[theora] Re: Quicktime Vs Windows encoding with VP3

[Dan Miller]

the OV codecs you refer to are some Vorbis ACM's that I hacked up to get VPVision to work.  Among other sins, they pad out the datarate to allow seeking, since normally AVI files can't deal with variable-bitrate audio.  Don't use these codecs for anything but VpVision, please!
 
Anyway, I cannot say why QT compressions take longer.  Maybe something to do with QT itself.  

        -----Original Message----- 
        From: Jim Barnes [mailto:tojimbarnes at hotmail.com] 
        Sent: Sat 10/19/2002 4:08 AM 
        To: theora at xiph.org 
        Cc: 
        Subject: Re: [theora] Re: Quicktime Vs Windows encoding with VP3
        
        

        Okay  sorry I dont know enough about VBR etc yet but I got that
        
        This is how I came to have the OV codec in win2000
        There are three dls at On2  for VP3-Theora on a PC
        One for Avi, One for QT, and one comes with VP vision.
        When I installed the last of these I suddenly got OV1 2 and 3  as a
        selection in the audio codecs in all my editors.
        
         I assume from what you say then that this is an audio only codec and should
        only be used as such.
        
        Its just strange that they are in there and they work or at least thats what
        the summary of the file under win2k shows. The file shows OV as the audio
        codec and VP3 as the video codec.
        
        The interleave was set to one frame and I have no sync problems, just a file
        thats bigger when I expected it to be smaller
        
        I used FlaskMpeg to encode both the files
        
        Jim
        
        
        ----- Original Message -----
        From: "Christian HJ Wiesner" <cwiesner at t-online.de>
        To: <theora at xiph.org>
        Sent: Saturday, October 19, 2002 5:45 PM
        Subject: [theora] Re: Quicktime Vs Windows encoding with VP3
        
        
	> There is no 'allowed' way of using Vorbis within AVI, because ACM audio
	> codecs are only allowed to be CBR, not ABR/VBR. There is a modification of
	> Virtualdub called 'nandub' that can mux Lame MP3 VBR/ABR strams into AVI,
	> but it breaks AVI specs, playback works only on Windows using MP3 Dshow
	> filters and in mplayer for Linux, all other players on most other OSes
        failt
	> to keep audio and video in sync AFAIK.
	>
	> There was a Vorbis ACM codec floating through the net some time ago, some
	> guys reported it works with AVI, but quality is bad and there are severy
	> sync problems.
	>
	> Please note that the inability to use Vorbis in AVIs was one of the main
	> reasons for some projects to start work on replacing AVI with something
        more
	> modern, namely the OGM format made by Tobias Waldvogel ( based on Ogg
	> framing ) and MCF.
	>
	> Christian
	>
	>
	>
	>
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