[theora-dev] encoder_example input formats

[Felipe Portavales Goldstein]

If mplayer is abble to decode videos in the format mjpegb, yuvj422p,
you can use the command below to convert to yuv4mpeg (4:2:0) format.

mplayer -vo yuv4mpeg

You cannot escape the loss you will have converting form mjpegb, to
yuv4mpeg if you want to encode a theora stream.
Internally the codec works only with 4:2:0 format. Even if the
encoder_example accept any other format, sometime internally it will
have to convert to the 4:2:0 format.


On 10/5/07, Unga <unga888 at yahoo.com> wrote:
>
> --- Ralph Giles <giles at xiph.org> wrote:
>
> > On Thu, Oct 04, 2007 at 09:20:56PM -0700, Unga
> > wrote:
> >
> > > Please forgive me if this offend people but it
> > seems
> > > ffmpeg2theora is a one-man work. I prefer a
> > serious
> > > tool for serious work from a community supported
> > > organisation like xiph.
> >
> > I certainly agree. The reason you don't see such a
> > tool
> > are two-fold.
> >
> > 1) It has so far been *less* than one man working on
> > such
> >    a thing. Thus ffmpeg2theora is the best general
> > option,
> >    despite being a "one-man work". This is also not
> > strictly
> >    true since ffmpeg has an active community of
> > developers,
> >    and this the the complex part of the tool.
> >
> > 2) The vast majority of video formats people want to
> > encode
> >    from are patented, and as such Xiph cannot
> > provide an
> >    official tool which supports them. MJPEG is on of
> > the
> >    few exceptions to this, of course.
> >
>
> Ralph Giles, thanks for the reply. Hmmm...I think I
> forgot the patent issue. May be its because my focus
> was converting raw video footage to Theora.
>
> Another reason I worried was whether the ffmpeg2theora
> converts the camera raw video to some lossy
> intermediate and then convert from there to Theora. If
> that is the case, its a double loss, final video may
> not be as clearer as a direct conversion.
>
> Anyway, congratulations for the Theora beta1. Hope to
> see the v1.0 soon.
>
> Best Regards
> Unga
>
>
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-- 
________________________________________
Felipe Portavales Goldstein <portavales at gmail>
Undergraduate Student - IC-UNICAMP
Computer Systems Laboratory
http://www.students.ic.unicamp.br/~ra023772/