On 2017-07-25 09:41, Yogender Gupta wrote:
Currently combining CPU and CUDA filters requires insertion of
hwupload and download filters. I am trying to simply this by auto
insertion of these filters. This patch is for hwupload_cuda, but I
want to do this for hwdownload as well.
The attached patch automatically inserts hwupload_cuda filter when it
detects a GPU filter after a CPU component.
Before the patch
ffmpeg.exe -y -i traffic_flow_1280x720_420.y4m -vf "hwupload_cuda,
scale_npp=176:144" out.h264
After the patch the command line works without inserting the
hwupload_cuda filter (auto inserted by ffmpeg)
ffmpeg.exe -y -i traffic_flow_1280x720_420.y4m -vf "scale_npp=176:144"
out.h264
Thanks,
Yogender
At various points in time, people have observed that hwupload_cuda
should be obsolete as
the generic hwupload filter should be sufficient in combination with a
properly implement
hwcontext (which cuda has). I don't think anyone has validated this
properly, but that
should be step one.
With that established, auto-insertion of hwupload/download should be
done in a generic way;
I'm not the person to say how that should be done, but I'm pretty
confident that the
people who know this stuff (wm4, Mark Thompson, etc) would agree this is
the preferred
approach.
--phil
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