I would assume Reddit would not want any DRM. I can't speak to what they would use for a CDN. Decoding support in HTML5 is pretty good (except for HEVC). The

I would assume Reddit would not want any DRM. I can't speak to what they would use for a CDN. Decoding support in HTML5 is pretty good (except for HEVC). The only things that Reddit would need to care about are file size and audio. It seems likely that Reddit would reject audio, or categorize videos that have it, so it could give fair warning.