Selur's Little Message Board

why i set x264 reference frame is 3, but encoded file is 4? how to solve?

I can reproduce this, but to me this does not look like a Hybrid bug, but a problem of MediaInfo (or x264?), since:
a. Hybrid does call x264 properly with --ref 3
b. x264s SEI data (MediaInfo reports this as 'Encoding settings' also reports 'ref=3'
might be related to: https://sourceforge.net/p/mediainfo/bugs/485/
Seems like it's related to whether b-frame pyramid is used or not.
All in all it does not look like something that could be changed in Hybrid.

Cu Selur

according to the intro,




so if have time, is it always good to use max reference frame 4, b-frame 16, and preset placebo, to get the best encode quality? thanks

Yes, maxing out ref-frames and b-frames and using placebo should improve compressibility.
Best encoding quality can only be archived through lossless encoding.

Ah, I think I just encountered this, too; perhaps in a different perspective/setting.

Expected output: Slow, Ref 5
Output: Slow, Ref 4

As far as I can tell, "--ref 5" was not called because "--preset slow" supposedly has it already, according to the help popup in the presets. Is it possible that Slow has ref 4 instead? Tried manually adding the command line --ref 5, but it just eats that input, too.
Sample debug of my tinkering attached.
[attachment=1356]

This depends on whether b-pyramid is used or not.
-> Not a bug in Hybrid, inconsistency between x264 and MediaInfo, nothing for me to do.

Cu Selur