[FFmpeg-user] Reduce CPU usage to match VLC

Reindl Harald h.reindl at thelounge.net
Mon Feb 10 16:46:58 CET 2014

Am 10.02.2014 16:42, schrieb Loadlinx:
> Its an older CPU and i want to be able to transcode multiple streams. At
> 100% core use i can only do 4 streams.

try "-threads 1" to let ffmpeg only use one core
the 120% below indicates that it is a multicore CPU
and there is at least 20% of the second one in use

however, modern software is written for performance
and use the existing hardware ressources, you can
have more than one process at the same time per core

> On Mon, Feb 10, 2014 at 10:40 AM, Reindl Harald <h.reindl at thelounge.net>wrote:
>> Am 10.02.2014 16:36, schrieb Loadlinx:
>>> Hello,
>>> Would like to use ffmpeg instead of VLC for the given task but I can not
>>> seem to reduce the CPU usage.
>>> Here is how I do it in VLC:(~30% CPU usage)
>>> /vlc -vvv --sout '#transcode{venc=x264{preset=
>> ultrafast},vcodec=h264,vb=1500,acodec=aac,ab=128,samplerate=48000}:standard{access=http,mux=ts,dst=
>>> Here is my ffmpeg command: (~120% CPU usage)
>>> ./ffmpeg -i <>
>> -vcodec
>>> libx264 -vb 1500k -s 480x320 -acodec libfdk_aac -ab 32k -f flv rtmp://
>>> <>
>>> Quality seems to me somewhat the same but ffmpeg uses 3x more CPU then
>> VLC.
>>> Any idea how I can match VLC cpu usage with ffmpeg?
>> wrong question
>> maybe it is also 3 times faster
>> CPU and hardware in general is there to get used
>> why would you buy a expensive CPU to let it idle?

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