Paul B Mahol <one...@gmail.com> writes: > On 9/12/22, Cecil Westerhof via ffmpeg-user <ffmpeg-user@ffmpeg.org> wrote: >> Paul B Mahol <one...@gmail.com> writes: >> >>> On 9/12/22, Cecil Westerhof via ffmpeg-user <ffmpeg-user@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. >> >> I see: >> -filter_threads >> -filter_complex_threads >> >> But nothing for input decoding and output decoding. >> >> >> By the way: does this mean that ffmpeg can always use 4 CPU's? >> (input, output, filtering and complex filtering) > > No, ffmpeg may use sometimes only 1 or sometimes all available CPUs. > That depends on many factors.
OK. But that still means it can use three CPU's if it wants to if I have set all three to one? > -threads is both input and output option. -- Cecil Westerhof Senior Software Engineer LinkedIn: http://www.linkedin.com/in/cecilwesterhof _______________________________________________ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
