Arthur Muller <muller@...> writes:

> My constraint is a client that requires MP4 with OpenH264 
> of the highest possible quality for scientific presentations.

There should be no problem: Nobody can see the difference 
between a high-bitrate yuv420p h264 encoding and a lossless 
yuv420p h264 encoding.
(And openh264 only supports yuv420p, this is not your fault.)

What is your problem? Please test current FFmpeg git head and 
provide the command line you tested together with the 
complete, uncut console output and explain what goes wrong.

Carl Eugen

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