I know it's been quite awhile since this thread was started, but I'd like to also express my interest for this feature.     I read an interesting intro to using mpeg-dash with several mp4 files, each with its own bitrate.  Streaming auto switches between them seamlessly based on bandwidth conditions.     https://blog.streamroot.io/encode-multi-bitrate-videos-mpeg-dash-mse-based-media-players/   What's the feasibility of adaptive bitrate streaming at this point?