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I am trying to embed closed captioning into my .mp4. I already have an .srt file with my subtitles and timing and have been trying iterations of the following:

ffmpeg -i [source file].mp4 -i [source file].srt -c:v copy -c:a copy -c:s mov_text -metadata:s:s:0 language=eng [output file].mp4

This does provide me with an .mp4 that has optional subtitles when playing in QuickTime and VLC, but when I play the file on a television and push the CC button on the remote, it says there is no closed captioning available.

I am totally new to closed captions and really have no idea about pretty much any of it. Any help would be very greatly appreciated please!

Thanks

rwwilkinson
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    There are many different caption formats. mov_text is not 708. Ffmpeg, I believe, does not have a 608/708 encoder. There is an open source project I made named libcaption (google it) that I made that may be what you are looking for. – szatmary Nov 06 '17 at 23:28

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