theora - Mar 2005 - ffmpeg2theora with mmx patches is available on konvalo.org

Hello,

ffmpeg2theora (with encoder mmx patches) is available on konvalo.org.
You can run it on Linux (2.6.x), FreeBSD (5.x) and NetBSD (2.x) on Intel x86.

ffmpeg2theora may be considered the recommended Theora encoder.
The author of the program is Jan Gerber @ v2v.cc

Those of you who already use Konvalo.org do not need to do anything,
the program is in your PATH. Otherwise see
http://www.konvalo.org/?pagename=Main.Software

-------------------------------------------------------------
On Wed, Mar 30, 2005 at 10:46:04AM +0200, Ivan Popov
wrote:
> In contrast, ffmpeg2theora converts the image to square pixels before
> encoding to theora. That is a more straightforward approach,
The above is no longer correct. It has improved a lot since version 0.10
which I tested. Sorry for the stale information.

The current version (0.13) of ffmpeg2theora is capable of maintaining
the pixel aspect ratio properly. You supply the picture aspect and it
recalculates it to the pixel aspect ratio.

It contains also all of the frequently used functions needed by an encoder,
so you would prefer it to the theora-encoder script unless you need
sophisticated video filtering. Another reason to try theora-encoder
might be if your source data is in some exotic format which ffmpeg2theora
would not accept.

Noise filtering seems to be on the TODO list, so we can hope it will be
soon incorporated into ffmpeg2theora.

Enjoy,
--
Ivan

On Wed, Mar 30, 2005 at 09:02:25PM +0200, Ivan Popov
wrote:
> It contains also all of the frequently used functions needed by an encoder,
> so you would prefer it to the theora-encoder script unless you need
> sophisticated video filtering.
Looking at movies from Prelinger Archives, many of them are
telecined and interlaced.

ffmpeg2theora does not seem to do detelecining,
nor can mplayer do that (so it is impossible to supply the filtering args
to theora-encoder).

Good results at recoding to Theora can be achieved by consequent application of

 mencoder -vf filmdint -fps 29.97 -ofps 23.976 \
          [possibly more filtering] \
          -ovc lavc -lavcopts vbitrate=<a-high-bitrate> \
          [-ovc copy does not produce a valid result] \
          -o intermediate.avi \
           ...

 theora-encoder ... intermediate.avi

(ffmpeg2theora seems to have problems accepting the intermediate avi file
as input, the resulting sound is broken)

Do not forget -s and -S pixel aspect ratio options,
very often pixels are not suare.

Cheers,
--
Ivan

I like  konvalo.org coda client and I use it a lot on
my computer at home. Unfortunately I'm sometimes
forced to use other machines where I don't have
permission to install the coda client. Is there a way
to get those cool theora software on a konvalo FTP pub
or something?

Thanx in advance

Pat
--- Ivan Popov <pin@konvalo.org> wrote:
> Hello,
> 
> ffmpeg2theora (with encoder mmx patches) is
> available on konvalo.org.
> You can run it on Linux (2.6.x), FreeBSD (5.x) and
> NetBSD (2.x) on Intel x86.
> 
> ffmpeg2theora may be considered the recommended
> Theora encoder.
> The author of the program is Jan Gerber @ v2v.cc
> 
> Those of you who already use Konvalo.org do not need
> to do anything,
> the program is in your PATH. Otherwise see
> http://www.konvalo.org/?pagename=Main.Software
 



		
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> ffmpeg2theora (with encoder mmx patches) is available on konvalo.org.
> You can run it on Linux (2.6.x), FreeBSD (5.x) and NetBSD (2.x) on Intel
x86.
> 
> ffmpeg2theora may be considered the recommended Theora encoder.
> The author of the program is Jan Gerber @ v2v.cc
Running only on x86? Hardly.  Make it work everywhere, then maybe it
will be "considered the recommended encoder" :)

jack.