Hi,
U.G. wrote:
Hi,
I was just wondering if that is possible or even helpful while editing
hd videos with cinelerra.
But since it's only a mp4 'decoder' it shouldn't have much effect on any
playback issues, or should it?
Behaviour is the same for VDPAU and pure software decoding, but there are
some issues:
- The decoded frames have to be copied from the GPU back to system RAM, which
needs a lot of time. Decoding is still faster than pure software decoding
though.
- VDPAU decoding works for AVCHD (H.264 in MPEG-2 transport stream).
H.264 in Quicktime/mp4 however has a different bitstream format. Not
sure if this format can be handled by VDPAU directly, otherwise the data
must be repacked before.
See here for my VDPAU experiences:
http://hirntier.blogspot.com/2009/07/gpu-accelerated-h264-decoding.html
BTW, the support would have to be implemented in libmpeg3 and/or
quicktime4linux. Not sure if anyone would be up to the task.
Burkhard
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