I was searching the forum if there is an option to export the clean video overlay for merging with footage from an external camara in a NLE without importing large video files to my smartphone. It looks like there is no solution until now because android does not support any video encoder with alpha channel. It is actually not necessary to export color + alpha in one file. Most professional NLEs accept external alpha mattes which can easily be linked back to the color footage. You get this feature even for free in the non-studio version of Davinci Resolve. All we need is the overlay with a black background in one file and the alpha channel as a greyscale video in another one (black for transparent, white for fully opaque). It would be nice to have an option to adjust the resolution of the export to match different external video resolutions and aspect ratios. I would be really happy to see this feature in RaceChrono.