really a good joob.
i vote to include this on the wiki page.
En/na Nicolas ha escrit:
Hello,
I put here the command lines I used to export to several formats the
videos I make with Cinelerra. I hope that will help someone reading the
mailing-list archives in the future. Cinelerra is an EXCELLENT tool, but
its export formats aren't perfect. Fortunately, there's always a good
method to use to get your video in the format and quality you need. The
command lines assume your input is PAL, 25fps and progressive. You'll
have to add/modify some parameters if your video is interlaced.
1 - ENCODING A CINELERRA VIDEO TO DVD WITH THE "NOT SO GOOD" METHOD
-------------------------------------------------------------------
Here are the syntax I used to "two pass encode" the .mov file into an
mpeg2 video. The .mov file is a progressive (non interlaced) video
produced by Cinelerra (Quicktime DV+Audio 2 complements). You have to
add some parameters to the mencoder command lines if your .mov file is
interlaced (look at the ilmv, ildct and ilme parameters).
mencoder -nosound -ovc lavc -of rawvideo -vf scale=720:576,harddup
-srate 48000 -af lavcresample=48000 -lavcopts
vcodec=mpeg2video:vbitrate=7500:vrc_maxrate=9800:vrc_minrate=2000:\
vrc_buf_size=1835:keyint=15:trell:mbd=2:precmp=3:subcmp=3:cmp=3:\
dia=-10:predia=-10:preme=2:cbp:mv0:vqmin=1:lmin=1:dc=10:aspect=4/3:vpass=1
-ofps 25 -noskip -o /dev/null movie.mov mencoder -nosound -ovc lavc -of
rawvideo -vf scale=720:576,harddup -srate 48000 -af lavcresample=48000
-lavcopts
vcodec=mpeg2video:vbitrate=7500:vrc_maxrate=9800:vrc_minrate=2000:\
vrc_buf_size=1835:keyint=15:trell:mbd=2:precmp=3:subcmp=3:cmp=3:\
dia=-10:predia=-10:preme=2:cbp:mv0:vqmin=1:lmin=1:dc=10:aspect=4/3:vpass=2
-ofps 25 -noskip -o movie.m2v movie.mov
I don't mux audio and video streams with mencoder, since the mpeg muxer
is bugged right now.
Therefore, I encode the audio stream to AC3 using ffmpeg:
ffmpeg -i movie.mov -ar 48000 -ab 384 movie.ac3
I then multiplexed the audio and video streams with mplex:
mplex -f 8 -V movie.ac3 movie.m2v -o movie.mpg
The result is good, but you can get a better result with mpeg2enc in 5
to 10 times less time...
2 - DIRECTLY EXPORTING TO MPEG2 FROM CINELERRA IS THE BEST SOLUTION
-------------------------------------------------------------------
I will continue to use the same method I used before, because that is
how I get the best looking video. I directly convert the YUV4MPEG stream
from Cinelerra with mpeg2enc using a pipe. Mpeg2enc is part of the
mjpegtools suite. It produces a very good quality video, its syntax is
simple and it's fast! =)
# For interlaced:
y4munsharp -L 1.0,0.2,0 | yuvmedianfilter -r 6 -T 3 \
yuvcorrect -T INTERLACED_BOTTOM_FIRST | mpeg2enc -v 0 -r 32 -4 1 -2 1 -s
-P -q4 -g 15 -G 15 -I 1 -B 384 -b 9800 -f 8 -o $1
# For progressive:
y4munsharp -L 1.0,0.2,0 | yuvmedianfilter -r 6 -T 3 \
-t 0 | yuvcorrect -T NOT_INTERLACED | mpeg2enc -v 0 -r 32 -4 1 -2 1 \
-s -P -q4 -g 15 -G 15 -I 0 -B 384 -b 9800 -f 8 -o $1
That command line was made with suggestions from some of you on this
mailing-list. =)
I then export an AC3 sound file from cinelerra, and combine audio and
video stream:
mplex -f 8 -V -r 10286 audio.ac3 video.m2v -o audio_video.mpeg
yuvcorrect is used in order to pass to mpeg2enc the good interlacing
mode. That solves a bug of Cinelerra in batch rendering mode. (SVN
version fetched in february 2006)
The value of the -r parameter must be adjusted accordingly to the
bitrates you use.
