Well up to the editor, ultimately.

: You are talking about the in-game soundtrack aren't you? I'm actually not
: sure if iMovie will let me fade out the soundtrack separately like that.
: But otherwise it sounds like a potentially useful tip.

Yep. I use Vegas Movie Studio on PC.

: But don't you think it's more elegant to take the approach I recommended, of
: using intelligent cutting? Showing a long journey speeded up is not just
: hard on the eyes (I'd probably just look away or try and jump the movie
: ahead), it's also kind of crude wouldn't you say?

A lot of the time I'll cut, but if I'm showing a full-level playthrough sometimes I'll speed something up to show that it is one continuous playthrough.

: I'm not sure exactly what you mean by that last bit. When you say
: "literally", I'm not sure if you're talking about voice work

Yes, voice-over work. I mean literally, literally.

: In regard to people disabling captions such as provided by YouTube
: annotation, I don't think the video maker should feel obliged to take any
: account of that.

You have to be aware how people actually act. You can't just produce videos in a vacuum.

: Huh? Can you give me an example of a typical inconsistency you have to guard
: against?

I don't do it so much anymore, but in >this video I slipped into a pseudo American/mid-Atlantic accent. I was embarassing.

: That's certainly an idea worth mentioning, but on the negative side it's a
: bit like delivering the punchline of a joke in advance. I personally
: wouldn't worry about potentially losing some casual viewers who don't care
: to watch build-up material,

Everyone hardcore was once a casual...

: Yeah, I really don't like being asked to click 'like'. I seem to recall a
: period when I got so irritated with that, I adopted the policy of
: automatically clicking 'dislike' instead. Mean huh?

Hahahahah! I used to do that too. Not so much now.