[MPlayer-users] mencoder with Xvid not very fast

[Green, Shaun]

> > here my line of order: 
> > 
> > mencoder  -ovc xvid -o test.avi -vop pp=0x20000,crop=720:432:8:71 -tv 
> 
> This is bad. Postprocessing should always be done before cropping
> unless you really know what you're doing. Remember, -vop filter order
>
>it depends. as you can see he does only deinterlacing, it's ok (and not
>only
>ok, but faster too) after crop (but NOT ok after scaling!).
>
>A'rpi / Astral & ESP-team


I need a little help understanding something here. I realize the order of
the vop filters is important and that it starts at the end of the command
and it executes them in the left direction. So here's the 2 cases I'm
questioning;

A) mplayer ... -vop scale=<params>,pp=lb,crop=<params>

B) mplayer ... -vop crop=<params>,scale=<params>,pp=lb


Would these both produce the same QUALITY encoding assuming the params were
setup so that the final AVI size was EQUAL in both cases?

I've always believed they would but someone told me that case B) would
always have worse quality.

I realize that case A) should be faster, but I prefer to scale first because
it's easier to get the correct aspect ratio.
                                
       ( O O )                 .".
 --oOOo--( )--oOOo-------------/V\---
 Shaun Green                  // \\
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 shaun.green at msfc.nasa.gov    ^'~'^