x264 first pass crf (through megui)?

[Terranigma]

Is it possible to do a first pass using constant quality instead of avg bitrate? If so, how'd I got about doing that?
:thanks: In Advance.

[foxyshadis]

You can mix and match modes, to a degree, so yes it's perfectly possible in the codec. In MeGui, it's a bit tricky - you have to run 1st and 2nd passes separately, adding --crf xx to the custom command line of the first. (Alternately, running a constant quality with --stats on the custom line, but the nice thing about built-in multipass modes is that it generates the stats file names for you.) No built-in method.

Actually, after testing, x264 uses whatever's first - bitrate - not whatever's last, so you have to use the const. quality + stats file method after all.

Isn't this more a GUI forum question? ;)

[Terranigma]

Isn't this more a GUI forum question? ;)
Thanks, & Yes, feel free to move it there. I was going to post this in the encoder gui forums, but I thought I could probably get the same answer here, (since i've mentioned x264), a bit quicker since this forum is more lively than the gui forum =P

[akupenguin]

Actually, after testing, x264 uses whatever's first - bitrate - not whatever's last

works for me. `x264 --bitrate 100 --crf 20` is crf.

[foxyshadis]

works for me. `x264 --bitrate 100 --crf 20` is crf.

Works for me as well, it turns out MeGUI's filtering it out. I'll send a patch to them.