of the head stream yet to be output from a decoded picture buffer (DPB) at a splice out-point from the head stream to the trail stream, the splice out-point signaled by a descriptor in a program map table (PMT), wherein the CPB properties comprises at least an Advanced Video Coding level, wherein the DPB properties comprise;

a first flag corresponding to a last PTS value corresponding to a last picture in the DPB; and

a second flag, the second flag signaling that all of the plurality of pictures yet to be output residing in the DPB have successive picture output times; and

the second flag further signals that a first output time of the yet to be output pictures is a first frame interval after the splice out-point.