[MPlayer-dev-eng] [PATCH] synch to new x264 revision

[Jeff Clagg]

On Thu, Sep 23, 2004 at 02:36:07PM -0700, Loren Merritt wrote:
> Also, in both H.264 and MPEG4, it seems to help global PSNR to use 
> slightly lower quantizers on I-frames than on P. This may cause a visible 
> jump in quality at low bitrates, if the I-frame is in the middle of a 
> low-motion scene.

I keep ip_factor low for clips with few scene changes, and keep it higher
for clips with more frequent scene changes.

Changing the subject to reasonable defaults:

[about iframe interval]
> >So I guess setting it to 250 and higher should be ok then? ...
> 
> Yes.

I think the default should be set to 250, or maybe even higher. The other
default that needs to be changed is cabac. It should be on by default,
and a "nocabac" flag should be available instead. These two changes will
improve quality for first-time users with no real downside.