--- title: MPTS streams url: https://doc2.pstreamer.tv/en/manual/streamer/mpts.html lang: en product: Perfect Streamer version: 2.0.2.362 --- # MPTS streams MPTS (Multi Program Transport Stream) is an MPEG-TS stream carrying several programs (services); every program has a unique number (PNR). Its main applications are DVB broadcasting and the pass-through of ready-made multiplexes. The stream type — SPTS or MPTS — is selected at creation time and cannot be changed later ([New stream](../webui/streams.md#webui-stream-new)). ![MPTS stream pipeline: multiplex sources, input switch, analyzer, pass-through outputs and the bridge into SPTS streams through the demultiplexer.](../../_images/pipeline_mpts.svg) *MPTS stream pipeline: pass-through of the multiplex without any change to its composition; individual programs are processed through the demultiplexer in SPTS streams.* ## Multiplex pass-through An MPTS stream is a pass-through stream: the multiplex is transmitted as is. MPEG-TS filtering and modification ([MPEG-TS filtering](spts.md#streamer-spts-filter), [Stream modification](spts.md#streamer-spts-modify)), the bitrate modes ([Bitrate control](spts.md#streamer-spts-bitrate)), OTT delivery and DVR recording ([OTT and DVR](ott_dvr.md#streamer-ott-dvr)) do not apply to an MPTS stream. The constant bitrate and the composition of an own multiplex are set when it is assembled by the multiplexer ([Multiplexer](mux.md#streamer-mux)); an individual program is processed after it has been extracted into an SPTS stream ([Demultiplexer](demux.md#streamer-demux)). The sources of an MPTS stream are the network transports that receive a ready-made multiplex (UDP / RTP, SRT, PS1, RIST, Pro-MPEG, TCP, file and others — see [Planning and data transmission protocols](../planning/index.md#planning)), the DVB receiver ([DVB receiver](dvb.md#streamer-dvb)) and the multiplexer ([Multiplexer](mux.md#streamer-mux)). Single-program sources — HLS, RTSP, RTMP, the demultiplexer, the transcoder, the test generator — are not available for MPTS. The outputs are transport outputs, including delivery of the multiplex into a DVB distribution network; an MPTS stream has no OTT outputs. Source redundancy works in the same way as for SPTS streams: several inputs ordered by priority, the stream timeout, the check interval and the return to the primary input ([Source redundancy](spts.md#streamer-spts-reservation)). ## Per-program analysis The analyzer of an MPTS stream keeps its accounting per program separately and in summary for the whole multiplex: bitrate, state and continuity errors, scrambling, media information for every program, and the identifiers of the multiplex (TS ID and network identifier). The summary program counters — total, clean, scrambled and with faults — are shown in the stream statistics window ([Stream statistics](../webui/streams.md#webui-stream-stats)); in the stream list, MPTS streams are marked with the MPTS badge and placed in a separate group. A scrambled program is considered valid and is not added to the error counter. For MPTS, the TR 101 290 monitor (the “Analyze” tab, the “TR 101 290 monitor” setting) issues a single verdict for the whole multiplex: transport errors, continuity across all PIDs, PCR repetition and PCR discontinuities across all programs, the presence of the PAT/PMT and SI tables (NIT, SDT, EIT, TDT). The window of the permissible PCR jump is set by the “PCR discontinuity window (ms)” input setting — as for SPTS streams ([Synchronization](spts.md#streamer-spts-sync)). The in-depth SPTS metrics — PCR accuracy, T-STD video buffer analysis, PTS intervals — do not apply to the multiplex as a whole: for a detailed analysis of a program, extract it into a separate SPTS stream ([Demultiplexer](demux.md#streamer-demux), [Analyzer](analyzer.md#streamer-analyzer)). For an MPTS stream the mosaic is disabled by default (the “Generate mosaic” setting); when it is enabled, a thumbnail is produced for every program of the multiplex. This is a noticeable additional load — enabling the mosaic of a multiplex on loaded servers is not recommended. ## BISS descrambling The network and file inputs of an MPTS stream (UDP / RTP, SRT, RIST, Pro-MPEG, TCP, PS1, file and similar) support software BISS descrambling per program: “program number — key” pairs are specified (BISS-1 or BISS-E), and every listed program is decrypted before analysis and further transmission. Descrambling at DVB adapter level — CAM and BISS, including the keys for T2-MI — is described in [DVB receiver](dvb.md#streamer-dvb). ## Multiplex EPG The programme guide carried in the multiplex is extracted into the node’s EPG database by the “Extract EIT to EPG database” setting ([EPG/XMLTV import](epg/xmltv.md#streamer-epg-xmltv)). EIT generation is not performed on a pass-through MPTS stream: the EIT tables of the programs are carried over by the multiplexer from the source streams during assembly ([Multiplexer](mux.md#streamer-mux), [EIT generator](epg/eit.md#streamer-epg-eit)).