Encode libx265 at higher quality:

Command: ffmpeg -i A.mkv -vf yadif=1 -acodec flac -compression_level 8 -ac 2 -vcodec libx265 -crf 22 B.mkv

I find that crf 22 is equivalent to BD quality libx264. Lower number for crf is higher quality.
H265 does not need as low of a number to match the quality of 264 (crf 28 for 265 is about 23 for 264).
17/18 crf is max quality for 264 that is still disenable by most humans and screens.
You be wasting bandwidth / processing power by using much more then 17/18 for h264 (I am amusing that is around 22 for h265).

Sources:

https://trac.ffmpeg.org/wiki/Encode/H.265
https://branden-g.ca/Notes/Tech-Help/Linux-Repair/ffmpeg/H265-software-encode-with-deinterlace.php
https://trac.ffmpeg.org/wiki/Encode/H.264
https://superuser.com/questions/1448982/will-i-get-any-visual-benefit-if-i-use-crf-values-below-17-18-in-x264-ffmpeg#1449560

Date: November 14th 2023

Encode H265 Video at lossless conversion:

ffmpeg -i A.mkv -vf yadif=1 -acodec flac -compression_level 8 -ac 2 -vcodec libx265 -x265-params lossless=1 B.mkv
*Note this is truly lossless and will highly likely lead to a file size significantly bigger then the source file.

Sources:

https://unix.stackexchange.com/questions/230800/re-encoding-video-library-in-x265-hevc-with-no-quality-loss
https://x265.readthedocs.io/en/master/lossless.html#lossless-encoding

Date: January 9th 2024

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