Be aware that there is also a HLSPLaylist.m3u8, which also hosts a set of video files. For some videos, the youtube-dl "best" option which is default, will select on of these, which leads to some of the test cases I have seen where the original video was not the same size as the largest video hosted on DASHPlaylist.mpd. HLS will be ignored for now, will aim to get this feature fully working with DASH first.
Originally posted by @kepler471 in #7 (comment)