WarpOS version of this and SOX port, sometimes works with no problems, sometime doesn't.
In the case where mp3gain fails, it prints the name of the mp3 as it should, but then it doesn't do anything else. It is not possible to break the process. Stack was raised at 400kb.
When this happens sometimes it brings down the whole WarpOS, sometime it doesn't.
This whole behavior reminds me exactly the one of UnRar_WOS, which is known to be buggy. I know that i'm not being very helpful to track down the problem. Sorry about this.
NOTE: We are against spam (like everybody should..), and therefore we protect our user's email(s), if you need to contact someone who posted a comment here, you must replace NoSPAM by @, and remove everything beyong the last @.