[Libav-user] Options to minimize decoder CPU use
Carl Eugen Hoyos
cehoyos at ag.or.at
Fri Dec 7 09:33:25 CET 2012
Jason Livingston <jettoblack at ...> writes:
> When decoding MPEG-2 or H.264 video with lavc, what decoder
> flags or options can I use to decode as quickly as possible?
Do I understand you correctly that you want to maximize CPU use?
> I see AVCodecContext has some options such as skip_idct and
> skip_loop_filter, which I set to AVDISCARD_ALL, but at least
> for MPEG-2 the decode is not significantly faster.
Could you elaborate?
Skipping idct makes a large difference here for mpeg-2
Perhaps test with the cli (ffmpeg -benchmark -skip_idct)
and post some output.
> Are there any other good options to use?
You can use "fast" if you know that the input is valid
(not corrupt) but it does not add much additional
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