[vorbis] Format converters

[Myles Buckley]

>> IF you can't get around re-encoding (it is not possible to "translate"
>> the audio files from one format (e.g. Vorbis) to another (MP3) without
>> loss), reencode as few times as possible. This applies to *all* lossy
>> codecs - none that I know of can be transcoded into each other (when I
>> say "transcode" i mean the lossless translation from one format into the
>> other ... others use it for "re-encoding", so there might be some
>> confusion).
>> 
>
>On a totally unconnected note....is it not possible
>to convert from mp3 to vorbis without leaving the
>frequency domain? That would imply much less loss
>then converting mp3->wav->ogg.
>

It may be possible to transcode SOME of the information entirely 
within the frequency domain, howevery when you consider transient 
sounds, it not be possible due to the fact that transients that 
exist in the time domain appear continuous in the frequency 
domain and vice-versa. Add in the short-block to long-block 
detection in MP3 with its poorly overlaped frames and I do not 
even want to consider attempting using it as a pure frequency 
domain source.

Myles

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