Hiho!
Finally the tutorial 4 "Positioning, Sizing & Sub-Mixers" is released! The positioning & sizing of video elements in GiraFX is a key feature that finally unify all aspects of video compositing in Reaper. Instead of relying on a single video canvas, the library lets you work with up to 9 additional canvases for grouping elements, in effect enabling video sub-project within the main project. After connecting to the right canvas, all sizing & positioning are made in relative coordinates to be actualized to real coordinates and sizes in the video mixers at the rendering stage. Provided suffisant resolution of sources, you may work the project in 1280x720 and switch it to 4k without touching a single video item!