Thunderbolt8
20th October 2016, 18:56
I want to change some colour stuff of blu-ray movies, using TMPGEnc Video Mastering Works. my original plan was to save the movie losslessly via UtVideo and then make a lossless x264 encode to reduce the filesize.
the problem seems to be that altering colours by changing the RGB values ultimately also seems to alter the colourspace of the movie. when I try to save it via UtVideo as YUV420, then the colours are slightly wrong. They are correct though when I save the file as UtVideo RGB.
when doing the lossless x264 encode though, I need to change colourspace again to YV12. so theres another conversion going on and a slightly loss of quality.
I now wonder what I can do to keep this loss of quality via conversions as small as possible.
- are there better options for me than to go Blu-ray --> UtVideo RGB --> x264 with ConvertToYV12("rec709")?
- is using UtVideo YUV444 any different than using UtVideo RGB?
- there also seems to be this lossless FFmpeg RGB command via libx264rgb. could this be of any help?
- there also seems to be the avisynth function ConvertBackToYUY2, is it possible and recommendable to use this when converting back from RGB?
the problem seems to be that altering colours by changing the RGB values ultimately also seems to alter the colourspace of the movie. when I try to save it via UtVideo as YUV420, then the colours are slightly wrong. They are correct though when I save the file as UtVideo RGB.
when doing the lossless x264 encode though, I need to change colourspace again to YV12. so theres another conversion going on and a slightly loss of quality.
I now wonder what I can do to keep this loss of quality via conversions as small as possible.
- are there better options for me than to go Blu-ray --> UtVideo RGB --> x264 with ConvertToYV12("rec709")?
- is using UtVideo YUV444 any different than using UtVideo RGB?
- there also seems to be this lossless FFmpeg RGB command via libx264rgb. could this be of any help?
- there also seems to be the avisynth function ConvertBackToYUY2, is it possible and recommendable to use this when converting back from RGB?