[FFmpeg-user] Copy DVB subtitles

[Mitja Pirih]

On 28. 12. 2015 12:30, Mitja Pirih wrote:
> Hi,
>
> I am trying to copy dvb subtitles from a multicast stream to a rtmp
> stream (flv container). I am probably doing something wrong or maybe the
> container does not accept dvb_subtitles format? I can't find anything
> usable in docs.
>
> I've got this:
> Stream #0:0[0xc7]: Video: mpeg2video (Main) ([2][0][0][0] / 0x0002),
> yuv420p(tv), 720x576 [SAR 64:45 DAR 16:9], max. 15000 kb/s, 25 fps, 25
> tbr, 90k tbn, 50 tbc
> Stream #0:1[0xc8]: Audio: mp2 ([3][0][0][0] / 0x0003), 48000 Hz, stereo,
> s16p, 192 kb/s
> Stream #0:2[0xcb](slv): Subtitle: dvb_subtitle ([6][0][0][0] / 0x0006)
> Stream #0:3[0xcc](mac): Subtitle: dvb_subtitle ([6][0][0][0] / 0x0006)
>
> I am trying to copy subtitles to a rtmp stream: -c:v copy -c:a copy
> -scodec copy -f flv rtmp://localhost:1935/test/stream1
> What I get is this error:
> Could not write header for output file #0 (incorrect codec parameters
> ?): Invalid data found when processing input
>
> If I use something like this: -c:v copy -c:a copy -scodec copy output.ts
> it works as expected. So I suppose what I am trying to do is not
> compatible with flv. What options do I have?
>
>
> Thanks.

It looks like I can "Burn-in" the subtitles and I actually managed to do
that, following this guide:
https://trac.ffmpeg.org/wiki/HowToBurnSubtitlesIntoVideo
But, my question remains, is it possible to send subtitles in a rtmp stream?

Thanks.