[vorbis-dev] ACM codec

[Dan Miller]

well I've had this discussion multiple times with Monty and others, and I am still of the same opinion:  by ignoring WAV and ACM (and by extension AVI format and VFW interface when Theora is done), we are in fact limiting (or at least delaying) 4our likely acceptance in the marketplace significantly.  Even though there may need to be some compromises, I think it would be wise to make a WAV/AVI/ACM/VFW set of components for Vorbis and Theora available.  There are ways to do it that provide at least one-way compatibility -- ie, you could take your AVI file and convert it to OGG, but not necessarily the other way around.
 
Failing this, we will need to work much harder to evangelize the OGG format, and to get the toolmakers to support OGG directly through our library interfaces.  

        -----Original Message----- 
        From: Vitaly Nechyos [mailto:nvit at open.by] 
        Sent: Mon 11/11/2002 9:25 AM 
        To: vorbis-dev at xiph.org 
        Cc: 
        Subject: Re: [vorbis-dev] ACM codec
        
        

        Good day.
        
        I think a valid wraping Ogg Vorbis format in WAV cover is not reasonable
        (even
        impossible). Off cause if Ogg Vorbis ACM codec will not require specific
        operation with it (but in this case it will not true ACM codec).
        The reasons:
        - wraping any VBR format in WAV cover is hard in principle (at least because
        of
        problems with determining file duration and positioning - try to encode
        something
        with the Ogg Vorbis ACM codec and open encoded file in WinAmp);
        
        As for particular Ogg Vorbis ACM codec:
        - it has manufacturer ID=0 (as i know
        there is a problem on NT system if there are several codecs with the same
        manufacturer ID); format tags (WAVEFORMATEX.wFormatTag) for the codec are
        unregistered and there is a probability, that you receive several formats
        with the same
        format tags installed.
        - you will have the problems with using "user comments";
        - you will have the problems with convertings "ogg" file<->"ogg - wav" file
        (it will
        be impossible without decoding);
        - you do not have all capabilities that Ogg Vorbis library gives (e.g.,
        quality
        managed encoding);
        
        It seems there is many other reasons.
        
        Vitaly.
        
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