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Convert M4P to MP3

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  • ChristinaS
    dBpoweramp Guru
    • Apr 2004
    • 4097

    #91
    Re: Convert M4P to MP3

    Originally posted by adaywayne
    How about going say M4P to WAV to MP3, w/same bitrate and everything? I'd think there's just gotta be a way to preserve quality converting in a digital medium!



    A bit off-topic but I loved Flanders and Swan. To get back on topic, Bill, try
    starting with an 8-bit, 22050Hz, mono wave file. Convert it to 16-bit, 44100, stereo and then convert that back to 8-bit, 22050Hz, mono. Now, repeat that process, listeneing to the mono file after each iteration. By the third time you should notice quite a difference. After 6 iterations it will sound horrible, and after 10 iterations it will be virtually unplayable (turn your speakers down first!)

    Happy festive season and healthy 2005 to all.
    Arnie
    Starting with mono and going to 2-channel stereo is no change at all, except for a second identical track being added (thus the file size doubles).

    Going from 8-bit to 16-bit is the bigger change and also from 22KHz to 44.1KHz. In fact 8-bit 22KHz straight to 16-bit 44.1KHz will more than likely result in a distorted audio file, if it doesn't bomb outright. It definitely does this very audibly for very short duration files. 8-bit to 16-bit and keep the frequency fixed will be ok. Thereafter change the frequency and again it will be ok. Mind you, all this is still palying with wav. If you introduce the extra challenge of working with compressed types, there's no telling what kind of result you'll have in the end. Easy does it, one changed parameter at a time for best results.

    As for the .m4p being converted to wav first, well, that depends on whether or not you can even break the protection. In that case it appears teh first conversion is to unprotected .mp4 foloowed by whatevr other conevrsions you like (say, to .wav).
    Last edited by ChristinaS; 12-20-2004, 07:14 PM.

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    • Spoon
      Administrator
      • Apr 2002
      • 43888

      #92
      Re: Convert M4P to MP3

      See here for m4p conversion FAQ:

      How to convert iTunes m4p to any other format Read this thread for latest information: http://forum.dbpoweramp.com/showthread.php?p=54918#post54918 ----------- This post is a synthesis of many made by Bill (Xoas (http://forum.dbpoweramp.com/member.php?u=12) ) after painstakingly reading and answering many forum
      Spoon
      www.dbpoweramp.com

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