Slowing down video to cater for PAL 4% speedup

[lchiu7]

Just recorded a TV show which is a musical. In PAL country so the broadcast was (DVB-T) 1080i/50 and clearly it had been sped up to take into PAL transmissions of a 24fps film.

The speedup makes the music pitched up a semitone which is a bit annoying.

I can convert the h.264/ac3 video to divx/ac3 using Handbrake. But I would also like to pitch the video down 4%. Is there an easy way to do this in VDub or because it has a AC3 audio track, perhaps VDubMod? I can see framerate conversion as an option for video but nothing like that exists for audio (guess I might have to demux the audio, and change the pitch using Besweet and then mux it back). I am bit confused by the framerate change options.

Under Video/Framerate there a bunch of options including Source Rate Adjustment (do I make it 23.976 or 29.97?). Then under Inverse Telecine do I need to select an option?

Any pointers really appreciated

Thanks

[CWR03]

All you need is to slow down the audio with an application that can handle AC3, or convert it to a format that can be more easily mainpulated, then reduce the speed by the correct amount (make it 104.27% of its original length). Once you replace the old audio with the new time-stretched one in VirtualDubMod, set the frame rate so "Video and audio durations match," no re-encoding necessary. Set to direct stream copy and save with a new filename.

[lchiu7]

Sounds like a reasonable plan. I demuxed the audio as a AC3 WAV file and tried to use besweet to slow it down -soundtouch (-rate 4) Runs okay but the pitch doesn't change at all. Is there another tool I could try out?