[theora] Additional encoding options for theora

[Benjamin M. Schwartz]

Basil Mohamed Gohar wrote:
> Not sure how to do
> accurate quality comparisons automatically, so that may be a manual
> process.

The libtheora repository includes a tool called dump_psnr, which provides
a simple, precise measure of how much error a Theora file has relative to
the YUV original.  It's not a perfect representation of subjective
quality, but it has the advantage of being reproducible and comprehensible.

--Ben

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