[MPlayer-users] mbd, vqscale, and vpass mechanisms
neltnerb at neltner.mit.edu
Sat Jan 3 21:19:37 CET 2004
I remember a discussion a while back about vqscale, but I don't believe
a conclusion was ever really reached. Anyway, I have a few questions
about these mechanisms in the encoding process.
What I have typically been using as a command line to encode a dvd is:
mencoder dvd://1 -o movie.avi -oac lavc -ovc lavc -alang en -lavcopts
vcodec=mpeg4:acodec=ac3:vqscale=3:mbd=1 -vf crop=<foo> scale=<foo>
I figure that this will give me a constant quality of 3, which is pretty
much unnoticable, use the "vhq" method, which is the best quality
encoding, and the size will be whatever is required to get the necessary
I don't see why people use 2-pass encoding with vqscale, basically. If
you're encoding at a constant quality, how does getting information
about the bitrates help the encoding quality? Should I be doing this
differently to get a better overall movie, or am I misunderstanding the
way that vqscale works with vpass? Also, mbd has three options, and I
don't really know which is the "best" in terms of quality.
Perhaps we should update the encoding-tips.txt file on the mplayer user
site at some point, I think it's getting outdated.
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