[theora-dev] Fast quality reduction transcoding
tstarling at wikimedia.org
Wed Aug 29 08:23:37 PDT 2007
After a quick read of the Theora spec, I became curious about the
possibility of fast quality reduction of Theora videos. The idea is to
decode through the Huffman and reverse prediction steps, and then to
truncate the coefficients and reencode. My questions are:
* Is this a reasonable way to reduce the quality and bitrate of a
stream? Will it be comparable in quality to a complete decode to YUV and
re-encode at similar bitrate?
* Will it indeed be much faster than a complete re-encode?
* How hard a task would it be to develop?
The application would be to have users upload high quality Theora videos
to our website, and then to offer a selection of bitrates for download.
-- Tim Starling (Wikimedia Foundation)
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