[FFmpeg-user] Extra video frames were added when doing the resolution transform

[Carl Eugen Hoyos]

Am Sa., 7. März 2020 um 11:16 Uhr schrieb Du Dengke <pinganddu90 at gmail.com>:

> When I run the following command
>     ffmpeg -i test.mp4 -vf scale=640x360 test2.mp4

Complete, uncut console output missing.

> 32 frames was added after the transform, and I saw some static picture
> within the first second.
> My question:
>     Why the 32 frames was added, does this video trigger some mechanism?
> And why the static picture was added at the first?

See above, most likely because audio and video have different
start times which FFmpeg's muxer does not support.

Carl Eugen