support scc file of closed captioning data

[dave rice]

Summary of the bug:

Starting a ticket based on ​http://ffmpeg.org/pipermail/ffmpeg-user/2015-August/027836.html to support muxing scc files into supportive formats. I'm attaching an scc files and a corresponding srt files. The scc files contains some information that the srt doesn't, such as the placement coordinates and commands to rollup text, clear line, delete, etc.

[dave rice]

scc file

[dave rice]

srt file (same content as scc file)

[Marcelo Naumann Boufleur]

Newer version of SRT file, with fixes to Subrip syntax, and proper Timecode conversion from the SCC version.

[Elon Musk]

Implemented in 45ff6ef50e2ada0c473ee662f84957186e06a232.

[François]

Hi,

Does it mean that it is possible to extract SCC files from videos, for example using the following syntax ?

ffmpeg -f lavfi -i movie=ESPN_rtp.ts[out+subcc] -map 0:1 coucou.scc

I obtain the following message when I try: Unable to find a suitable output format for 'coucou.scc'

The same command works great with .srt output.

Do I have to enable a particular flag at compilation time ?

Thanks,

François

[Elon Musk]

It would be easy to write scc muxer, but not ccaption encoder.

[dave rice]

A scc muxer would be helpful for outputting a scc file from the output of the readeia608 filter. There are also encoded scc style captions in DV files and QuickTime c608 tracks so having a scc muxer could make this data a lot more accessible.

[Elon Musk]

I need more files with closed captions embedded into video stream.
Because there is some nuisances with one file I already have.

[François]

You can find plenty of them here: ​http://ccextractor.org/doku.php?id=public:general:tvsamples

[Elon Musk]

Is there any tool that can already create reasonable scc files?

I wonder where to start and where to stop subtitle lines.

[unsword]

An SCC Muxer was added with this commit:

​https://git.ffmpeg.org/gitweb/ffmpeg.git/commit/036e12b225b2869861d1449534dec94bd491559e

This command will now create a .scc file from source media containing EIA-608 Caption Data in userdata

ffmpeg.exe -f lavfi -i movie="CC_TEST001.mpg[out+subcc]" -map 0:1 -c:s copy T:\temp\output.scc

This provides creation of .scc from media containing captioning which is what this ticket morphed into.

The original request still exists to provide ability to use a .scc file as a source for inserting EIA-608 captioning as A/53 in MPEG-2 and x264 as well as 436M Ancillary Data of MXF files