[Theora] Losslessly manipulating Theora

Ole Tange ole at tange.dk
Tue Aug 23 01:53:28 PDT 2005

On Tue, 23 Aug 2005, Michael Smith wrote:

> On 8/23/05, Kyungjoon Lee <kjoonlee at gmail.com> wrote:
> > Hi,
> > 
> > Is it possible to cut Theora files into several pieces losslessly, at
> > arbitrary cutpoints? If yes, what tools are available, and which would
> > you recommend?
> You should be able to cut the file losslessly at arbitrary keyframes,
> but not at non-keyframes.
> I know of no software for doing this, though it wouldn't be too hard to write.

You can rotate JPEGs 90 deg losslessly (if the image is (n*16)x(m*16) 
pixels). I believe you can also crop JPEGs losslessly at 16 pixel borders. 
Will it be possible to do similar manipulation losslessly with Theora?

Free software gives you the freedom to:
* F orward copies to anyone
* R un the program
* E xamine the source code
* E nhance the source code

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