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

[Ribamar Santarosa de Sousa]

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?

Thanks for bug reporting.

On Fri, Feb 29, 2008 at 3:44 PM, Manuel Dahmen <manuel.dahmen at gmail.com> wrote:
> On Fri, 29 Feb 2008 09:55:22 -0800
>  Ralph Giles <giles at xiph.org> wrote:
>
>  > On 29-Feb-08, at 2:19 AM, Manuel Dahmen wrote:
>  >
>  > > And when I play the movie with mplayer or totem, the video
>  > > resolution is changed from 640x480 to 854x480 (when i use
>  > > ETHEORA_ASPECT_NORMAL in etheora_enc_setup).
>  >
>  > This is a bug in etheora. It's passing the frame aspect ratio where
>  > libtheora expects the pixel aspect ratio, which is why it looks
>  > stretched.
>  >
>  > For 640x480 computer-sourced video like processing produces, the
>  > pixels are square anyway, but ETHEORA_ASPECT_PRESERVE is
>  > unfortunately also wrong (it sets a square frame aspect ratio). So
>  > you'll just have to wait until the bug is fixed.
>  >
>  > (if you want to hack it, change the default aspect_numerator and
>  > aspect_denominator in etheora.c to 1 and use ASPECT_PRESERVE.)
>  >
>  >   -r
>
>  Thank you, -r.
>
>  I'll take a look at etheora.c and try to find a solution.
>
>  Bye.
>
>
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>
>  --
>  Manuel Dahmen
>
>
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