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I have joined a couple of audio books, which were originally splitted in several parts, and were recorded from different radio stations. Earlier I made an mp3 joiner script, which uses ffmpeg and applies 3.5 seconds silence tracks between the joined parts. I used two kind of silence tracks in the past: "mono, 96kbps, 32000 Hz" and "joint stereo, 128kbps, 44100 Hz", both exactly 3.5 secs. generated by Audacity. Unfortunately I forget to change the silence track file path in the script, so I joined 44100 Hz joint stereo audio book tracks with mono-32000 Hz silence tracks inbetween, which are fairly incompatible: when I open the big joined mp3 files in MP3 DirectCut software, it says, this is a so called "Frankenstein track", which incompatibly mixes different channel layout and sampling frequencies. Audio plays as a slow recording. When I open the file in VLC, it plays properly. Main problem is, that these "mixed layout" mp3 files won't play in HTML5 web audio players, it simply refuses it, and I would like to use them on a webpage.

Of course I deleted the original separated tracks, so I have only one option: somehow fix the joined "mixed layout" files. Full recoding is also an option, however it would be very slow on my machine, would take several hours, at least 10-12 hours, I think, on my P4 2.4 gHz computer, for the dozen audio books. So I would prefer some kind of fixing instead, or maybe re-splitting, according to the "mixed layout" track boundaries.