[FFmpeg-user] maximum of cpus or threads supported in on decoding

heyufei2008 at outlook.com heyufei2008 at outlook.com
Wed Dec 18 16:33:34 EET 2019

Hi Carl

It seems that ffmpeg does not support numa and processor groups, is there a reason for that ?

From: ffmpeg-user <ffmpeg-user-bounces at ffmpeg.org> on behalf of Carl Eugen Hoyos <ceffmpeg at gmail.com>
Sent: Tuesday, December 17, 2019 3:43 PM
To: FFmpeg user questions <ffmpeg-user at ffmpeg.org>
Subject: Re: [FFmpeg-user] maximum of cpus or threads supported in on decoding

Am Di., 17. Dez. 2019 um 21:23 Uhr schrieb heyufei2008 at outlook.com
<heyufei2008 at outlook.com>:

> Does ffmpeg's h264 decoder supports decoing with more than 64 cpus, say 72 cpus ?
> In windows, there are 2 processor groups, each with 36 cpus when there are 72 cpus.
> The code in ffmpeg
> MAX_THREADS is defined as 64  in frame_thread_encoder.c
> #define MAX_THREADS 64

Please test if raising this number has a positive effect on decoding time
(I doubt it), another question is if it helps with encoding.

Carl Eugen
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