[MPlayer-users] video capture & .avi file "un-catenating"

[Alain Barthélemy]

Hi,

mplayer-1.0pre1
SuSE-8.2 Linux Kernel 2.4.20-4GB-athlon (AMD 2000MHz) 

I am no specialist of video capture. I spent two weeks reading
mailing-lists, manuals and examples. I finally ended up with the
following console instruction, not perfect but it works not too badly:

mencoder -tv
driver=v41:width=640:height=480:forceaudio:amode=(0|3):adevice=/dev/audio
-ovc lavc -lavcopts vcodec=mpeg4:vbitrate=***:vhq -oac mp3lame -lameopts
br=128:mode=(0|3) -vop lavcdeint tv:// -vf eq=**:** -o file.avi -endpos
hour:min:sec

Problem: with a vbitrate < 1000, the result is bad thus difficult to
capture more than 85 minutes if I want to burn the file on a CD-Rom.

I have read that it was possible to catenate files:

cat 1.avi 2.avi | mencoder -noidx -ovc copy -oac copy -o output.avi

Question1: is it possible to do the contrary thus to cut an .avi file
in two parts and how (like it is possible with .mp3 files)?

Question2: the above console instruction is surely not perfect. Any
commentary on the instruction is welcome. It is fairly easy to find
short elementary examples but no detailed explanations (apart manuals)
of the impact and use of each parameter. I even sea examples with
parameter like -npp unfindable in the man page. The -oac and -ovc
parameters are obvious but -vop less. Does a detailed tutorial exist?

-- 
Alain Barthélemy
cassandre at bartydeux.be
http://bartydeux.be
Linux User #315631