[FFmpeg-user] Dynamic dvb subtitles

[Felipe Mogollon]

So, is there any way to do what I am trying?

I mean, I want to push new dvbsub subtitles in a live mpegts

Felipe



On Thu, Feb 21, 2019 at 12:34 AM Carl Eugen Hoyos <ceffmpeg at gmail.com>
wrote:

> 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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Juan Felipe Mogollón Rodríguez
Researcher | Investigador
Digital Media
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