24bcff5650
Right now the prog-map's meaning of `PMT_%d` is overloaded: - PMT_<PGM> is used to look up the PID for the PMT. - PMT_<PID> is used to look up ordering keys for streams in the PMT. This is not a problem in practice because program numbers and PES PIDs shouldn't overlap. Still, it's quite the wart in the API. Provide "PMT_ORDER_%d" as an unambiguous way of specifying ordering keys. See: https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/1510#note_2790022 Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/8584>