Buttons over 16:9 Video Tracks
To place a button over a video track, you add a menu overlay to a subtitle stream in the
track. These overlays are not processed in the same way as the video, so you must create
a separate overlay for each display mode (16:9, 4:3 letterbox, and 4:3 pan-scan). You then
need to create a script that selects the correct subtitle stream to display based on the
DVD player’s settings.
What Happens with Different Aspect Ratios?
for information on using subtitle streams
to place buttons over a video track, and see
for information on creating
Preparing Video Assets