WOH composite could be use to compose two tracks on a single canvas (track) which enables Opencast to produce picture-in-picture and picture-by-picture videos. It also support watermarking of the resulting video.
So far, WOH composite is limited to deal with the composition of two tracks.
The goal of this story is to allow WOH composite to layout single track recordings. This way, watermarking can be used consistently for single track recordings, too.