Demultiplexer

A demuxer input (the demuxer type) extracts a single programme from a multiplex and turns it into a regular SPTS stream. Once extracted, the programme is subject to all the processing of the SPTS pipeline (SPTS streams): filtering and modification, transcoding, OTT delivery and DVR recording. Only this way can a received multiplex be processed programme by programme (MPTS streams).

To connect a programme, an input of the demuxer type is added to an SPTS stream and the following are selected (the field names are as in the interface):

  • Source (the Source kind and Source id fields) — an MPTS stream of the same node or a DVB adapter (DVB receiver).

  • Programme (the PNR field) — picked from the list of the services detected, with their names. The list is supplied both by an MPTS stream and by a DVB adapter, as long as the source is running and has been analysed. While there is no list (the source has not been chosen yet, the adapter is stopped, the stream has not been analysed), the number is typed in by hand.

Specifics:

  • The demultiplexer receives an already descrambled multiplex: the BISS keys are set on the input of the MPTS stream (BISS descrambling), while CAM and BISS descrambling at the adapter level is set in the DVB adapter settings (DVB receiver).

  • The source is protected against deletion: as long as at least one demultiplexer references an MPTS stream or a DVB adapter, it cannot be deleted, and the node reports which objects reference it.

  • For inner T2-MI multiplexes a composite programme number is used that combines the carrier number and the PNR within that carrier: carrier number × 65536 + PNR (for example, carrier 1, PNR 7 → 65543; carrier 0 is the outer multiplex, an ordinary PNR). There is no need to work it out by hand: the inner programmes appear in the same list, below the outer ones, already under their composite numbers. T2-MI reception is described in DVB receiver.

The same multiplex can be delivered at the same time in full (an MPTS stream with transport outputs) and in parts, as individual SPTS streams through demultiplexers.