Using this sample:

ffmpeg -f lavfi -i color=c=black:s=1280x720 -i chromakey_sample.mp4 -an
-c:v libx264 -preset veryfast -crf 18 -shortest -filter_complex
-map "[out]" -y output.mkv

The last parameter to the chromakey filter enables opencl acceleration.


Could you please send the patch as attachments? I merge the code, but some 
compile errors occur.

Best regards

You can pull from my github, the patches are in the chromakey branch:

If you want just the chromakey patch itself:

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