I currently have a large collection of songs (regional) which are 1080p Remuxes from BluRays (these are not copyright protected FYI). I intend to compress them to save space as they are currently take terabytes of storage and very inefficiently encoded (some are even using constant bit rates (OMG! Right!)). The bit rates currently are in excess of 40mbps on x264 High Profile L4.1 so quality is still on par despite the bad encodes.
I intend to encode them using handbrake with x264 or x265 but I can't seem to decide on some factors. With x264, I would generally go with 'CRF 14/15' and 'Very Slow' preset and 'film tune'. At CRF 16, I can see distortion in the grain in some scenes which I don't like! As you can tell from CRF14, I'm kinda a quality freak.
With my initial testing with x265, I re-encoded using source with same bit rates as x264 CRF14 did (2-pass very slow preset ofcourse!) as I am not bothered to remap equivalent CRF with x265 at this point. The difference in quality was not that much for me except very slightly better grain in some scenes. Infact overall, x265 seemed to denoise the picture a bit despite any alterations I made to tune (denoising and decombing were disabled obviously). At lower bitrates however (~4mbps), x265 is definitely a mega-jump over x264. The quality difference is enormous!!
I know x265 is still in development stage but would you think there is any point in waiting for it to get better? I can wait a couple of months maybe an year for its CRF to become a bit better or with my high bitrate requirement (~CRF14 x264) would you say it won't make much of a difference with x265?
P.S. Encoding times and CPU usage are NOT an issue so ignore those factors plz.