[MPlayer-users] Mencoder quality help

[D Richard Felker III]

On Sun, Jun 08, 2003 at 09:40:34PM +0800, Neilen wrote:
> [Automatic answer: RTFM (read DOCS, FAQ), also read DOCS/bugreports.html]
> Hi
> 
> On Sun, 2003-06-08 at 06:57, D Richard Felker III wrote:
> > [Automatic answer: RTFM (read DOCS, FAQ), also read DOCS/bugreports.html]
> > On Sat, Jun 07, 2003 at 07:26:20PM +0800, ephemeron at softhome.net wrote:
> > > [Automatic answer: RTFM (read DOCS, FAQ), also read DOCS/bugreports.html]
> > > On Fri, 06 Jun 2003 01:41:46 -0700,
> > > Corey Hickey wrote:
> > > 
> > > [...]
> > > 
> > > > For "hard-telecined" content, Rich's detc and ivtc filters can
> > > > help immensely. For more information, read the manual and
> > > > search the mailing- list archives.
> > > 
> > > I could never get the audio to sync when using three-pass
> > > encoding.  Does the filter require some tricks?
> > 
> > You cannot use inverse telecine with 3pass. Ditch the frameno.avi
> > prepass (which doesn't work because the video isn't decoded and passed
> > thru ivtc) and just do a 2pass video encode.
> 
> I have been able to do three pass w/o any sync problems, even in the
> face of inverse telecine.  I had sync problems, untill I added -mc 0
> (ie. ditch any audio sync correction) to the command line.  I don't know
> if its neccesary, but I added it to all three passes.  This is in
> comibination with -ofps 23.976

I'm extremely skeptical of this combination. In fact, I'm not even
quite sure what it will do, but I can think of several nasty
possibilities:

1) Break A/V sync unless the telecine pattern is perfect or you use
   mode dr=2 with vf_detc.
2) Cause frames to be dropped without even passing them to vf_detc or
   vf_ivtc, in which case the inverse telecine will NOT do its job
   right.
3) ???

In any case, I don't see how it can do anything "right", so if it
worked, you just got super-lucky...

Rich