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I want to split an M4A audiobook into its chapters without re-encoding, [was “Split Audiobook (.m4a) with Re-encording”]
dave656
post May 28 2012, 20:05
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I have a large audio book file @64kbps which I want to split into chapters without degrading its quality. I'm looking for such a tool that can make direct cuts with touching the bitrate. For an alternative, I'm also thinking about splitting the file .mp3 but I'm not sure If that would be right thing to do for something @64kbps.
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dave656
post May 30 2012, 04:46
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I'm also looking for a player that is able to show chapters information of .m4a file. Generally, I use Media Player Classic and Winamp for any type of media file but I'm not sure if it would be possible to have this capability in any one of them.
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bug80
post May 30 2012, 09:13
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I would use ffmpeg for this task. Easy if you are on Linux, but there are also Windows builds available: http://ffmpeg.arrozcru.org/builds/

Then from the command line/prompt you could type for example:

ffmpeg -i input.mp3 -acodec copy -ss 60 -t 120 output.mp3

This copies 120 seconds of audio, starting after 60 seconds.

Good luck!
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Kohlrabi
post May 30 2012, 11:42
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To losslessly add chapters to your MP4 files, try MP4Box or the associated GUI YAMB. At least YAMB should accept chapter files in the OGM chapter format.

This post has been edited by Kohlrabi: May 30 2012, 11:44


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Brazil2
post May 30 2012, 15:44
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QUOTE (Kohlrabi @ May 30 2012, 12:42) *
To losslessly add chapters to your MP4 files, try MP4Box or the associated GUI YAMB.

Yes, but you want to use the latest beta of YAMB: http://yamb.unite-video.com/Yamb-2.1.0.0_beta2_setup.exe
With an up to date version of MP4Box: http://gpac.wp.mines-telecom.fr/downloads/...nightly-builds/

wink.gif
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frozenspeed
post May 30 2012, 16:13
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QUOTE (dave656 @ May 28 2012, 12:05) *
I have a large audio book file @64kbps which I want to split into chapters without degrading its quality. I'm looking for such a tool that can make direct cuts with touching the bitrate. For an alternative, I'm also thinking about splitting the file .mp3 but I'm not sure If that would be right thing to do for something @64kbps.



ffmpeg will do this.

I'm sorry, I don't know the exact command line but I can get you started:

ffmpeg -i INPUTFILE.m4a -acodec copy <SOMETHING GOES HERE> OUTPUTFILE.m4a

in the <SOMETHING GOES HERE> part you will need a flag to specify splitting the file at specific points. Google around and you'll find the missing piece. Hope that helps.
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dave656
post May 30 2012, 22:09
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QUOTE (Kohlrabi @ May 30 2012, 03:42) *
To losslessly add chapters to your MP4 files, try MP4Box or the associated GUI YAMB. At least YAMB should accept chapter files in the OGM chapter format.



I noticed there's a split option in GUI YAMB, will it be able to split without re-encoding? I have looked into the website but no such information is given.
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