[FFmpeg-devel] [Patch] CUDA Thumbnail Filter

[Yogender Gupta]

I believe there were concerns on pushing the CUDA thumbnail filter and that is possible to get similar performance using the normal thumbnail filter. The CUDA thumbnail filter is useful for generating thumbnails on the hwaccel cuvid pipeline, as it can directly operate on the video memory and give significantly higher performance, owing to the fact that there are no sysmem to vidmem copies as well as the fact that the encoding and CUDA HW being separate, the CUDA thumbnail filter may not degrade the encode performance at all.

The following commands run show that using the Cuda thumbnail filter on the hw pipeline could be 3x-4x faster.

E:\>ffmpeg -vsync 0 -y -hwaccel cuvid -c:v h264_cuvid -i amazing.264 -filter_complex [0:v]split=2[in0][in1];[in0]thumbnail_cuda=600,hwdownload,format=nv12[out0];[in1]scale_npp=1920:1080
[out1] -map [out0] thumb%03d.jpg -map [out1] -c:v h264_nvenc out.264 2> hw.txt

E:\>ffmpeg -vsync 0 -y -c:v h264_cuvid -i amazing.264 -filter_complex [0:v]split=2[in0][in1];[in0]thumbnail[out0];[in1]scale[out1] -map [out0] thumb%03d.jpg -map [out1] -c:v h264_nvenc
out.264 2> sw.txt

Thanks,
Yogender

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