[FFmpeg-devel] [PATCH] libavfilter/af_atempo: offset output frames' pts by first_frame_pts / tempo
Pavel Koshevoy
pkoshevoy at gmail.com
Thu Jan 24 17:17:29 EET 2019
On Thu, Jan 24, 2019 at 8:01 AM Gyan <ffmpeg at gyani.pro> wrote:
>
>
>
> On 24-01-2019 08:18 PM, Paweł Wegner wrote:
> >
> > This fixes seeking when I have video playback sped up in ffplay like this:
> > ffplay -vf "setpts=0.5 * PTS" -af "atempo=2" input
>
> The better way to run this is
>
> ffplay -vf "setpts=0.5 * (PTS - STARTPTS)" -af "atempo=2" input
>
>
yeah, why not just do this... no code changes required. I'd prefer it
if atempo stayed simple. This way you can still use a separate pts
transform filter to adjust audio pts if necessary and without
hard-coding an assumption into atempo.
Pavel.
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