[FFmpeg-user] Reduce CPU usage to match VLC

Reindl Harald h.reindl at thelounge.net
Mon Feb 10 16:58:49 CET 2014

do you *think* that or have you tried it?

you can't calculate "booh CPU usage multiplied with cores gives streams"
the one and only question is if the overall load can handle
the streams without drop frames and how the OS will schedule
the threads and processes

the final goal is that any of your cores are 100% loaded and
nothing breaks down

Am 10.02.2014 16:51, schrieb Loadlinx:
> At 120% i am still limited to only ~4 transcoding sessions.
> Maybe the quality is not the same and maybe ffmpeg is faster.
> I am willing to sacrifice quality for lower CPU usage. Is this possible? I
> tried -preset:ultrafast but no difference in CPU usage observed.
> On Mon, Feb 10, 2014 at 10:46 AM, Carl Eugen Hoyos <cehoyos at ag.or.at> wrote:
>> Loadlinx <limiteddi <at> gmail.com> writes:
>>> /vlc -vvv --sout
>>> '#transcode{venc=x264{preset=ultrafast}
>>                                ^^^^^^^^^
>>> ./ffmpeg -i <>
>>> -vcodec libx264 -vb 1500k -s 480x320 -acodec libfdk_aac -ab 32k
>>> -f flv rtmp://
>> (Complete, uncut console output missing.)
>> Aren't these two completely different things?
>> Or does libx264 nowadays default to ultrafast?
>>> Quality seems to me somewhat the same
>> somewhat: maybe
>> the same: most likely not

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