I've been compressing most of movies using average bitrate instead of the RF slider, because I know exactly how the file is going to be. But recently, I read that using the RF slider brings out more consistent quality, since the bitrate shouldn't be constant. I have a movie that I don't want any quality loss with, one more important than most of my collection. All I want to do is remove the letterboxes. So I compressed with an RF value of 12. The compressed MP4 of the 25,000 kbps video ended up being twice as big. I wasted over ten hours. How do I calculate it? What RF value would I choose for this video?
Also, how much have I ruined my film collection by using average bitrate (18-22 MB) instead of the slider and using Main profile 4.0 instead of High 4.1? I did always compare the my compressed file with the raw, but I had no idea it could look even better.