[FFmpeg-user] How to slow down a video

[penguin flying]

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
>
> --
> Von meinem Seibert gesendet
>
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