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Topic: Windows Utility to Split .m4b Files?

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Old 12-30-2004, 05:40 PM
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Question Windows Utility to Split .m4b Files?

Anyone know of a Windows utility that can split AAC files in M4B format without converting to another format, splitting & re-encoding the pieces?

I have a 3G iPod, so I don't have the 4G mono file lockup problem, but I do have problems with a few very large M4B audiobooks (>150 MB) that frequently halt playback and lose the bookmark, forcing me to scrub back to the previous listening point. I don't seem to have problems with "small" M4B files (under 100 MB or so). I seem to remember Parannoya stating that under 75 MB is safe.

All my "homemade" audiobooks in M4B format are encoded at low bitrates (slightly larger than Audible Format 3), but a few are very long, hence the large file sizes. Because of the low bitrate, if I convert to another format (huge WAV or MP3), split that file, then re-encode the pieces to M4B, the sound quality is terrible -- almost unlistenable. And I shudder at the thought of re-ripping 15-25 CDs per offending audiobook.

Thanks to anyone with some good advice to offer.

Last edited by jaydee; 12-30-2004 at 05:44 PM.
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Old 01-02-2005, 08:38 PM
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It's not MUCH of a suggestion, and clunky besides, but - why not just re-rip the last few CDs in the book, from the point on at which you are having problems listening?



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Old 01-02-2005, 09:33 PM
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Nom
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Audacity (http://audacity.sourceforge.net)

Just get the codecs/encoders you need and you're all set.

How to split an audio file (uses a .WAV as an example)
http://audacity.sourceforge.net/faq.php#a7

As far as getting support for the extension you want, I don't know offhand how to set it up. Search the FAQ.

Last edited by Nom; 01-02-2005 at 09:35 PM.
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Old 01-02-2005, 11:21 PM
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Thanks for the advice -- I'll give Audacity a look and see if they have a suitable codec for AAC.
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Old 01-19-2011, 07:18 AM
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A more elegant solution (without recoding) is mp4box (google it) - or, the more user-friendly GUI version called YAMB. It splits a 21h audiobook in about 5 minutes.
A similar tool (for converting or removing audio chapters) is mp4chaps.

Sorry for digging out an ancient thread, but it's still a #1 hit on google. And there is a lot of bad (for slow or costly software) advice on audiobooks out there.
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