[Libav-user] ffmpeg H.264 decoding

Carl Eugen Hoyos cehoyos at ag.or.at
Tue Nov 20 11:12:11 CET 2012

Malik Cissé <mc at ...> writes:

> My question:
> The decoding goes very fast and CPU usage is low.
> Can I guaranty same performance on similar CPU’s?

I may misunderstand the question, but decoding 
is a deterministic process (if that is what you 
want to know).
General system load and other factors that are 
very difficult to foresee in real life of course 
affect decoding speed.

> Is any Hardware acceleration (mmx, GPU, DXVA, etc) 
> used to decode the frames?

SIMD (mmx) optimizations are hopefully used on 
CPUs that support it, hardware decoding is only 
used if you explicitly requested it.

Carl Eugen

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