[FFmpeg-devel] [PATCH] HWAccel infrastructure (take 6)

Måns Rullgård mans
Sat Feb 21 13:37:37 CET 2009

Stefan Gehrer <stefan.gehrer at gmx.de> writes:

> Jean-Michel Pour? wrote:
>> Would it be possible for you HWAccel infrastructure to include some kind
>> of hardware decoding with access to frame content, without display. This
>> is needed in the case of video editors.
> This would usually require to copy the decoded frame from the graphics
> card / video memory back to system memory, which as far as I know is
> a slow operation on most systems.
> I heard once the opinion that it is so slow, it defeats the advantage
> of hardware accelerated decoding. But I have no experience in that
> matter of my own.

That definitely used to be the case.  Modern PCIe buses have much more
bandwidth, but I haven't done the maths to see it if would be

M?ns Rullg?rd
mans at mansr.com

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