[MPlayer-users] probably my usual stupid question of the week
lorenm at u.washington.edu
Fri Apr 16 21:51:15 CEST 2004
On Fri, 16 Apr 2004, Aaron Peterson wrote:
> > Rescaling is the only way that most players understand... If you want
> > to keep the original size you'll have to use insanely high bitrate
> > anyway.
> The only reason I would want to keep the original size is to have a nicer
> finished movie by preserving information. If that requires an
> unreasonably high bitrate though to look nice, it sounds like you're
> saying I would perhaps get more of what I'm looking for by scaling down
> though. I generally wouldn't want to go over two 700 M cds worth of
> finished video, and have been encoding original size at
> vbitrate=1200-1800. These look fair, but still show some obvious defects.
> Especially when there's lots of movement with lots of varied color. I'll
> have to experiment and see what I see. What is an insanely high bitrate
> by your definition? I watch these movies mostly on a 30" widescreen tv.
> That seemed relevant for some reason.
> On a related note, I've been using -ovc frameno (and deleting the
> resulting file) just to find out what bitrate mencoder thinks I can encode
> and stay under the 700M limit. If I scale down, I assume this will result
> in a smaller video file. Can I use -vf crop=blah,scale=blah with -ovc
> frameno to make it take those things into account?
Bitrate is bits per time. It depends only on total movie length and total
file size, not on resolution or video filters.
Scaling down will produce a smaller file only if you encode at constant
quantizer. If you use 2-pass or abr, then it will affect quality but not
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