> On 8 Jul 2022, at 04:23, Budi <budikus...@gmail.com> wrote:
> 
> $ ffmpeg -i "b.mp4" -to 0:2:20  a.mp4
> 
> 
> used to do it nicely done in few seconds

FFmpeg -i "b.mp4" -to 0:2:20  -c: copy a.mp4
Mind the codec copy.

If you omit that, FFmpeg will transcode, resulting in speed and quality loss.

Bouke

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