Operating system: Win7x64, Ubuntu18x64
Short description of error
Files encoded through FFMpeg.h264 in Blender show up with a consistent color space offset (warmer and different gamma) in other software/players/viewers, but are viewed "as saved" if opened in Blender. At the same time h264 files produced in other software are open in Blender with no noticeable color shift, but re-rendering them through Blender introduces it.
Same content rendered into other formats, like PNG, does not have such effect.
At first I thought those are my codecs on a windows machine, but the output/behavior is the same on Ubuntu.
Given that the h264 files produced elsewhere are open in Blender without matching "negative" color offset (at least one I could see), could it be that FFMpeg in Blenders is set up to default to some particular color space for encoding?
Exact steps for others to reproduce the error
Open, render animation, compare to what is in the source image in any other software.