[FFmpeg-user] -threads 1 seems not work

Paul B Mahol onemda at gmail.com
Mon Sep 12 11:55:41 EEST 2022

On 9/12/22, Cecil Westerhof via ffmpeg-user <ffmpeg-user at ffmpeg.org> wrote:
> For a certain conversion I use '-threads 1'. As I understand it ffmpeg
> should then only use one CPU. I see that the CPU usage is lower as
> without this parameter, but it goes up to 180%. So clearly it is using
> at least two CPU's.
> Or am I understanding this parameter wrongly?
> I am using ffmpeg version 4.3.4-0+deb11u1. (Debian always lags a
> little bit behind to be more stable.)

threads can be used for input decoding, output encoding and filtering.

You need to use threads = 1 for all 3 of them.

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