I'm trying to submit my game to Viveport, but the docs say I have to provide a webM video. I've looked all over and I can't seem to find anything anywhere that will let me do this. The web hosted converters won't work because my file size is too large and there doesn't seem to be anything else.
Anyone had any experience doing this? I would have assumed that with such an isoteric format, Vive would provide a converter like Steam does, but I guess not.