Constant quant or equivalent for compressability test?

[Richard Berg]

With Xvid I'd test compressability using constant quant=3 or similar. What is an equivalent setting I could use with x264? The final encodes will use Sharktooth's HQ-Slower/Slowest presets but I want to see what effect various filtering methods have.

[Audionut]

From a vague memory, x264 quant 18 = xvid quant 2.
Keeping in mind that x264 default constant quant setting is 26 vs xvid default of 4.

Personally I think quant 26 is to much compression, and would run the compression test at quant 24 first pass, with a 100% quality "so to speak" second bitrate run.

[buzzqw]

i prefer quant 19, but as usually quality is a personal thing :)


BHH

[708145]

i prefer quant 19, but as usually quality is a personal thing :)
BHH

I prefer -crf 22 so far :)

bis besser,
T0B1A5

[Audionut]

Thinking about it, a --crf # run would probably be the best bet as far as a compressability test is concerned.

Say Joe likes the quality of --crf 23. So he runs a small test at that setting.
Finds the resulting bitrate.
Encodes his clip, 2 pass at the resulting bitrate.

[708145]

Thinking about it, a --crf # run would probably be the best bet as far as a compressability test is concerned.

Say Joe likes the quality of --crf 23. So he runs a small test at that setting.
Finds the resulting bitrate.
Encodes his clip, 2 pass at the resulting bitrate.

save some time by doing first pass with --crf X and then directly a second pass with the bitrate of the crf run :P

edit: just specify --pass 1 in the --crf run

bis besser,
T0B1A5

[omion]

I'd have to add my support to the --crf switch (with --pass 1, as Tobias pointed out). This is why I wanted the --crf switch in the first place ;) .