Blender 2.79 added the ability to encode video using ffmpeg's CRF (constant rate factor) technique.
I assume this is controlled by the Output quality setting in the Encoding subpanel. Unfortunately, all my previous workflow has been using numbers for CRF (like 20 or 25 or 30) with ffmpeg in a makefile. It is not obvious which of the qualities in blender's UI maps to these values.
For each of the Output qualities, what is the corresponding CRF value? (Although I bet the
lossless and CBR options don't correspond to CRF operation)