Nicolas wrote:
You second pass starts and use the logfile of the first pass when the
first pass isn't finished.
Sorry, I wasn't clear enough. The first is finished when I start the
second pass. I agree with you that doing a 2nd pass while the first is
still in progress misses the point of two|n-pass encoding. Let me
outline the process a bit more clearly:
1. Render your film's audio to a wave file, say "final-cut-direct.wav"
2. Render your film's video using YUV4MPEG pipe and mencoder. I've
called the rendered file "hiQ-x264-shizuocha.avi" (which replaces the
%). The lone '-' tells mencoder to expect piped input from standard in.
-audiofile tells mencoder to use final-cut-direct.wav as the audio
(mencoder won't encode without both audio and video present, and this
way, it's multiplexed together at the same time). You can even use -af
channels to simulate surround sound if you didn't do that in your
cinelerra sessions. Here is the pipe command:
mencoder - -audiofile ./final-cut-direct.wav -oac lavc -lavcopts
acodec=ac3 -noaspect -noskip -ovc x264 -x264encopts
crf=20:subq=6:4x4mv:8x8dct:me=3:frameref=5:bframes=3:b_pyramid:weight_b:pass=1
-passlogfile hiQ-pass1.log -o %
3. Wait for cinelerra/mencoder to finish their work.
4. Start the second pass, using the complete "hiQ-x264-shizuocha.avi"
file. This time, the input file is "hiQ-x264-shizuocha.avi" and not '-'
(standard in). Use -oac copy because you don't need to re-encode the audio.
mencoder hiQ-x264-shizuocha.avi -oac copy -noaspect -noskip -ovc x264
-x264encopts
bitrate=1000:crf=20:subq=6:4x4mv:8x8dct:me=3:frameref=5:bframes=3:b_pyramid:weight_b:pass=2
-passlogfile ../hiQ-pass1.log -o hiQ-x264-shizuocha-p2.avi
I've done the video testing you've mentioned, and cinelerra does indeed
have quality problems when exporting back to dv (in my cases). Any
graphic layovers (from svg-derived png files, jpg stills, or even the
titler video effect) or faster horizontal motion (pans, moving scenery)
are horrendously re-encoded. I prefer as few transitional files as possible.
Joe
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