[theora] CPU saving way to lower quality of Theora stream

Ralph Giles giles at thaumas.net
Tue May 17 22:51:03 PDT 2011

On 17 May 2011 22:39, fboehm <fboehm at aon.at> wrote:

> A somehow related question to this topic:
>     Is it possible to modify the encoder to output streams with
> different quality (low, mid, high bitrate) simulatenously without
> needing 3 times CPU time? The three streams should perhaps also differ
> in resolution and not only bitrate.

Not really. This is simillar to the problem of trying to requantize
the stream. You could reuse some of the analysis i suppose, but when
you change the rate and dimensions you end up making different coding
decisions and the streams would diverge quickly.

One thing you can do is reuse the first-pass complexity analysis data
for multiple second-pass encodings at different rates. That will some
some time.


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