Quote:
Originally Posted by holygamer
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?
|
Don't know what your script does exactly to perform the "color correction", but if, for example, it adds any dithering (noise) during the process it should be obvious why the file will be "harder" to compress afterwards and thus needs more bits (at the same CRF).