Dot zero releases basically signify major bumps of the core libs, and are not really synced with user-facing feature changes.

I am still using 4.2. Does it make any difference if all I care about is h264 and hevc?

At a prior job we pinned to 4.2.3 because after that version an internal change massively impacted high frame rates. With a 1080p mp4 file on disk, and that disc being an ssd, version 4.2.3 delivers 700-800 frames per second, while all the versions after that 4.2.3 release - no other app or library changes - that same file may reach 300 fps. I spent some time trying to find the cause of that 50% cut in efficiency, but never found enough time.

Curious to try this version.

> I spent some time trying to find the cause of that 50% cut in efficiency

Presumably they have an issue tracker. Did you report this?

When I looked, it had been reported already.

do you have a link?

You are referring to (re)encoding a file?

Just playback.

Why would you play back at 10x?

When training an algorithm using video, seek the minimal overhead because you're going to be decompressing several billion frames.

More modern x264/x265 I guess