[Libav-user] AV_SEEK_FRAME failing for compressed formats like .wmv .mp4
ggarra13 at gmail.com
Tue Jul 31 19:58:15 EEST 2018
El 31/07/18 a las 04:16, ganesh mundhe escribió:
> Hello all,
> I have been trying to decode videos where I need to offset start position.
> I have tried to use AV_seek_frame but it works on raw video format
> (.y4m) but fails on mpeg2 compressed formats.
> Generally videos are in mp4 or wmv and I need to write for those
> directly instead of converting them into .y4m
> Here how I’m using it
> intfrmaeno = 100;
> int64_tpoint = (int64_t(frameno) * pavStream->r_frame_rate.den *
> pavStream->time_base.den) / (int64_t(pavStream->r_frame_rate.num)
> av_seek_frame(fmt_ctx, VideoStreamIndex, point, 0);
Here point is always 0 as you are dividing integers. Also, as a flag,
you may want to use AVSEEK_FLAG_BACKWARD.
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