combining .mp3 files

[stoneage]

Is there a good app to combine two .mp3 files to make one soundtrack for an iPhoto slideshow? I don't think you can use more than one file for a slideshow created in iPhoto. I don't want the song to repeat and I want the slides to appear for more than 1 second.

[mrstinson]

I have used a program called HJSplit for Java (http://www.freebyte.com/hjsplit/). Check it out, this will work on OS X or any platform running Java. You can split or join multiple files. I have never joined two MP3's but I do not see why it would not work.

[slacker]

There is a great open source program called Audacity. Check out http://audacity.sourceforge.net

[GlowingApple]

I'll second on audacity. It's a great little app that does a lot of nice sound editing. Unfortunately it still does not support AAC and needs a separate library (LAME) installed to support MP3, but instructions are on their site.

[acme.mail.order]

If you simply want to join two (or more) mp3's end to end, AND the settings are the same in each, you can simply cat them together in the terminal ( `cat file2.mp3 >> file1.mp3 #note that this command will change file1.mp3`). If the metatags are important it will mess things up a little as you only see the tags for the first file.

[voldenuit]

For the tags, it's even more confusing when you use acmes method:

You'll have tags from the first and the last mp3 if they have v1 and v2 tags, so you should definitely either strip or fix them.

I'd strip tags and cover-art before to be on the safe side.