[FFmpeg-user] How to slow down a video

penguin flying theflyingpenguin2020 at gmail.com
Fri Mar 27 04:05:14 EET 2020

for video: -vf setpts=0.5*PTS
for audio: -af atempo=2

Ulf Zibis <Ulf.Zibis at gmx.de> 于2020年3月27日周五 上午8:42写道:

> Hi,
> I want to slow down a mp4 video from 30 to 15 fps, so it has twice
> duration. Also I want the audio stream to to transform so that the audio is
> transformed to the natural frequency, i.e. the speach is in half speed.
> How can I do this?
> -Ulf
> --
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