You have to be the judge of what looks good at what fps. If I make my own then I try to render it out at 15fps to keep the file size down. If playing with video then 24 or 30fps would look better but again you don't want to have a massive file for a boot animation. You have to be the judge of the timing for play through. You can have one or two folders in your boot animation and the text document will change depending on what you want. As an example, in this text document I would have two folders, part0 and part1, and it would read as follows, "480 800 15p 1 0 part0p 0 0 part1". This is stating the size, then frames per second, then part, play through first folder once with no pause, and then play the frames in the second folder set infinitely, (first "0" in 0 0 part1), until the phone boots. A "1" would be play through once. The second "0" tells it that there is no pause whereas for example if I changed it to "0 10 part1" I am telling it to pause the time it takes to play 10 frames before starting to play the next set. I hope that is not too confusing.