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Extra "lead-in" fraction of a sec. converting FLAC to MP3

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  • GiacomoGo
    • Aug 2006
    • 48

    Extra "lead-in" fraction of a sec. converting FLAC to MP3

    I have my CD collection backed up to FLAC files, and create/re-encode my MP3 collection from these. Part of MP3 management includes merging separate tracks into logical "medleys" -- think last half of Abbey Road, where I'll combine source FLACs into a single MP3 so I can listen to Golden Slumbers, Carry That Weight, ... uninterrupted.

    I use dbMC to rip the FLACs and convert them to MP3. I'm using Audacity to merge tracks, since dbMC still has not "merge" function.

    [COLOR="navy"]What I find strange [/COLOR]is that the convert-to-MP3 adds some sort of "lead-in" of a fraction of a second, which does not appear in the FLAC (see screenshot, below, with this extra mp3 "lead-in" highlighted).

    http://rapidshare.com/files/357996364/MP3_lead_in.png

    The result, when I combine the MP3 tracks is an audible disruption, which I do not get, obviously, if I combine the FLAC versions instead.

    Where's this MP3 lead-in coming from? Can I avoid it through some setting that I don't see?

    Just curious. Seems like I'm missing something.
  • Spoon
    Administrator
    • Apr 2002
    • 44000

    #2
    Re: Extra "lead-in" fraction of a sec. converting FLAC to MP3

    That is mp3 for you, unless your decoder knows of the encoder used and compensates you will get a small section of silence at the beginning of mp3. You can use dbpoweramp to convert the mp3 >> wave, then look at it, dbpoweramp decodes mp3 sample perfect.
    Spoon
    www.dbpoweramp.com

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    • GiacomoGo
      • Aug 2006
      • 48

      #3
      Re: Extra "lead-in" fraction of a sec. converting FLAC to MP3

      Originally posted by Spoon
      That is mp3 for you, unless your decoder knows of the encoder used and compensates you will get a small section of silence at the beginning of mp3. You can use dbpoweramp to convert the mp3 >> wave, then look at it, dbpoweramp decodes mp3 sample perfect.
      Thanks, Spoon. I've viewed the .wav from mp3 -- it's exactly as you explained and back to looking like the FLAC. Curious mp3 trivia, that little nugget. Thanks for explaining.

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