[Theora] Losslessly manipulating Theora

blibbler blibbler at gmail.com
Wed Aug 24 09:32:37 PDT 2005

On 23/08/05, Ole Tange <ole at tange.dk> wrote:
> On Tue, 23 Aug 2005, Michael Smith wrote:
> 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?

You might be able to rotate the image 90 degrees losslessly, but you
definately can't crop it losslessly. This is because p-frames refer to
previous frames, and they might refer to the parts of the previous
frame that has been cropped.

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