[theora-dev] VP3 Compressor Settings

[Thomas Tomiczek]

They are wrong - once you loose one interim frame, the image turns so
bad that it is unusable, which basically prooves that delta frames are
dependant on each other :-)

Thomas Tomiczek
THONA Consulting Ltd.
(Microsoft MVP C#/.NET)

-----Original Message-----
From: Oliver Darvall [mailto:oliver at cura.co.za] 
Sent: Dienstag, 10. September 2002 11:16
To: theora-dev at xiph.org
Subject: [theora-dev] VP3 Compressor Settings

<p>Hi Guys,

I was wondering what the idea behind the "Key Frame" settings are in the
VP3 codec settings. As far as I could ascertain (from browsing through
the source code) the VP3 codec ignores the lpbiPrev and lpPrev members
of the ICCOMPRESS structure.

My conclusion is thus that each frame passed to the codec is compressed
individually and that the redundant information based upon previous
frames is not relevant to this codec (i.e. the codec does frame for
frame compression much like a Wavelet compressor and not like an Mpeg
base compressor).

Is my assumptions at least correct ? Because it does not seem that any
changes to the Key Frame settings, or specifying previous frame, etc has
any influence on the resultant frame sizes. The only setting that does
seem to make a big difference is the BitRate and Quality settings
(obviously).

Regards
Oliver

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