[MEncoder-users] conversion to mpeg2 VideoDVD

[Jeff Clagg]

On Wed, May 09, 2007 at 09:47:47AM +0200, Levente Nov?k wrote:
> On Tue, 2007-05-08 at 23:10 +0200, Nico Sabbi wrote:
> > Andriy Babiy wrote:
> > >>Please try a lower vbitrate and vrc_maxrate.
> > > 
> > > 
> > >>probably you should add :vstrict=1
> > > 
> > > 
> > > Thank you guys, I'll try it.
> > > So you think it has nothing to do with the color conversion or mapping. 
> > > It's good because I know little about the topics :-)
> > > 
> > > Andriy
> > 
> > there's another thing that is obviously wrong: dc=11. only dc=8 is 
> > allowed in the standard (hearsay, of course)
> 
> Yes, but encoding-guide (in the DOCS directory) says:
> 
> "Also, if you are trying to make a very high quality DVD encode, it may
> be useful to add dc=10 to lavcopts.
> Doing so may help reduce the appearance of blocks in flat-colored
> areas."

I'm to blame for that. A big part of my thinking was that it'd help
prevent people from complaining about "undersized" encodes. I am pretty
sure dc=10 is supported by the dvd spec; dc=11 is (to my memory) maybe
not supported; both are hard to justify for ordinary use as they
increase bitrate significantly for such a tiny quality improvement. On a
side note, setting vbitrate=9500 is probably too high for almost all
reasonable purposes and I agree with the earlier comment that it's
asking for trouble in light of lavc's occasional problems with
respecting vrc_buf_size.