Bttv
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Acquisition de l'entrée composite encodée en Divx4:
Première passe avec capture du son en raw:
mencoder -tv on:driver=v4l:input=1:norm=PAL:width=384:height=288:outfmt=rgb16 -o file1.avi -ovc lavc -lavcopts vcodec=mjpeg -oac copy
Deuxième passe pour compresser le son:
mencoder file1.avi -o file2.avi -ovc copy -oac mp3lame
vcodec=<value> use the specified codec (there is no default, you must specify it):
__mjpeg__: Motion JPEG
__h263__: H263
__h263p__: H263 Plus
__mpeg4__: DivX 4/5
__msmpeg4__: DivX 3
__rv10__: an old !RealVideo codec
__mpeg1video__: MPEG1 video :)
vhq high quality mode, encode each macro
block in all modes an choose the smallest
(slow). (default: HQ disabled)
vpass=<1-2> Activates internal 2pass mode (default: disabled):
1: first pass
2: second pass
vbitrate=<value> specify bitrate (pass 1/2) in kBit <4-16000> or Bit <16001-24000000>
(warning: 1kBit = 1000 Bits)
(default: 800)
Pour le convertir:
[mencoder <source> -oac mp3lame -lameopts br=96:abr -ovc frameno -o frameno.avi] mencoder <source> -oac copy -ovc lavc -lavcopts vcodec=mpeg4:vhq:vbitrate=800:vpass=1 -o /dev/null mencoder <source> -oac copy -ovc lavc -lavcopts vcodec=mpeg4:vhq:vbitrate=800:vpass=2 -o <dest>