[FFmpeg-user] Cutting out part of a video does not work

Cecil Westerhof Cecil at decebal.nl
Sat Mar 27 06:57:00 EET 2021

Carl Eugen Hoyos <ceffmpeg at gmail.com> writes:

> Am Fr., 26. März 2021 um 17:28 Uhr schrieb Cecil Westerhof via
> ffmpeg-user <ffmpeg-user at ffmpeg.org>:
>> ffmpeg -y -ss 1189 -i 2021-03-25ToastmastersClubAvond.mp4
>> -to 442 -acodec copy -vcodec libx264 -crf 8 -async 1 speech.mp4
> The x264 documentation states that there is no good
> reason to use "crf 8" and please don't use "acodec copy"
> with "async 1", these two options are exclusive.

I thought that crf 8 would minimise degrading the video. So that is
not true.
Long ago I needed that, but probably I did not use acopy there,

Thanks. I will change that.

Cecil Westerhof
Senior Software Engineer
LinkedIn: http://www.linkedin.com/in/cecilwesterhof

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