Originally Posted by Bernix View Post
so conclusion?
a) using b-frames in lossless mode is bad idea (b-frames are smallest) but it doesn't results in smallest filesize. And time is several times longer then x264 lossless (same output results pixel by pixel)
b) using b-frames are worth of bigger filesize and slower speed (for some to me unknown reason)
Not entirely...

Check this.

Originally Posted by Bernix View Post
But on I-frames only lossless compression x265 must win in smallest file from them all.
Surprisingly not...

Check this. (notice the I-frame info in the command log)