[theora] Poor encoding quality with etheora and aspect ratio problem

[Manuel Dahmen]

On Sun, 9 Mar 2008 14:04:49 +0100
Manuel Dahmen <manuel.dahmen at gmail.com> wrote:

> On Sun, 9 Mar 2008 04:00:14 -0300
> "Ribamar Santarosa de Sousa" <ribamar.santarosa at gmail.com> wrote:
> 
> > Manuel,
> > 
> > can you test the version in
> > http://svn.xiph.org/experimental/ribamar/etheora/ ?
> > 
> > The final resolution (Fr) shown by  the mplayer output is the video
> > frame resolution (fr) multiplied by the Aspect ratio (Ar):
> > 
> > Fr = fr * Ar. This should be the 16:9 or 4:3 final visual you
> > probably expected to see shown by  the mplayer output. Etheora was
> > doing:
> > 
> > Ar = fr, what led to problems. Now etheora does:
> > 
> > Ar = Fr / fr,  which I expect to led to the correct values, but I
> > may have missed any test. Can you see (and report) if now it's
> > working?
> 
> 
> I ran some tests this morning with the new version.
> 
> What I was doing  before in my source code is adding this code between
> enc_setup and enc_start:
> 	ec->ti.width=width;
> 	ec->ti.height=height;
> 	ec->ti.frame_width=width;
> 	ec->ti.frame_height=height;
> 	ec->ti.aspect_numerator=1;
> 	ec->ti.aspect_denominator=1;
> 	// So I keep the original resolution when playing, with square
> 	//pixel ratio (for drawing shapes in processing.org).
> 
> Here is mplayer output (file are named
> "movie-{ASPECT_CONSTANT}-WIDTHxHEIGHT" where width and height are the
> values passed in etheora_enc_setup. I commented these lines for the
> tests below. I put the resulting videos here :
> http://poux.be/tmp/video__test21/

I'm sorry there was a stupid error in index.php, making the script
looping again and again... I corrected the mistake.