[MEncoder-users] (work-in-progress) XviD encoding guide

[Rich Felker]

On Sat, Jun 25, 2005 at 03:23:31PM +0400, Vladimir Mosgalin wrote:
> > *(no)packed
> > One of best XviD features, frame swapping. If this is turned on, codec
> > will try to swap frames in order to get more quality. Price here is
> > DivX compatibility.
> > *(no)closed_gop
> > This option also may break compatibility. However, it may save a few bits.
> > 
> 
> One of this options (or both, don't remember) actually break lavc
> compatibility, it will display file with errors (maybe fixed in newer
> versions, but..). They may reduce file a bit, but it doesn't worth it.

It does NOT "reduce the file". All it does is store B frames in a
totally incorrect, broken way. FYI lavc does support this and has
since a long time ago, maybe always. But it still should not be used
because it's in violation of the mpeg4 spec. It was a stupid hack by
the divx people to deal with the fact that avi doesn't actually allow
B frames.

Rich