Ok, I've come up with something really good, if I may say so myself ;)
Like before, my goal is to create 1920x1080p video with audio that plays
on the PlayStation3.
I'm using two rendering profiles within Cinelerra; one for audio and one
for video. First the audio profile renders the audio, including fade
in/out effects etc. Secondly the video profile renders the video
including effects, and encodes both video and audio to a final MP4 file.
This approach also gives you the option of only rendering a selection of
your project.
The video encoding uses a one-pass encoding approach, using ffmpeg and
its rather new -crf option, which produces high quality stuff. Combined
with ffmpeg's -vpre shortcut option, the command line also gets reduced
to only a few arguments (but you can still write them it their full
length, if you prefer).
My two rendering profiles are as follows:
"(1 of 2) Audio [WAV]"
Render to file: /tmp/audio.wav
File format: WAV
Compression: 16 bit linear PCM
"(2 of 2) Video [MP4+H264+AAC]"
Render to file: /home/me/video.mp4
File format: YUV4MPEG Stream
Use Pipe: ffmpeg -y -threads 0 -f yuv4mpegpipe -i - -i /tmp/audio.wav
-acodec libfaac -ab 384k -vcodec libx264 -vpre hq -crf 20 -level 41 -f
mp4 % && rm -f /tmp/audio.wav
(By naming the profiles as above, you get them ordered nicely in the
profile drop down menu =)
Run the first, then run the second, and you're done! The lower the crf,
the higher the quality (and file size). "-vpre hq" hides care of all
those nasty hq video encoding parameters. Any details you'll have to
get from someone else than me ;).
I think I'll be happy for some time with this setup, even though I have
to remember to render twice. Luckily the sound is rendered very fast.
If only the Cinelerra-CV developers would make a stream similar to
YUV4MPEG but that included uncompressed PCM, this could all be done with
just one rendering profile and be perfect! ;)
Here's a splendid tutorial on how to compile the newest ffmpeg from
source on Ubuntu:
http://ubuntuforums.org/showthread.php?t=786095
And some reference material:
http://rob.opendot.cl/index.php/useful-stuff/ffmpeg-x264-encoding-guide/
Render to file: /tmp/audio.wav
http://en.wikipedia.org/wiki/H.264#Levels
--
Stephan
http://asklandd.dk/
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