[x264-devel] Theora Ahead of H.264 In Objective PSNR Quality

[Panagiotis Issaris]

Hi,

On Thu, 2009-05-07 at 20:57 -0700, Jason Garrett-Glaser wrote:
> On Thu, May 7, 2009 at 7:25 PM, Jason Garrett-Glaser
> <darkshikari at gmail.com> wrote:
> > On Thu, May 7, 2009 at 6:30 PM, Jason Martens <cacepi at gmail.com> wrote:
> >> From Slashdot:
> >>
> >> http://tech.slashdot.org/article.pl?sid=09/05/07/2352203
> >>
> >> Let the debunking begin!
> >
> > Apparently they seem to have used catastrophically bad settings for
> > encoding.  I'm going to guess they just encoded idiotically with
> > ffmpeg without using any presets, thus using ffmpeg's quite broken
> > defaults.  I suspect this is entirely intentional.
> >
> > It isn't worth spending time "debunking" though; anyone dumb enough to
> > actually believe such a thing deserves the godawful quality Theora
> > will give them.  And when they get that godawful quality, if they are
> > still dumb enough to not realize they've been scammed by Xiph, they
> > deserve every last bit of suffering they will experience.
> >
> > Dark Shikari
> >
> 
> And it turns out the problem was a bug in ffmpeg when writing the y4m
> file prior to PSNR measurement, cutting a nice 4db off of x264's
> score.

Just out of curiosity, do you have a link to any info regarding this
bug? I've been looking at ffmpeg-cvslog and am on the regular
ffmpeg-devel list and haven't found it. Was it discussed on IRC or
somewhere else?



With friendly regards,
Takis