[Theora] ffmpeg2theora with mmx patches is available onkonvalo.org

Ivan Popov pin at medic.chalmers.se
Fri Apr 15 04:54:58 PDT 2005

On Fri, Apr 15, 2005 at 08:11:21AM -0000, Alen Ladavac wrote:
> While ffmpeg2theora is the topic... does anyone have some hints on which
> formats to use for conversion source (avi, mpeg, or what? which codecs?). A
> colleague of mine did some tests converting with ffmpeg2theora recently and
> we tried playing that back in our application, using theora reference
> decoder, but some of the files played back erratically. The library reported

ffmpeg2theora does not cope well with some wmv files (they report wrong fps).
It produces broken results even with manual fps setting.
IIRC then the only way to do a good theora movie is to use mencoder (to mpeg4
or alike), then theora-encoder script on the resulting file.
(ffmpeg2theora has problems even with that resulting intermediate file).

> that video bitrate was 0. Though it did play, it blocked on some frames,
> then ffwd-ed quickly etc. Does anyone know what may be the reason for such
> behavior?

Apparently either originally broken (non-conformant) files,
or bugs in the corresponding decoder library.

It does not seem to be related to theora.
(I saw reports on other, non-theora recoders breaking on such files,
"DRM in action?"...)

My 2c

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