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Subject: Re: MPEG Audio format

Re: MPEG Audio format

From: Bluechip <>
Date: Sat, 14 Jan 2006 19:42:05 +0000

>>Pretty much got a proper core written for an Audio file processor now.
>>I have another simple question about MPEG Audio files.
>>Am I ever likely to encounter an MPEG Audio file which will contain AUDIO
>>frames which differ in VERSION, LAYER, SAMPLERATE and/or CHANNELS? Eg.
>>Some frames are 48KHz and other frames are 44.1KHz ...or some frames in
>>Stereo, some in Joint-Stereo?
>>I have been unable to find any documentation which explicitly states
>>whether this should or shouldn't be allowed by the MPEG standard, and
>>nothing to say explicitly whether any players do or don't support this
>>type of change.
>>There is no reason why not, the file would have a valid structure - but
>>it seems unlikely.
>>This is relevant to creating the Xing/Xing or Xing/Info frame for VBRFix.
>>Thanks for any help,
>Looking through the setup in Razorlame (a lame frontend for windows) there
>is the ability to allow different 'block' sizes between channels, although
>this is generally disabled. Another option give the ability to disable
>using 'short blocks', suggesting that the default is to allow them. Having
>stated this, I'm not too sure exactly what they are refering to with the
>term 'blocks'. It may mean the same as frame but I don't know.

Thanks, I too use razorlame, and also have no idea what short or long
blocks are - and google isn't helping much either. LOL

Received on 2006-01-14

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