I did find this function in AUM 36. It captures a bunch of stills and then you manually reassemble them using video editing software. Does anybody know a method to create a video from a game that doesn't require manual assembly?

var shot_number = 1;
starter create_movie()
{
while (key_c == 0) {wait (1);}
while (1)
{
screenshot ("shot_", shot_number);
shot_number += 1;
wait (1);
}
}