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Old 12th May 2020, 14:05   #16  |  Link
alxscott
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Join Date: Aug 2013
Posts: 9
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I managed to find a good compromise in quality and speed; with satisfactory results which for me were : FHD SDR tonemapped output.

For anyone else; this is the command I've decided to use going forward:

Code:
ffmpeg -vsync 0 -hwaccel cuda -init_hw_device opencl=ocl -filter_hw_device ocl -extra_hw_frames 3 -threads 16 -c:v hevc_cuvid -resize 1920x1080 -i INPUT -vf "format=p010,hwupload,tonemap_opencl=tonemap=mobius:param=0.01:desat=0:r=tv:p=bt709:t=bt709:m=bt709:format=nv12,hwdownload,format=nv12" -c:a copy -c:s copy -c:v libx264 -max_muxing_queue_size 9999 OUTPUT
This completed a conversion from a 4K UHD Dsic Rip MKV in 67m27s, compared to a file runtime of 2h01m49s so and average conversion rate of 1.8x.

Just as a note, I decided to use software encoding due to the significant quality increase but minimal time increase for encoding .

Thank you all.
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