[MPlayer-users] bug in libpostproc/fv_pp [was Re: Problem With MPlayer v0.90rc3 + DV Avi files + Deinterlacing]

[D Richard Felker III]

On Wed, Jan 22, 2003 at 02:12:36AM -0600, Angel wrote:
> [Automatic answer: RTFM (read DOCS, FAQ), also read DOCS/bugreports.html]
> > I've tried encoding a couple of dv avi files with mencoder using the 
> > following 
> > command: 
> 
> > mencoder dvavifile.avi \
> >         -vc ffdv \
> >         -aspect 4:3 \
> >         -vop crop=624:480:12:1,scale=642:-2,pp=lb \
> >         -zoom \
> >         -oac mp3lame \
> >         -ovc lavc \
> >         -lavcopts vcodec=mpeg4:vqscale=3:vhq \
> >         -o movie.avi
> 
> > The resulting file looks like black and white with some color strips mixed
> > in. If I remove the pp=lb post processing filter - the file looks normal 
> > (color wise). Also, if I use either libdv or qdv for the codec mencoder 
> > segfaults immediately. I've tried the latest cvs version - same problem. 
> > Everything worked fine prior to v0.90rc3. If you need me to to fill out a 
> > full bug report / upload files etc.. just say the word.
> 
> I've traced the source of the problem to a change that was made between the 
> cvs snapshots MPlayer-20030105 and MPlayer-20030106. In the file 
> libmpcodecs/vf_pp.c starting on line 72 - 3 new image formats were added: 
> IMGFMT_444P, IMGFMT_422P, and IMGFMT_411P. If I remove those 3 lines the 
> problem goes away. Maybe someone else can suggest a proper fix.

A temporary workaround would be:

  -vop crop=624:480:12:1,scale=642:-2,pp=lb,format=yv12

to force the DV decoder to output yv12 instead of 411p. However, this
may reduce quality. Apparently the postproc filters *don't* support
411p, but they think they do, so that's causing the bogus output.
Someone should check into this.

Rich