[Ffmpeg-devel] size of encoded file not continous parameter of 'vqscale'

[Jeff Clagg]

On Fri, Jun 09, 2006 at 11:39:05AM -0700, Roman Shaposhnick wrote:
> On Fri, Jun 09, 2006 at 09:07:19AM -0500, Jeff Clagg wrote:
> > On Fri, Jun 09, 2006 at 01:02:09PM +0200, Darko Veberic wrote:
> > > hi,
> > > 
> > > i am usually encoding video with the following mencoder options:
> > > -lavcopts vcodec=mpeg4:vqscale=$vq:vhq:v4mv:trell:autoaspect:threads=4
> > 
> > This isn't what you asked, but vhq isn't a good idea. Replace it with
> > mbd=2, and you will get better quality for a neglible speed difference.
> > I've actually seen a case where vhq was twice as slow as mbd=0, but vhq
> > gave slightly worse quality.
> > 
> > Also, threads=4 is only useful if you have around 4 CPUs. 
> 
>   Or 4 cores. Or 4 SMT capable Vcpus. It all depends, you know.
> 
> > And it causes a large reduction in quality.
> 
>   Care to elaborate ?

I was wrong. The quality reduction seems to be negligible. In the future
I'll stick to commenting on settings AFTER trying them.