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+--- Thread: [HELP] why i set x264 reference frame is 3, but encoded file is 4? (/thread-1761.html)
why i set x264 reference frame is 3, but encoded file is 4? - ssdde - 06.03.2021
why i set x264 reference frame is 3, but encoded file is 4? how to solve?
![[Image: eqaM6xLrpyk8j3G.jpg]](https://i.loli.net/2021/03/06/eqaM6xLrpyk8j3G.jpg)
RE: why i set x264 reference frame is 3, but encoded file is 4? - Selur - 06.03.2021
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
RE: why i set x264 reference frame is 3, but encoded file is 4? - ssdde - 10.03.2021
according to the intro,
![[Image: 7NBAgOq5YdbC8wy.jpg]](https://i.loli.net/2021/03/10/7NBAgOq5YdbC8wy.jpg)
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
RE: why i set x264 reference frame is 3, but encoded file is 4? - Selur - 10.03.2021
Yes, maxing out ref-frames and b-frames and using placebo should improve compressibility.
Best encoding quality can only be archived through lossless encoding.
RE: why i set x264 reference frame is 3, but encoded file is 4? - Lloyd Dunamis - 15.03.2021
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]
RE: why i set x264 reference frame is 3, but encoded file is 4? - Selur - 15.03.2021
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