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Cutting an MP3 gaplessly without re-encoding., I need advice, please.
S3NT13NT_GL1TCH
post Feb 24 2013, 00:07
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Greetings all!

This is my first forum post here, although I have been a reader for a while now. I ran into a dilemma recently. I purchased an album off of BandCamp that included a bonus track, but the problem is that they made the last track and the bonus track one file rather than splitting the bonus track into it's own separate file. I'm a perfectionist, so naturally I went about trying to find a program that could cut the mp3 into two separate tracks without compromising quality. This was harder than I imagined.

Most programs that claim to split audio files without re-encoding don't actually do it flawlessly. The data isn't encoded in a truly gapless way, and this bothers the hell out of me. I've referred to several old threads here on the board (Which I will link to in a second) and they all seem to recommend a problem called "pcutmp3" which has been dead since 2009:

http://www.hydrogenaudio.org/forums/index....showtopic=62757
http://www.hydrogenaudio.org/forums/index....showtopic=73064

I've tried to run the most recent release (0.98 Beta), but to no avail. I just get an error message that states that "a java exception has occurred". I'm running a PC with Windows 7 Home Premium, 64-bit installed. And as explained in the previous threads, programs like Medieval CUE Splitter and mp3Directcut just don't do the job.

So my question is... Are there any other programs today that are able to do what I need, i.e., splitting an mp3 file into two separate files WITHOUT re-encoding them, AS WELL AS making the resulting files play back gaplessly? Surely in the three years since those threds were posted at least one other program has been developed that can do what pcutmp3 used to do, right?

Any suggestions would be tremendously appreciated.
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mixminus1
post Feb 24 2013, 00:19
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1) Try an earlier version of pcutmp3. It's been awhile since I've used it, but I also ran into Java errors, and IIRC, one of the earlier versions worked while 0.98 didn't.

2) Be aware that the way pcutmp3 cuts MP3's "gaplessly" is by writing new encoder delay and padding values into the LAME/Xing tag. Those values can often be unusually large, and some players may not be able to cope with them, and that's assuming you're using a player that actually reads those values and implements them in the first place.


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S3NT13NT_GL1TCH
post Feb 24 2013, 00:47
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I've tried using the previous version of pcutmp3 and it doesn't work either, unfortunately. I'm a real stickler for preserving audio quality, even when in mp3 form, and I want to be sure that whatever program I use will not degrade the quality of the resulting tracks in any way. If at all possible, I want them to be perfect binary equivalents of the original joined file. Surely, something out there can do this, right?

This post has been edited by db1989: Feb 24 2013, 00:51
Reason for edit: Please don’t quote pointlessly and/or after your reply.
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greynol
post Feb 24 2013, 02:52
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QUOTE (S3NT13NT_GL1TCH @ Feb 23 2013, 15:47) *
I'm a real stickler for preserving audio quality, even when in mp3 form, and I want to be sure that whatever program I use will not degrade the quality of the resulting tracks in any way. If at all possible, I want them to be perfect binary equivalents of the original joined file.

It's been a very long time since I played with cutting and reattaching mp3 tracks losslessly and remember there being a lot of different methods over the years. So long as the solution doesn't involve decoding and then re-encoding (none of the solutions offered do this, so not to worry) then there will be no degradation in quality. Non-gapless cutting merely adds a very tiny fraction of a second of silence and fail to provide your media player information about how to connect the tracks seamlessly upon playback (assuming it would otherwise be able to do so). If the cut is performed over a transition that is already silent then this is a non-issue.


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Posts in this topic
- S3NT13NT_GL1TCH   Cutting an MP3 gaplessly without re-encoding.   Feb 24 2013, 00:07
- - db1989   mp3splt mp3DirectCut Oops, you mentioned the latt...   Feb 24 2013, 00:17
- - mixminus1   1) Try an earlier version of pcutmp3. It's be...   Feb 24 2013, 00:19
|- - S3NT13NT_GL1TCH   I've tried using the previous version of pcutm...   Feb 24 2013, 00:47
|- - greynol   QUOTE (S3NT13NT_GL1TCH @ Feb 23 2013, 15...   Feb 24 2013, 02:52
- - Cynic   Bandcamp require lossless uploads from the artists...   Feb 24 2013, 02:17
- - mjb2006   pcutmp3 0.97.1 is working OK for me in Win7 64-bit...   Feb 24 2013, 02:55
- - S3NT13NT_GL1TCH   @Cynic: That's true. In fact, that was what I ...   Feb 24 2013, 03:03
|- - Porcus   QUOTE (S3NT13NT_GL1TCH @ Feb 24 2013, 03...   Feb 24 2013, 03:27
- - greynol   I have no idea which encoder and what settings ban...   Feb 24 2013, 03:36
- - S3NT13NT_GL1TCH   @Porcus: Yes, indeed. That's always my preferr...   Feb 24 2013, 18:39
- - greynol   Yes, that is what I'm suggesting. I would als...   Feb 24 2013, 18:48
- - S3NT13NT_GL1TCH   @Greynol: Fair enough. Perhaps you could link to o...   Feb 25 2013, 03:36
- - greynol   Here's an example that might get the ball roll...   Feb 25 2013, 04:30
- - testyou   mp3splt has a gui.   Feb 25 2013, 19:26
- - db1989   The OP omitted to respond to my previous post cont...   Feb 25 2013, 23:58
- - 2Bdecided   I don't think they're gapless in the way t...   Feb 26 2013, 11:03
|- - S3NT13NT_GL1TCH   That was exactly what I was getting at. Maybe I wo...   Feb 27 2013, 00:00
- - db1989   mp3splt does the same thing for Vorbis, too. I don...   Feb 26 2013, 14:41
- - greynol   Wait, mp3split is gapless (and glitchless)? To th...   Feb 26 2013, 16:01
- - 2Bdecided   Gapless/glitchless mp3 decoding has patchy player ...   Feb 26 2013, 17:33
- - mjb2006   All the MP3 splitters cut on frame boundaries. pcu...   Feb 27 2013, 00:00
- - greynol   If the cut was performed over a period of silence ...   Feb 27 2013, 01:11
- - crazyman   How about mptrim? You can first delete part 1 and ...   Mar 8 2013, 20:48
|- - mjb2006   QUOTE (crazyman @ Mar 8 2013, 12:48) How ...   Mar 8 2013, 22:58
- - markanini   Perhaps subtrack/chaspter indexing via tags would ...   Mar 9 2013, 22:28


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