[krak]

I rather think there are more important changes that the author would want to make first .

Just out of curiosity, why would you want to do this?

As a musician, I have no need for video for set lists in gigs (just as I don't need the sound), but as a teacher the video is extremely useful for the students and and myself (playing technique - what to do with a lead sheet in non-classical music etc).

I also use MobileSheets for dance descriptions, there the sound is essential and video would be brilliant

I'm not a programmer, but I imagined, since MobileSheets already accepts mp4-video (but only stores the sound), that it wouldn't be difficult to call an external video-player and eventually a small video-window (as it is possible with embedded video in Adobes pdf-viewer).