merge-split-av-streams-desktop

Playing a separate audio-only stream and video-only stream as ONE source on JVM desktop through the media engine's edit-list URL form — the desktop counterpart of a merging media source — including length-prefixed quoting of stream URLs and why a merged two-URL item must not be prepared in the middle of a crossfade. Reach for it when desktop video plays back completely silent with nothing in the log, when a stream…