A manifest snapshot module now saves and restores DASH/ISM parser state for --remote and export/import, so an import keeps the service's period filter without fetching the manifest.
DASH no longer drops service-set DRM when the manifest has none, and the WebVTT rebase allows a cue that starts one segment early. --remote also sends single-track manifests matched by track id.
A service can build an AdaptationSet the served manifest does not contain, so the client's re-parse could never find it and the track downloaded with no manifest data. Those tracks now get a one-AdaptationSet MPD of their own.
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