[FFmpeg-user] Multiple outputs worse performance than multiple instances

[Carl Lindqvist]

2013/10/21 Carl Lindqvist <lulebo at gmail.com>:
> Hello. I have done some more testing and been trying to squeeze out
> more performance from my encodes. My main goal is to do
> reading/decoding/deinterlacing/cutting only once, and do resize and
> encode seperately. Here is the current command (put in a bat file):
>
> ffmpeg -i %1 -filter_complex "[0:0]
> yadif=0,select='-between(t,5,20)-between(t,40,52)',setpts=N/FRAME_RATE/TB,split=5
> [a1] [b1] [c1] [d1] [e1];[0:1]
> aselect='-between(t,5,20)-between(t,40,52)',asetpts=N/SR/TB,asplit=5
> [a2] [b2] [c2] [d2] [e2]" -y \
> -map "[a1]" -map "[a2]" -s 128:72 -c:v libx264 -preset veryfast
> -x264opts keyint=75:min-keyint=75:no-scenecut -b:v 98k -minrate 98k
> -maxrate 98k -bufsize 196k -profile:v baseline -aspect 16:9 -c:a
> libvo_aacenc -b:a 32k -ac 2 %~n1130.mp4 \
> -map "[b1]" -map "[b2]" -s 384:216 -c:v libx264 -preset veryfast
> -x264opts keyint=75:min-keyint=75:no-scenecut -b:v 252k -minrate 252k
> -maxrate 252k -bufsize 504k -profile:v baseline -aspect 16:9 -c:a
> libvo_aacenc -b:a 48k -ac 2 %~n1300.mp4 \
> -map "[c1]" -map "[c2]" -s 640:360 -c:v libx264 -preset veryfast
> -x264opts keyint=75:min-keyint=75:no-scenecut -b:v 704k -minrate 704k
> -maxrate 704k -bufsize 1408k -profile:v baseline -aspect 16:9 -c:a
> libvo_aacenc -b:a 96k -ac 2 %~n1800.mp4 \
> -map "[d1]" -map "[d2]" -s 768:432 -c:v libx264 -preset veryfast
> -x264opts keyint=75:min-keyint=75:no-scenecut -b:v 1404k -minrate
> 1404k -maxrate 1404k -bufsize 2808k -profile:v main -aspect 16:9 -c:a
> libvo_aacenc -b:a 96k -ac 2 %~n11500.mp4 \
> -map "[e1]" -map "[e2]" -s 1024:576 -c:v libx264 -preset veryfast
> -x264opts keyint=75:min-keyint=75:no-scenecut -b:v 2244k -minrate
> 2244k -maxrate 2244k -bufsize 4488k -profile:v main -aspect 16:9 -c:a
> libvo_aacenc -b:a 256k -ac 2 %~n12500.mp4
>
> Everything works perfectly, but cpu usage on the very fast server (16
> cores) is quite bad. I can set -preset slow and get more cpu usage and
> get better cpu usage.
>
> This leads me to believe decoding is either the culprit or I am doing
> something really stupid somewhere. I must confess that I do not fully
> understand the filter_complex yet, but I think I have got a hang of
> it. I am just not sure how it is handled behind the scenes.
>
> What is a good way to test decoding speed/cpu usage independantly? And
> can I do something better in the command above?
>
> Best Regards
> Carl L
>
> 2013/10/12 Carl Eugen Hoyos <cehoyos at ag.or.at>:
>> Carl Lindqvist <lulebo <at> gmail.com> writes:
>>
>>> My results are very bad.
>>
>> Command line and complete, uncut console output
>> missing.
>>
>> Carl Eugen
>>
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Sorry for the previous top post. Gmail is giving me a headache..

I did a small typo/brain fart, what I meant to say was:

Everything works perfectly, but cpu usage on the very fast server (16
cores) is quite bad. I can set -preset slow and get the same fps
encoding speed, but with higher cpu usage.

Best regards
Carl L