IPTV Glossary 2026: 35 Terms Explained
Definitions, mechanisms and primary-source references for the protocols, codecs and reseller concepts behind IPTV delivery: Xtream Codes, HLS and M3U8, MPEG-TS, HEVC and AV1, XMLTV EPG, FEC, DNS over HTTPS, Stalker portals, reseller credits and more. Each term has seven angles, from plain definition to developer reference.
Xtream Codes API Protocol
A REST-style HTTP API used by IPTV panels to authenticate a line and deliver live, VOD, series, and EPG metadata as JSON.
M3U8 HLS Playlist Structure
An M3U8 file is the UTF-8 manifest format defined by RFC 8216 for HTTP Live Streaming.
EPG XMLTV Feed Format
XMLTV is the de facto open XML schema for electronic programme guide data.
Catch-up TV / Timeshift Server
Catch-up (nDVR) is server-side recording of a live channel into a ring buffer so subscribers can replay programmes from the last 1-7 days.
Reseller Credits & Wholesale Arbitrage
A reseller credit is the unit of inventory in an IPTV panel: one credit creates or extends one subscriber line for one month on one connection.
Anti-Freeze Packet FEC Technology
Anti-Freeze describes a bundle of transport techniques that prevent visible stalls: Forward Error Correction parity packets, dual-source ingest with automatic failover, BBR congestion control on origin servers, and a 5,000 ms client jitter buffer..
White-Label DNS Rebranding
White-labelling lets a reseller present the service under their own brand by pointing a custom hostname (CNAME) at the provider edge and distributing a branded player APK, so subscribers never see the upstream domain..
Sub-Reseller Hierarchy & Commissions
A sub-reseller hierarchy is a tree of panels where a Master reseller allocates credits to sub-resellers at a marked-up price, and each level manages its own customers while the panel enforces credit accounting at every tier..
Stalker Portal Middleware (MAG)
Stalker (now Ministra) is a middleware portal originally built by Infomir for MAG set-top boxes.
Bouquet Management & Category Masking
A bouquet is an ordered set of channel categories assigned to a subscription package.
HEVC / H.265 4K Compression
H.265 (ITU-T H.265 / MPEG-H Part 2) is the High Efficiency Video Coding standard that delivers the same perceptual quality as H.264 at roughly half the bitrate, making 4K60 delivery feasible at 18.5 Mbps.
AV1 Next-Gen Streaming Codec
AV1 is the royalty-free video codec from the Alliance for Open Media, delivering about 30% lower bitrate than HEVC at equal quality.
Adaptive Bitrate Streaming (ABR)
ABR encodes each channel into a ladder of renditions (e.g.
RTMP vs HLS Latency
RTMP is a persistent TCP streaming protocol with 2-5 seconds of latency, used for encoder ingest; HLS is segment-based HTTP delivery with 12-18 seconds of standard latency or 3-4 seconds in Low-Latency mode.
UDP Multicast vs Unicast OTT
Multicast sends one MPEG-TS stream to a group address and relies on IGMP-capable routers to replicate it, which only works inside managed telecom networks.
MPEG-TS Transport Stream Packets
An MPEG-2 Transport Stream (ISO/IEC 13818-1) is a sequence of fixed 188-byte packets beginning with the 0x47 sync byte, a 13-bit PID, and a 4-bit continuity counter.
DNS over HTTPS (DoH) Bypass
DoH (RFC 8484) carries DNS queries inside HTTPS to a resolver such as 1.1.1.1, preventing ISPs from observing or altering lookups.
Deep Packet Inspection (DPI) Circumvention
DPI appliances classify traffic by inspecting TLS Server Name Indication, flow patterns, and destination ASN, then shape or block flows that match streaming signatures.
IP Lock vs Multi-Device Connections
IP lock restricts a subscription line to a single public IP address, while max_connections limits simultaneous streams regardless of IP.
Cloudflare WARP & WireGuard Tunneling
WireGuard is a kernel-level VPN protocol using the Noise handshake and ChaCha20-Poly1305 encryption; Cloudflare WARP is a consumer client built on it.
MAC Address Virtual Binding
Virtual MAC binding is how Smart TV and app-based players emulate a Stalker set-top box: the app generates a 48-bit MAC (often with the 00:1A:79 prefix) that the reseller registers in the panel as the device credential..
