[FFmpeg-user] Dynamic dvb subtitles

Carl Eugen Hoyos ceffmpeg at gmail.com
Thu Feb 21 01:34:34 EET 2019

2019-02-20 17:18 GMT+01:00, Felipe Mogollon <fmogollon at vicomtech.org>:
> Hi,
> I am trying to generate a mpegts stream with live DVB subtitles.
> I have managed to create DVB subtitles by doing some tricks with python +
> spumux + ffmpeg and I can finally get a dvbsub file that contains subtitles.
> If I mux dvbsubtitle file into a mpegts stream everything seems fine, just
> a little bit out of sync.
> ffmpeg  -re -f lavfi -i testsrc=size=1280x720:rate=30 -f mpegts -i
> dvbsub.sub -vcodec h264_nvenc -g 10 -scodec dvbsub -f mpegts output.ts -y
> My problem is when I try to generate live DVB subtitles:
> I have tried to put dvbsub.sub input in loop mode:
> ffmpeg  -re -f lavfi -i testsrc=size=1280x720:rate=30 -stream_loop -1 -i
> dvbsub.sub  -vcodec h264_nvenc -g 10 -acodec aac -strict -2 -scodec dvbsub
> -f mpegts output.ts -y
> and generate new dvbsub.sub for each "chunk" of subtitles, but ffmpeg
> doesn't seems to mux those new subtitles in the right way and "repeats" the
> first ones

This is what I would expect the option "-stream_loop" to do...

Carl Eugen

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