[Mplayer-advusers] bug in mencoder - divx5-encoderandlibavcodec-encoder

[Onno]

Hi,
[...]
> i've uploaded two other files: test2.vdr und test2a.vdr
> 
> they are from the same video. before you see "jetzt" in the video there
> is change in the aspect ratio. test2a.vdr starts later, after that
> change, so you see a different format when you play both.
> 
> when you try to encode such a video with a change of the aspect ratio
> the
> 
> 1) libavcodec encoder stops working here and mencoder stop (now without
> crashing)
> 2) divx5 encoder cannot encode the 2nd pass.
> 

thats a known limitation of the avi file format when used with mpeg2
input files, AFAIK the aspect (encoded into the mpeg2) is used to make
up the data which goes into the avi header, thus mencoder fails, when
it detects an aspect change with in the video, making the current avi
header invalid, although this might be unnecessary i heard about it
before.

perhaps you could try to set the aspect manually (-aspect 16/9),
preventing mencoder from detecting any change, but that's a guess,
since i use vdrsync.pl before converting i don't have such problems.

Regards Onno