SAT>IP URL Builder & T2-MI / MPS Decapsulation

SATLINE · Technical reference

Complete reference for SAT>IP URL construction — multistream ISI/PLS, and direct, server-side T2-MI and MPS decapsulation.

1.Overview

SAT>IP streams DVB content over IP using HTTP. The URL is how you tell the server which transponder to tune and how to process the signal — from a basic transponder to complex multistream and T2-MI configurations that simpler tools can’t handle.

Every URL carries tuning parameters (frequency, polarization, symbol rate, modulation, FEC) plus, when needed, advanced parameters:

• Multistream — isi, plsc, plsm select one stream on a shared DVB-S2/S2X carrier.
• T2-MI decapsulation — t2mi_pid, t2mi_plp, t2mi_pids unwrap a DVB-T2 multiplex carried over satellite.
• MPS decapsulation — mps_pid, inner_sid, inner_pids extract a nested inner transport stream.
• Descrambling — biss keys for BISS-scrambled contribution feeds.
• PID filtering & duration — request specific channels; bound a scan.

Properly constructed URLs work with any SAT>IP client — TVHeadend, VLC, Enigma2, Cesbo Astra — and, for T2-MI/MPS, the decapsulated stream plays directly with no post-processing.

2.Basic parameters

Mandatory tuning parameters for any satellite transponder.

http://SERVER:8875/?src=1&freq=11727&pol=v&sr=30000&msys=dvbs2&mtype=8psk&fec=34&pids=all

This tunes 11727 MHz Vertical, 30000 KSym/s, DVB-S2 / 8PSK / FEC 3⁄4, and streams the full transponder (pids=all).

3.FEC notation

FEC values use a compact two-digit notation — numerator then denominator.

Rule of thumb: higher ratios (8/9, 9/10) give more usable bandwidth but demand a stronger signal; lower ratios (1/2, 2/3) spend more on error correction and tolerate weaker signals.

4.Multistream — ISI

DVB-S2/S2X multistream carries several independent transport streams on one carrier. The isi parameter (Input Stream Identifier, 0–255) selects which one.

isi

Input Stream Identifier — selects the stream. Range 0–255. Alias: plp.

Real example — Eutelsat 5°W, 12.536 GHz H

One frequency, multiple regional Italian streams selected by ISI:

http://SERVER:8875/?src=1&freq=12536&pol=h&sr=35300&msys=dvbs2&mtype=8psk&fec=23&isi=9&pids=all

5.PLS code & mode

Some multistream carriers are separated by a Physical Layer Scrambling (PLS) code rather than — or together with — ISI.

plsc

PLS code. Range 0–262143.

plsm

PLS mode: gold (default, most common), root, or combo. Alias: pls_mode.

http://SERVER:8875/?src=1&freq=12606&pol=v&sr=35300&msys=dvbs2&mtype=8psk&fec=23&plsm=gold&plsc=131070&isi=5&pids=all

6.T2-MI decapsulation

T2-MI (T2 Modulator Interface) encapsulates a full DVB-T2 multiplex inside a DVB-S2 carrier — the satellite-to-terrestrial gateway used to distribute DTT muxes to regional transmitters. SAT>IP Server Pro decapsulates it and returns the inner DVB-T2 transport stream directly.

t2mi_pid

Outer PID carrying the T2-MI packets. Use auto (tries 4096, then 4095) or an explicit PID (typically 4096).

t2mi_plp

DVB-T2 Physical Layer Pipe to extract. Default 0 when t2mi_pid is set; use auto to pick the first PLP that carries data, or all to merge every PLP (e.g. a common PSI PLP + data PLPs). Most feeds only carry PLP 0.

t2mi_pids

PID selection on the extracted inner TS. Default all; or a CSV list for an SPTS-style output.

bbframe

bbframe=1 enables raw DVB-S2 BBFrame input mode for STiD135-based tuners on multistream (MIS) carriers whose bursty T2-MI the demod drops (~9% loss) when de-encapsulating in hardware — the inner mux is then undecodable despite perfect RF. The demod emits raw BBFrames instead and the server rebuilds the outer TS losslessly, then decapsulates T2-MI as usual. Applied per-tune, so the same card still serves normal-TS transponders at the same time. For MIS carriers set the PLS as plsm=gold&plsc=<code>.

http://SERVER:8875/?src=1&freq=11727&pol=v&sr=30000&msys=dvbs2&mtype=8psk&fec=34&pids=all&t2mi_pid=auto&t2mi_plp=0&t2mi_pids=all

http://SERVER:8875/?src=1&freq=11727&pol=v&sr=30000&msys=dvbs2&mtype=8psk&fec=34&pids=all&t2mi_pid=auto&t2mi_plp=0&t2mi_pids=0,1,17,18,4112,4128

http://SERVER:8875/?src=1&freq=12606&pol=v&msys=dvbs2&mtype=8psk&sr=35300&fec=23&ro=0.35&isi=5&plsm=gold&plsc=131070&bbframe=1&pids=all&t2mi_pid=4096&t2mi_plp=0

