[MEncoder-users] lavc option nr

[Rich Felker]

On Tue, Jun 21, 2005 at 11:13:00AM +0200, Jan Paul Schmidt wrote:
> 
> Am 21.06.2005 um 07:24 schrieb Rich Felker:
> 
> >(S)VCD sucks bad and requires very constricted bitrates. Thus
> >constant-qp is not an option, and 2pass is very wasteful.
> 
> What do you mean by wasteful? I do get better results on a SVCD with 
> two passes, which did not suprise me up till now, because it uses MPEG2 
> VBR.

The second pass can only give slightly better results, since SVCD
requires a rather tightly constrained bitrate. Perhaps you're
violating the spec and taking advantage of the fact that your player
will accept out-of-spec streams, but then it's not appropriate to call
it SVCD...

> >For what it's worth, I always had this "pump effect" problem even
> >without nr. My solution was:
> >
> >-lavcopts vi_qfactor=0.1:vi_qoffset=1.5
> >
> >Basically this just forces all I frames to have qp around 2-4. :)
> 
> That sounds nice :o) Thanks, this is something I was looking for.

No prob.

Rich