[FFmpeg-devel] [PATCH] added parameter to dash encoder for start available time

[Gyan Doshi]

On 2021-03-18 20:12, Jan Ekström wrote:
> So right now we do have an option in ffmpeg.c called itsoffset. It
> lets you configure the input offset in time (seconds - such as
> "1337.123" or time format - such as "00:00:01.123"). The only problem
> with it right now is that unless you set -copyts it will not get
> applied for anything else than subtitles, as the offset gets applied
> before and is not taken into account in the "start from PTS 0"
> calculation for video/audio streams.

Not the case.

     ffmpeg -f lavfi -itsoffset 3 -i nullsrc=r=1:d=3 -vf showinfo -f null -

gives

[Parsed_showinfo_0 @ 0000019cc1b88540] n:   0 pts:      3 pts_time:3   ...
[Parsed_showinfo_0 @ 0000019cc1b88540] n:   1 pts:      4 pts_time:4   ...
[Parsed_showinfo_0 @ 0000019cc1b88540] n:   2 pts:      5 pts_time:5   ...

I've used it many times to adjust sync among streams.

Regards,
Gyan