[Theora-dev] HD WMV9 videos for download...
chl at math.uni-bonn.de
Sun Sep 19 04:09:28 PDT 2004
On Sun, 19 Sep 2004, illiminable wrote:
> Came across this page... intended to showcase the high-end capabilities of
> Just thought some people might be interested in it to make some
> comparisons... and it's also probably some of the highest quality sample
> material i've found on the net...
The highest quality HD-material I know of (just test sequences, not
movie-like) are the 1080p/1080i//720p HDTV-test clips available at
It's uncompressed YUV 4:2:0, which is a major difference to all other
HD-sources I know of, because high frequencies aren't quantized away.
It's amazing how bad codecs start to behave if you feed them with
uncompressed input instead of the typical DVD-"quality" VOBs.
> so it's also useful for me to use as
> source material for testing high res transcoding in theora... and 6 channel
> audio in the highest res.
I did some transcoding testing with those for XviD a while ago. It's
rather easy to recompress at much lower bitrate at no real visible
differences. I guess that's because WMV is somewhat close to MPEG-4, and
in particular, these WMV files are intended for HD-DVDs and not tweaked to
get the most out of the bitrate. So, if Theora performs well, that's a
good sign, but don't get too excited.
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