Are there transmission schemes that can transfer multiple independent streams that add up for better quality? It could be streams containing information about

Are there transmission schemes that can transfer multiple independent streams that add up for better quality? It could be streams containing information about smaller subblocs, etc. If you take a fourrier transform, the more coefficients you include, the more faithful the reproduction is. Splitting the quality level into multiple independent streams could have multiple advantages : - better use of Multicast, as viewers for different quality settings get the same data, so you use approximately the bandwidth for one full quality video instead of full quality + medium + low... - save on storage space for the same reason - save on transcoding time, as only one pass is needed - better suited for distributed storage/transmission, on a platform like PeerTube, where every p2p client could contribute back instead of clustering by quality. I am not working in this field, but I know a fair bit about compression, and this seems a no-brainer to me. Is it already done? Where? Or did I oversaw some issues?