Pins github.com/streamplace/muxl/go to streamplace/muxl#7 (dbacdfe). muxl readers now carry canonical segments of track groups they don't decode (e.g. upcoming transcript/text tracks) through unwrap, events, metafiles and flat wraps instead of failing with "segment catalog describes no track"; only moov synthesis and the appendable fMP4 leave them out. Event bytes still reassemble to the stored blob, so the VOD metafile's byte-range offsets stay correct.