Ancient Aliens demo doesn't record music

Hi. I was trying to record the first Ancient Aliens map demo, but when I finished it and uploaded it to YouTube the music just don't sounds. It just plays the background sound, but when I "Smoke" the pipe and passes the wolf psychodelic section the sound just stops and the music doesn't play. I'm recording it with the viddump PrBoom+ utility, so I don't know if is something 'bout compatibility, my pc or it's just that it cannot be fixed. I tried also to drag the mp4 video to Vegas Pro but the audio just glitches and it just keep a white noise, so I can't fix that by editing.

Here is the video

You have to use Fluidsynth as the MIDI player (bottom of the first page of general options) if you want the music to play in the -viddump output, as that's the only player whose output PrBoom+ (and dsda-doom) can redirect to the video file instead of your speakers. (The music/ambiance that plays before you use the pipe works either way because it isn't a MIDI.)