[MPlayer-users] Mencoder segfaults with DivX4

[Michael Niedermayer]

Hi

On Thursday 14 February 2002 22:44, René Bartsch wrote:
[...]
> > it doesnt need the size to be a multiple of 16, imho mpeg4 does support
> > odd sizes, but iam no sure
> >
> > > This is also for DivX 4.xx! If you use values not dividable by 16,
> > > there can  be a huge loss of quality.
> >
> > RTF(mpeg4 std) section 7.6.1
> > i dunno about divx4
>
> http://www.divx.com/support/guides/aspect_ratio.php?cid=1&gid=4

i fully agree that it is best to use a width & height which is a multiple of 
16 as otherwise u lose a small bit of screenspace as internally mpeg4 does 
use 16x16 macroblocks and if the width or height is not a multiple of 16 then 
the boundary macroblocks are simply not shown completly but they are complete 
internally, so it is a waste of bits but mpeg4 does support sizes which are 
not a multiple of 16 and indeed mpeg4 does even support non rectangular 
shapes but i dunno which profile that requires

[...]

Michael