[FFmpeg-devel] Once again: Multithreaded H.264 decoding withffmpeg?

Goga777 goga777
Fri May 30 09:37:04 CEST 2008

> > Could it be realisitic to achieve lets say a speedup between 30% and 50%
> > on a modern dual core CPU or are there limitations that make this a
> > dream? What about using NVIDIA's CUDA or AMD's stream computing to make
> > use of modern GPUs (given that the "native" acceleration APIs are not
> > available under Linux)?

yes, VAAPI under Linux doesn't finish yet. Nobody knows when VAAPI will finish

> There is definitively room for 50% decode speed improvement in
> ffmpeg's h264 decoder but it would take some work. CUDA et al have
> been discussed in the past (again see archives) but the kist of it is
> that while very fast, the latency can be quite significant so you
> would have to do some fancy coding to hide that. The h264 acceleration
> 'featured' by most modern GPUs is actually a HW decoder and they are
> generally limited to Level 4.1 decode 

what's mean ? with the HW decoding the pictures quality will not the best ?


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