Digital closed caption transport in standalone stream
View Patent ↗A method and system for digital closed caption transport are provided. In one example, the method involves receiving closed caption data and a program feed having video content, embedding the closed caption data into a standard video syntax, and encoding the video content into the standard video syntax as a background, wherein the closed caption data and the video content are encoded into a closed caption program feed.
1. A method of closed caption transport, the method comprising:
receiving closed caption data and a program feed having video content;
embedding the closed caption data into a standard video syntax; and
encoding the video content into the standard video syntax as a background, wherein the closed caption data and the video content are encoded into a closed caption program feed, wherein I-pictures carry desired background information, wherein if the background for captions is configured to appear as gray, then the video content is encoded as (PPPPPP . . . ), and if the background is a color other than gray, the video content is encoded as (IPPPPP . . . IPPPPP . . . IPPPPP).
2. The method of claim 1 , wherein the background is gray.
3. The method of claim 1 , wherein the method complies with a United States digital television standard on closed caption carriage in digital multiplexes, wherein the method is ubiquitously applicable to current and future generation video streams.
4. The method of claim 3 , wherein the United States digital television standard is at least one of:
CEA-608-B;
CEA-708-B; and
SCTE 20.
5. The method of claim 1 , wherein the standard video syntax complies with a standard codec including at least one of:
MPEG-2;
MPEG-4;
H.264; and
Microsoft® VC-1.
6. The method of claim 1 , wherein the program feed is at least one of:
audio only;
no audio and video;
still picture; and
low_delay mode.
7. The method of claim 1 , wherein the closed caption program feed is a group of pictures, wherein each picture of the group of pictures is encoded as “sequence-header, sequence-extension, picture-header, picture-user-data with captions”, wherein random access is possible at each picture.
8. The method of claim 7 , wherein the encoding of the video content does not include encoding of B-pictures.
9. The method of claim 1 , wherein the closed caption program feed is configured to be acquired at each picture, wherein if acquisition of a picture is made at a P picture the background is configured to be gray until an I picture is received.
10. The method of claim 1 , wherein the program feed includes still video, wherein the I-pictures represent still video frames, wherein between consecutive I pictures is a sufficient number P pictures such that a frame rate of the closed caption program feed remains substantially constant.
11. The method of claim 1 , wherein the program feed includes still video, wherein the I-pictures represent still video frames, wherein between consecutive I pictures are P pictures to fill missing pictures between coded pictures and to keep a frame of the closed caption program feed substantially constant.
12. An encoder for closed caption transport, the encoder comprising:
a receiving device configured to receive closed caption data and a program feed having video content;
an embedding device configured to embed the closed caption data into a standard video syntax; and
an encoding device configured to encode the video content into the standard video syntax as a background, wherein the closed caption data and the video content are encoded into a closed caption program feed, wherein if the background for captions is configured to appear as gray, then the video content is encoded as (PPPPPP . . . ), and if the background is a color other than gray, the video content is encoded as (IPPPPP . . . IPPPPP . . . IPPPPP), and further wherein I-pictures carry desired background information.
13. The encoder of claim 12 , wherein the background is gray.
14. The encoder of claim 12 , wherein the encoder complies with a United States digital television standard on closed caption carriage in digital multiplexes, wherein the encoder is ubiquitously applicable to current and future generation video streams.
15. The encoder of claim 14 , wherein the United States digital television standard is at least one of:
CEA-608-B;
CEA-708-B; and
SCTE 20.
16. The encoder of claim 12 , wherein the standard video syntax complies with a standard codec including at least one of:
MPEG-2;
MPEG-4;
H.264; and
Microsoft® VC-1.
17. The encoder of claim 12 , wherein the program feed is at least one of:
audio only;
no audio and video;
still picture; and
low_delay mode.
18. The encoder of claim 12 , wherein the closed caption program feed is a group of pictures, wherein each picture of the group of pictures is encoded as “sequence-header, sequence-extension, picture-header, picture-user-data with captions”, wherein random access is possible at each picture.
19. The encoder of claim 18 , wherein the encoding of the video content does not include encoding of B-pictures.
20. The encoder of claim 12 , wherein the closed caption program feed is configured to be acquired at each picture, wherein if acquisition of a picture is made at a P picture the background is configured to be gray until an I picture is received.
21. The encoder of claim 12 , wherein the program feed includes still video, wherein the I-pictures represent still video frames, wherein between consecutive I pictures is a sufficient number P pictures such that a frame rate of the closed caption program feed remains substantially constant.
22. The encoder of claim 12 , wherein the program feed includes still video, wherein the I-pictures represent still video frames, wherein between consecutive I pictures are P pictures to fill missing pictures between coded pictures and to keep a frame of the closed caption program feed substantially constant.
23. A non-transitory computer-readable medium storing one or more instructions for a method of closed caption transport, wherein the one or more instructions, when executed by one or more processors, cause the one or more processors to perform:
receiving closed caption data and a program feed having video content;
embedding the closed caption data into a standard video syntax; and
encoding the video content into the standard video syntax as a background including substituting all-black pictures for original coded frames in real time, wherein the closed caption data and the video content are encoded into a closed caption program feed, wherein if the background for captions is configured to appear as gray, then the video content is encoded as (PPPPPP . . . ), and if the background is a color other than gray, the video content is encoded as (IPPPPP . . . IPPPPP . . . IPPPPP), and further wherein I-pictures carry desired background information.