[FFmpeg-devel] [Patch] CUDA Thumbnail Filter

[Rostislav Pehlivanov]

On 11 September 2017 at 05:59, Yogender Gupta <ygupta at nvidia.com> wrote:

> 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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Only 3 to 4 times? This is easily doable with SIMD.