7.MPS decapsulation

MPS feeds wrap a nested inner transport stream inside an outer PID (a different encapsulation from T2-MI). SAT>IP Server Pro extracts the nested TS server-side, with optional BISS descrambling for protected contribution feeds.

mps_pid

Outer PID carrying the nested inner TS. Enables MPS decapsulation.

mps_sid

Optional outer service-ID hint.

inner_sid

Optional inner service / program number to extract.

inner_pids

PID selection on the extracted inner TS (default all).

http://SERVER:8875/?src=1&freq=12226&pol=v&sr=30000&msys=dvbs2&mtype=8psk&fec=56&isi=20&pids=all&mps_pid=8001&inner_sid=1

Multiple MPS sub-streams often share one physical frequency on different mps_pid values (e.g. 8001 / 8002 / 8003) — each is its own decapsulation, so provision one tuner per mps_pid to serve them concurrently.

8.Encrypted feeds & BISS

Decapsulation unwraps the container — it does not, by itself, decrypt content. If the inner stream is scrambled, it must be descrambled to produce a playable TS.

biss

BISS key for BISS-scrambled feeds (contribution links, some MPS or T2-MI payloads).

biss_mode

BISS mode selector.

biss_refresh

Key-refresh interval control.

9.T2-MI / MPS Channels Analyzer

The Channels Analyzer scans an encapsulated stream and returns every service, PID, bitrate and encryption flag — so you know exactly what to decapsulate before you build the playback URL.

Access: Admin Panel → Tools → T2-MI Channels Analyzer. Input: a full-transponder URL (pids=all). Output: a formatted service list.

# Source: .../?freq=12226&msys=DVBS2&mtype=8psk&fec=56&isi=20&sr=30000&pol=V&pids=all
# Scanner: T2MI (PID=4096, PLP=0)
 Srv Id   Service Name     Access   Bitrate
 0x0015   Новий канал      C       2,145,803 b/s
 0x0016   TET              C       2,694,486 b/s
 0x0017   2+2              C       2,666,440 b/s
 0x0019   НТН              C       2,692,994 b/s
 0x001B   ПЛЮСПЛЮС         C       1,717,507 b/s
 0x001E   ICTV2            C       1,702,291 b/s

Access: C encrypted (conditional access) · F free-to-air. Feed the discovered PIDs into t2mi_pids (or inner_pids for MPS) to stream individual programs.

10.PID filtering & duration

By default the server streams the whole transponder. Request specific PIDs to save bandwidth, and bound scans with a duration.

• pids=all — entire transponder (default)
• pids=0,1,16,17,18 — metadata only (PAT, CAT, NIT, SDT, EIT)
• pids=0,17,100,101,200,201 — metadata plus specific channel PIDs

Scan duration: use 10–15 s for reliable channel discovery (enough to capture PAT/PMT/SDT/NIT); 20–30 s for full EPG and names.

11.Complete examples

Standard DVB-S2 transponder

http://SERVER:8875/?src=1&freq=11954&pol=h&sr=27500&msys=dvbs2&mtype=8psk&fec=34&pids=all

Multistream with ISI

http://SERVER:8875/?src=1&freq=12536&pol=h&sr=35300&msys=dvbs2&mtype=8psk&fec=23&isi=9&pids=all

Multistream with PLS gold

http://SERVER:8875/?src=1&freq=11470&pol=v&sr=27500&msys=dvbs2&mtype=8psk&fec=34&plsm=gold&plsc=131070&pids=all

T2-MI — direct decapsulation

http://SERVER:8875/?src=1&freq=11727&pol=v&sr=30000&msys=dvbs2&mtype=8psk&fec=34&pids=all&t2mi_pid=auto&t2mi_plp=0&t2mi_pids=all

MPS — nested TS extraction

http://SERVER:8875/?src=1&freq=12226&pol=v&sr=30000&msys=dvbs2&mtype=8psk&fec=56&isi=20&pids=all&mps_pid=8001&inner_sid=1

Channel scan — metadata only

http://SERVER:8875/?src=1&freq=11954&pol=h&sr=27500&msys=dvbs2&mtype=8psk&fec=34&pids=0,1,16,17,18

12.Troubleshooting

Diagnose incrementally: start with basic parameters and pids=all, confirm lock and SNR in the Satline.tv dashboard, then add advanced parameters one at a time.

13.Best practices

• Document your URLs — keep a register keyed by satellite position + frequency (e.g. 5W-12536H-isi9).
• Validate in VLC first before deploying to middleware.
• Monitor signal — set SNR/BER alerts in the Satline.tv admin panel.
• Prefer multistream transponders for bandwidth efficiency; provision one tuner per ISI/mps_pid when you need several concurrently.
• Rescan periodically — broadcasters change parameters; a monthly rescan catches drift.
• Provision redundancy for mission-critical channels.
• Scan generously — 15–20 s captures complete PSI/SI; capture pids=all first, filter later.

14.Resources

• LyngSat, KingOfSat, FlySat — transponder databases (frequencies, PIDs, ISI values).
• SAT>IP Specification — protocol reference.
• DVB-S2X (ETSI EN 302 307-2) — advanced modulation.
• T2-MI (ETSI TS 102 773) — T2 Modulator Interface.