Speaking as someone with migraine triggers, I'm pretty good with explosions and/or muzzle flash. But if it's the case of a con, where your vid might be the tenth I've seen with one or both? It very well could get to the point where I would want to opt out of some of the vids so that I didn't get overloaded from noise.

So for me the warning would be usual as a cumulative effect though possibly unnecessary.