theora - Mar 2003 - Blockiness

I tried out Theora to see what the future holds, and see some pros and cons.

As a great plus, I have noticed that, even at the lowest quality (ie.  "-v
0"),
the detail, and overally quality is clearly better than anything else available.

On the negative side, at qualities comparable to MPEG4, I've notcied a great
deal of blockiness.  It's not as bad as blockiness from other codecs, as the
macroblocks are much smaller, and the detail of the picture (ie. within the
macroblocks) is still quite good, but it's a very bad thing, and detrimental
to
the video just the same.  I am a bit concerned because I did not experience the
same issue with the handful of standard VP3 videos I've tried.  

Although I'm quite excited about Theora, I seriously hope that the problems
with
blockiness are either limited to the current alpha version, or that the possible
problem with be resolved before the beta release.  Blockiness is certainly the
bane of digital video, and I'm excited about Theora primarily because VP3
did
not show blockiness at even very low bitrates.
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I'm not sure about the status of the post-processor in Theora.  It's
possible that it's been disabled for performance reasons.

 ___  Dan Miller
(++,) Founder, CTO, On2 Technologies 
> -----Original Message-----
> From: rcooley@spamcop.net [mailto:rcooley@spamcop.net]
> Sent: Thursday, March 27, 2003 11:03 PM
> To: theora@xiph.org
> Subject: [theora] Blockiness
> 
> 
> I tried out Theora to see what the future holds, and see some 
> pros and cons.
> 
> As a great plus, I have noticed that, even at the lowest 
> quality (ie.  "-v 0"),
> the detail, and overally quality is clearly better than 
> anything else available.
> 
> On the negative side, at qualities comparable to MPEG4, I've 
> notcied a great
> deal of blockiness.  It's not as bad as blockiness from other 
> codecs, as the
> macroblocks are much smaller, and the detail of the picture 
> (ie. within the
> macroblocks) is still quite good, but it's a very bad thing, 
> and detrimental to
> the video just the same.  I am a bit concerned because I did 
> not experience the
> same issue with the handful of standard VP3 videos I've tried.  
> 
> Although I'm quite excited about Theora, I seriously hope 
> that the problems with
> blockiness are either limited to the current alpha version, 
> or that the possible
> problem with be resolved before the beta release.  Blockiness 
> is certainly the
> bane of digital video, and I'm excited about Theora primarily 
> because VP3 did
> not show blockiness at even very low bitrates.
> --- >8 ----
> List archives:  http://www.xiph.org/archives/
> Ogg project homepage: http://www.xiph.org/ogg/
> To unsubscribe from this list, send a message to 
> 'theora-request@xiph.org'
> containing only the word 'unsubscribe' in the body.  No 
> subject is needed.
> Unsubscribe messages sent to the list will be ignored/filtered.
> 
--- >8 ----
List archives:  http://www.xiph.org/archives/
Ogg project homepage: http://www.xiph.org/ogg/
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