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OpenDivX digest, Vol 1 #50 - 2 msgs

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Today's Topics:

   1. OpenDivX Encoder -> OpenDivX Daily Forums Digest (Darrius "Junto" Thompson)
   2. Help with DivX integration (=?iso-8859-1?q?A.=20Schirmacher?=)


Message: 1
Date: Wed, 4 Apr 2001 09:05:40 -0700
From: "Darrius \"Junto\" Thompson" <[email protected]>
To: <[email protected]>
Subject: [OpenDivX] OpenDivX Encoder -> OpenDivX Daily Forums Digest

Topic:		now I'm stumped
Author:		doom9
Posted:		 2001-04-03 15:13
Hi there

You might remember my earlier opendivx quality comparison
(http://www.doom9.org/opendivx.htm). I'm running another test now,
comparing many codecs and new encoding methods and I've come across
something which is really surprising. First of all I used the latest DS
filter with filtering turned up to the top. I kept the file I initially
made for the first quality check.. an 1800kbit/s file that is. Now I
created 2 new files: 900kbit/s and 6000kbit/s both at the default
settings (btw.. I miss some documentation on these settings . And guess
what... these encodings look good even in the scenes where my previous
articles showed the codec fail miserably.. so far I've only checked the
900kbit/s and parts of the 6mbit/s file but there's no problem I can see
so far. Then I went back to the 1.8mbit/s one and guess what.. it still
sucked. So I redid the clip.. and I just had a look at the scene with
the fast zoom into the weapon racks (4th screenshot in my article) and
that file still looks worse than both my 900 and 6000 kbit/s file.=20

Clearly.. the question to ask is "why?". I'd really appreciate if the
developers could get back to me on that issue.. I'll keep the 1.8mbit/s
opendivx on hold and work on the rest of the comparison but I think it's
an issue which deserves close attention.


Topic:		now I'm stumped
Author:		eagle
Posted:		 2001-04-03 15:49
So, OpenDivX at 900kbps looks better than 1800kpbs!?!? Just think how
good it would look at 0kbps!

Seriously though, this sounds like a quirk of the rate control.  Rate
control systems can be complex beasts and are often non-linear.  Is the
1800kbps clip consistently bad, or does it only look bad at the
particular frames that you are comparing?

We'll get to the bottom of this!

Topic:		now I'm stumped
Author:		doom9
Posted:		 2001-04-03 16:10
according to my impression I`d say that the 900kbit/s clip consistently
looks as least as well as the 1800kbit/s clip.. and the higher bitrate
one screws up pretty badly in all these scenes mentioned in my article
where the low bitrate clip (and the 6mbit/s clip) look good overall.

Topic:		New Codec On The Block (SBC)
Author:		Essbesteck
Posted:		 2001-04-03 17:16
I can't wait to test it! One question remains:

Does it work with DivX 3.2 (which seems to be some sort of hacked
'union' of FastM and LoM and has VKI, too)? Or do I have to go back to

BTW, it's great that we won't have to turn to M$'s dreadful WMV8 and its
utterly incompatible codec and encoder for true VBR two-pass encoding
now after all!=20




Message: 2
Date: Wed, 4 Apr 2001 09:02:59 +0200 (CEST)
From: "=?iso-8859-1?q?A.=20Schirmacher?=" <[email protected]>
To: [email protected]
Subject: [OpenDivX] Help with DivX integration

I would like to have DivX capabilities in my Kino
program (http://www.schirmacher.de/arne/kino/). Kino
is a small non-linear video editor program for Digital
Video (DV) camcorders.

The program can currently only save AVI files, but all
my users want mpeg format too. Unfortunately I have no
mpeg or divx related experience and only very little
time available. I would therefore appreciate it if
somebody could help me out. 

Inside the Kino code, I could supply 720*576 (PAL) or
720*480 (NTSC) pixels of YUV or RGB data and 48 kHz
audio in WAV format. This should go into a DivX writer

Please contact me at [email protected] or at my website,
if you are interested.


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