thanks very much Kevin, this is helpful. I'll experiment with this, and
zeranoe's new build (20151109-git-480bad7) which incorprates zlib. If
and when I learn something, I'll report back.
what happens is that there is an auto inserted scale filter used to
convert from RGB to YCbCr, the auto inserted defaults/features don't
work for your case you could try explicitly add the scale using
-vf scale=in_range=XXX:out_range=YYY:out_color_matrix=bt709
Replace XXX and YYY with 'full'/'tv' and you can control the scaling
(obviously you should fill in the appropriate matrix values for your
case).
It isn't perfect, and depending on your destination you may not get
full [0-1023] due to some codes being reserved for sync in video
formats, but this way you may get something closer to what you need
without needing the recompile.
Kevin
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