[theora-codecs] setting things right (side up)

[Mauricio Piacentini]

Dan, apparently the flip is done on input and reversed on output depending
on the fomat,  in the vfwcodec.cpp layer code. See

vfwCodec::dx
vfwCodec::cx

I talked with Ralph and derf at irc, and apparently no one is really sure
the internal vp3 format is reversed, but I guess it is by looking at this
code snippet. Is there a reason for this? I know DIBs are upside down on
Windows, maybe that's the reason. I guess we should try to code the
transcoder to see what are the issues, but it is not a trivial task. I am
currently kind of busy, but will try to find some free time to hack an
avifile parser.

Regards,
Mauricio

----- Original Message ----- 
From: "dan miller" <danbmil99 at yahoo.com>
To: <theora-codecs at xiph.org>
Sent: Monday, June 23, 2003 2:26 PM
Subject: [theora-codecs] setting things right (side up)

<p>> since no one has responded on theora-dev, I'm posting this here
>
> Theora apparently does not invert the image like VP3.  This is bad because
we will not be able to
> losslessly transcode stuff from VP3 to Theora or vice-versa.  Can anyone
pinpoint where in the VP3
> logic the decision is made to scan the image from the bottom-up, so we can
diff it against the
> Theora code?
>
> thanks - dan
>
> __________________________________
> Do you Yahoo!?
> SBC Yahoo! DSL - Now only $29.95 per month!
> http://sbc.yahoo.com
> --- >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-codecs-request at 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/
To unsubscribe from this list, send a message to 'theora-codecs-request at xiph.org'
containing only the word 'unsubscribe' in the body.  No subject is needed.
Unsubscribe messages sent to the list will be ignored/filtered.