Multi Track question

I have a 2 hours recording in mp3 file and need to segment it into several tracks so that when I insert the finalized CD into a CD Player I can just go from one track to the other.
I wish to accheave the goal that if someone listen to the entire 2 hours conversation does not notice the interruption from one track to the other but on the other hand need to tell Audacity where each track starts and ends.
So far I use tracks - Add new lable to the selection (Ctrl + B). I do not know how to manage the brackets to be sure they are in sync meaning when one finishes the next one starts. Is there a way to make it do to Audacity? How to do so?

Lastly, when I export all tracks i noticed that Audacity adds automatically few seconds of silent? Is it possible to avoid this? This would not be usefull in order to let the user listen to the entire 2 hours recording.

thank you,

I have a 2 hours recording in mp3 file and need to segment it into several tracks so that when I insert the finalized CD into a CD Player I can just go from one track to the other.

Regular CD players can’t play MP3s. (All computers can play it, most DVD players, and some car stereos can). A standard audio CD can’t be longer than 80 minutes.

So, that’s the first question… Do you want an audio CD or a “data CD” with MP3 files on it?

The next question is, are your original files MP3? (MP3 is lossy compression and if you want MP3, ideally you’d compress to MP3 once as the final step after all editing.)

You can make a “gapless” audio CD from one long WAV file (or MP3) with up to 99 tracks.

Lastly, when I export all tracks i noticed that Audacity adds automatically few seconds of silent?

MP3 adds a few milliseconds of silence. That’s just a characteristic of MP3. There are gapless MP3 solutions, but I believe the player has to support it. You shouldn’t be getting several seconds of silence. If you can use AAC instead of MP3, I think AAC is normally gapless.

Some CD burning software adds a 2-second gap when you make an audio CD.


I have the source files in MP3 format.
I will save the edited files in MP3 format. Then, I will use Roxio Creator to create a standard audio CD. This software does not add silence if I set it this way.
I wish not to have any millisecond of silence added up front. Should I use a plug-in or so? I need to mak sure there is zero added silence as when one track will be plaied next to the other ones the end user should not noticed this difference of moving from one track to the other.

So, is Gapless what I need? I did not understand which tool to use in Audacity.

Thank you

A fine distinction, but an important one is that Audacity only “saves” as “Audacity Projects”. To create a “normal” audio file (such as WAV or MP3) you need to “Export” the project rather than “Save” the project.

Exporting from Audacity as MP3 will (needlessly) reduce the sound quality because the MP3 format is “lossy” - that is, encoding as MP3 always discards some of the audio information, resulting in lower sound quality than the original. For best sound quality, export as “16 bit WAV” (the default for Audacity). Exporting as WAV also avoids the problem of MP3 adding a few milliseconds of silence.

Hi and thank you for your reply and clarifications.

I only need one answer to be able to start working on this project:

  1. is Track Lable the tool I have to use for my need?
  2. how do I make sure that the beginning of track 01 will be just immediately after the end of track 01 and so on?

Thank you

Oh, I see that no one has given you the Tutorial link yet.
Here it is, this should be helpful:

I have a similar question.
I extracted from Adobe Premiere Pro the audio of a video and elaborated in Audacity. Now, I have to reverse it back into Adobe Premiere Pro.
I believe I should save it as 16 bit WAV (Windows). Is this correct?
How about bit rates? If I right click on the exported wav file I read 1411 kbps. Is this correct?
I ask as I know that for CD Audio I cannot go higher than 320 kbps.
I also know for DVD and blu-ray there is an audio standard being 44000 or 48000 Hz

Can someone please elaborate a bit so that I can understand and learn how to go from Origina Video Recording (from a Sony handicam) to Adobe Premiere Pro to Audacity to Adobe Premiere Pro?

I also remember that from Adobe Premiere Pro I extracted the audio in MP3 format with 256 kbps.

Thank you

I believe AAC employs padding.

M4A files produced by current iTunes seem to put the padding entirely at the end of the file, but the AAC encoder used in the FFmpeg version currently “recommended” for Audacity pads the start and end.


for the initial thread question I solved the problem.
I wish to receive help with my latest post, if possible.
I decided to add the question to this existing thread because it has to do with exporting track topic.

Please advise if possible.

Thank you

We can’t offer support for Adobe Products. What format is the video in? You can’t add all audio types to all video types.

It’s correct if you exported a stereo 16-bit WAV from Audacity at 44100 Hz.

Audio saved on a CD authored as an Audio CD or Music CD can only be 1411 kbps (16-bit PCM, stereo, 44100 Hz). See Compact Disc Digital Audio - Wikipedia.

If you simply demuxed the audio from the video without changing its format, then you can try exporting from Audacity as 256 kbps MP3. Choose “MP3 Files” when you export then click “Options…” to check that the MP3 export bit rate is 256 kbps.

If you converted the audio from the video to MP3 that is a mistake, because you lost quality.

A method of extracting the audio from the video into Audacity without making the audio quality worse is to install FFmpeg ( Audacity Manual ) then drag the original video file into Audacity.