[MPlayer-users] parameters to record from analog capture card

[RC]

On Thu, 11 Feb 2010 02:09:21 -0800 (PST)
Andrew Daviel <advax at triumf.ca> wrote:


> This seems better :
> $ mencoder -tv input=1:norm=NTSC:driver=v4l2 \
>   -oac mp3lame -lameopts cbr:br=64 -ovc lavc \
>   -lavcopts vcodec=mpeg4:vbitrate=900 -vf pp=lb,crop=640:464:0:4 \
>    -o foo.avi tv://

Well, at least you're trying...  You'll want aspect=4/3 to make the
picture non-horrendous.  Also, with movies and animation, you'll want
pullup before your deinterlacer at a minimum.

Sooner or later you'll discover setting a bitrate is a bad idea, as a
fast scene leaves the video looking horrible for *minutes*.  vqscale can
work, or perhaps a very large large vratetol=.  

> Is there anything to be gained by capturing in MJPEG or raw
> format then doing a 2-pass MPEG conversion offline ?

Plenty.  See pullup vs. interlacing (can't always be guessed
before-hand), and much higher quality at a given bitrate thanks to
2-pass, and other quality-improving options like mbd=2:trell, etc., etc.
which your PC may not be fast enough to do in realtime.


-- 
Ha. I'm the idiot.