I'm not sure one MUST set the video buffer (-b) in the mplex command
line. On a DVD, I think the value is 1835 (that's what I read in the
mencoder docs).
3 - ENCODING TO FLV FORMAT
--------------------------
I also encode the videos I make with Cinelerra into .flv files (FLash
Video). The file weight is very small and the only thing needed to play
the video is an internet browser and a flash plugin. That's the format I
use when I want to display my video on an HTML page.
ffmpeg -i movie.mov -b 430 -s 320x240 -aspect 4:3 -pass 1 -ar 22050
movie.flv
ffmpeg -i movie.mov -b 430 -s 320x240 -aspect 4:3 -pass 2 -ar 22050
movie.flv
Pay attention to the output file extension. It's read by ffmpeg to set
the output format. ffmpeg can be used to convert videos into a lot of
different formats such as mpeg, asf, avi, flv, quicktime, wmv... It uses
the libavformat library.
4 - ENCODING A MOV VIDEO TO DIVX FORMAT
---------------------------------------
To get a divx video, I first export my work from Cinelerra into a .mov
file. I then use mencoder to convert it to Divx4/5 and AVI container.
Two pass encoding is a MUST for that format. Parameters are set in order
to get a good result at a "medium" bitrate. I set those parameters to
get files small enough to be sent over the internet. For video who are 3
minutes long, I get files whose weight is around 13Mo. If you want your
divx video to be displayed properly on a stupid but well know media
player which runs on Windows:
- the aspect ratio information contained in the header won't be read by
that player. That is why you really want to scale down the video in
order for your video to be displayed with the good aspect ratio. Width
and height must be multiples of 16. I recommend the following
resolutions for a 4/3 PAL input video: 384:288, 448:336, 512:384,
704:528.
- audio bitrate is CBR. Do not change it to VBR or that player would
loose A/V sync
- the -ffourcc parameter is needed for the video to be recognized as
Divx
Mencoder uses the libavcodec codecs.
mencoder -oac pcm -sws 2 -vf scale=${width}:${height},hqdn3d=2:1:2 -ovc
lavc -lavcopts vcodec=mpeg4:vbitrate=${video_bitrate}:vlelim=-4:\
vcelim=7:lumi_mask=0.05:dark_mask=0.01:scplx_mask=0.3:naq:v4mv:\
mbd=2:trell:cmp=3:subcmp=3:mbcmp=3:aspect=4/3:sc_threshold=1000000000:\
vmax_b_frames=2:vb_strategy=1:dia=3:predia=3:cbp:mv0:preme=2:\
last_pred=3:vpass=1:psnr:cgop
-ofps 25 -of avi movie.mov -o /dev/null -ffourcc DIVX
mencoder -srate 32000 -oac mp3lame -lameopts cbr:br=${audio_bitrate}:\
aq=0 -sws 2 -vf scale=${width}:${height},hqdn3d=2:1:2 -ovc lavc \
-lavcopts vcodec=mpeg4:vbitrate=${video_bitrate}:vlelim=-4:vcelim=7:\
lumi_mask=0.05:dark_mask=0.01:scplx_mask=0.3:naq:v4mv:mbd=2:trell:\
cmp=3:subcmp=3:mbcmp=3:aspect=4/3:sc_threshold=1000000000:\
vmax_b_frames=2:dia=3:predia=3:cbp:mv0:preme=2:last_pred=3:vpass=3:\
psnr:cgop -ofps 25 -of avi movie.mov -o movie.avi -ffourcc DIVX
5 - CONCLUSION
--------------
My advices to get the best results when converting your videos made with
Cinelerra are:
- export as an YUV4MPEG stream and encode with mpeg2enc if you want a
mpeg DVD format,
- export as a .mov file (Quicktime DV+audio 2 complements) and use
ffmpeg to encode your video into an "exotic" format,
- export as a .mov file (Quicktime DV+audio 2 complements) and use
mencoder if you want a Divx video.
Your mileage may vary. I set the parameters and choose the right encoder
for each task after reading a ton of documentation and runing a lot of
tests. Do not hesitate to comment and share your encoding tips for
cinelerra videos!
Hope that helps. =)
Nicolas, Paris.
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