[FFmpeg-user] speeding up filter complex

Bouke (VideoToolShed) bouke at videotoolshed.com
Sun Jun 29 13:12:39 CEST 2014

----- Original Message ----- 
From: "Carl Eugen Hoyos" <cehoyos at ag.or.at>
To: <ffmpeg-user at ffmpeg.org>
Sent: Sunday, June 29, 2014 1:08 PM
Subject: Re: [FFmpeg-user] speeding up filter complex

> Bouke (VideoToolShed <bouke <at> videotoolshed.com> writes:
>> Trying to make a quad out of 4 input files.
>> All works swell, but the rendering is slow, while the
>> process is only taking up 15% CPU.
>> (With -threads 12 i'm getting 31 fps. Setting threads
>> to 2 gives almost the same speed, threads set to 1 gives
>> my 28 fps.)
> Did you test if the bottleneck is the scale or the overlay
> filter?

Yeah, i did, Bottleneck is definitly the overlay.
When i input pre-scaled files and omit the scaling in the overlay routine, 
it's only about 10% faster.
Moritz is right, Overlay is only using one core so it seems.


> Carl Eugen
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