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How to edit mp3 file without exporting/re-encoding?
Posted: Sun Jan 24, 2021 10:27 pm
by AudacityUser#3345176
I have taken a look at the documentation for the last 15-20 mins now and have not been able to locate an answer to this question, so here I am:
I have an mp3 file that I simply need to edit for time, chopping off quite a bit of the beginning and end of the file. I do not wish to re-encode the file in any way, so as to preserve the original sound quality, which exporting to either WAV or re-encoding the file to mp3 (again) will not allow for. I simply want to cut off the bits I want to cut off and leave the resulting file unchanged in terms of format, quality, etc., which seems impossible via the export process.
Is this possible with Audacity?
Re: How to edit mp3 file without exporting/re-encoding?
Posted: Sun Jan 24, 2021 11:28 pm
by DVDdoug
Audacity (and all "regular" audio editors) decompress the file when you open it. The original file isn't touched but if you re-export as MP3 you are going through another generation of lossy compression.
mp3DirectCut can do some basic editing without decompressing the file.
which exporting to either WAV
Exporting to WAV preserves the "original" MP3 quality. The "damage" is done during compression when information is thrown-away to make the smaller file. And when you play it back it gets decompressed anyway so it's not much different than decompressing and converting to WAV ahead of time.
Re: How to edit mp3 file without exporting/re-encoding?
Posted: Sun Jan 24, 2021 11:34 pm
by kozikowski
Is this possible with Audacity?
No. You are looking for one of the "Pure MP3 Editors." They have very limited cutting and editing and don't have to rip the MP3 part and put it back together again with the increase in compression damage.
Koz
Re: How to edit mp3 file without exporting/re-encoding?
Posted: Sun Jan 24, 2021 11:36 pm
by kozikowski
mp3DirectCut can do some basic editing without decompressing the file.

- Screen Shot 2021-01-24 at 15.34.42.png (20.17 KiB) Viewed 136 times
Koz
Re: How to edit mp3 file without exporting/re-encoding?
Posted: Sun Jan 24, 2021 11:56 pm
by steve
mp3DirectCut website:
https://mpesch3.de/
(it's working for me)
Re: How to edit mp3 file without exporting/re-encoding?
Posted: Mon Jan 25, 2021 12:44 am
by kozikowski
It's back.
Let's take the internet connections down on Sunday.
Koz
Re: How to edit mp3 file without exporting/re-encoding?
Posted: Mon Jan 25, 2021 1:39 am
by AudacityUser#3345176
Thanks for the info, everyone!