Avisynth colour changes double the bitrate
I'm fixing VHS-to-DVD conversions with Avisynth. I've found that CRF 17 gives the lowest file size and I've been encoding videos for ages without problems - if I use a higher setting then I can see artefacts.
The problem is that I've got some videos that have a darkness problem that I need to fix with this Avisynth code:
ColorYUV(gamma_y=200, off_y=-32)
But when I encode a video the bitrate is double than what it would be if I didn't use that code. These are just colour corrections so I don't understand why this happens?
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