Support VP9 in Dynamic Packaging
For 4k and high quality video streaming, compression-efficient codecs like VP9 and HEVC are required. H264 and other old codecs can be used, but they require huge amount of streaming data for 4k streaming.
Currently, H264 and HEVC are the only supported video codecs by Dynamic Packaging. ( https://docs.microsoft.com/en-us/azure/media-services/latest/dynamic-packaging-overview#video-codecs-supported-by-dynamic-packaging )
However, lots of devices, including Chrome and new Chromium Edge, are not supporting HEVC due to license and other problems. So it is hard to offer 4k streaming for large portion of devices through Dynamic Packaging.
VP9 is supported by non-Apple devices because it is royalty-free. If Dynamic Packaging supports VP9, most of devices will be capable of efficient 4k streaming through Dynamic Packaging.