I've always been curious about letterboxing the aspect ratio. What's the best way to do it?
I've heard that you should work in a timeline that has the desired aspect ratio set in the sequence settings.
Although I imagine that this restricts you from changing the aspect ratio at different parts of your film if you desire to do so (i.e. cutting to IMAX footage).
Is overlaying a letterbox really a good way to do it? I've heard that overlaying a letterbox affects your video if you want to play it on a screen with a native 2.40 aspect ratio, where it's not sized and formatted correctly. Also there's a chance of artifacts showing up on the black bars.
Anyone have thoughts on this?