Electronic Program Guide Offset
EPG offset is the per-channel or global time shift a player applies to XMLTV timestamps so programmes align with the local clock.
GPU Transcoding with NVIDIA NVENC
NVENC is the hardware video encoder on NVIDIA GPUs used by panels to transcode ingest feeds into HEVC/H.264 bitrate ladders in real time.
Load Balancing with NGINX Stream Proxy
Panels place NGINX in front of origin servers to distribute subscriber sessions across edge nodes, cache HLS segments, and terminate TLS.
EPG Source WebGrab+Plus
WebGrab+Plus is the most widely used grabber for building XMLTV guides.
DRM: Widevine & FairPlay Protection
Widevine (Google) and FairPlay (Apple) are DRM systems that encrypt media with CENC keys and release them only to trusted decoders.
CDN Edge Caching for Streaming
Edge caching stores HLS segments and manifests at points of presence close to subscribers so that each segment is fetched from origin once and served thousands of times locally, reducing origin load and round-trip latency to 11-24 ms in major metros..
HLS vs DASH Manifest Parsing
HLS uses text M3U8 playlists and MPEG-TS or fMP4 segments; MPEG-DASH uses an XML Media Presentation Description with fMP4 (CMAF) segments.
Multicast DNS (Bonjour / Zeroconf)
mDNS resolves .local hostnames on a LAN using multicast to 224.0.0.251 port 5353 without a DNS server.
Bitrate Ladder & Chunk Manifest
A bitrate ladder is the set of renditions encoded for one channel, each with a resolution, frame rate, and bitrate, listed in the HLS master manifest so the player can adapt.
RTSP (Real-Time Streaming Protocol)
RTSP (RFC 2326 / RFC 7826) is a control protocol on TCP 554 that negotiates and controls RTP media sessions with DESCRIBE, SETUP, PLAY, and TEARDOWN commands.
Token Authentication Middleware
Token middleware issues short-lived, signed tokens for stream URLs so that credentials are not embedded in shareable links.
M3U Extended Attributes
The #EXTINF line in an M3U playlist carries key=value attributes that players use for metadata: tvg-id (EPG mapping), tvg-name, tvg-logo (icon URL), group-title (category), and optional tvg-shift for EPG offset.
EPG ID Channel Mapping Matrix
The mapping matrix links each stream tvg-id to a <channel id> in the XMLTV guide.
User-Agent Spoofing
The User-Agent header identifies the player to the server.
Glossary FAQ
What is the difference between Xtream Codes API, M3U URL, and Stalker Portal login?
All three deliver the same channels. Xtream Codes API uses player_api.php JSON endpoints so the player lazy-loads categories and EPG in seconds. An M3U URL (get.php) downloads a single text playlist of every stream, which is slow with 45,000 channels but works on any player. Stalker Portal authenticates by MAC address through a /c/ portal URL and is used by MAG receivers and some Smart TV apps.
Why is my EPG guide empty or showing programs at the wrong time?
Players fetch an XMLTV file from xmltv.php and match each channel by tvg-id. An empty guide means the player downloaded the file before the server finished its 15-minute refresh or the file exceeded the player size cap (set TiviMate EPG update to "never limit"). Wrong times are a timezone offset issue: XMLTV timestamps carry +0000 and the player must apply your local offset, so set an EPG shift of +1 or -5 hours in the channel settings rather than changing the device clock.
How far behind live are IPTV sports streams and can latency be reduced?
Standard HLS with 4-second segments and a 3-segment player window sits 12-18 seconds behind the broadcast. Low-Latency HLS with 0.5-second partial segments brings glass-to-glass delay to about 3.8 seconds, and raw MPEG-TS over HTTP (.ts output format) is typically 5-7 seconds behind. Choose the .ts output format in your player for live sports and reserve .m3u8 for VOD and catch-up.
What buffer size should I set in TiviMate, Smarters, or XCIPTV for 4K sports?
Set the largest option (5,000 ms in TiviMate, "Large" in Smarters). Buffer time in seconds equals buffer bytes multiplied by 8, divided by the stream bitrate in Mbps: a 15 MB allocation on an 18.5 Mbps 4K feed yields 6.5 seconds of protection, which covers typical ISP shaping bursts of 2-4 seconds without a visible freeze.
WireGuard vs OpenVPN: which VPN protocol is better for 4K IPTV?
WireGuard. It runs in the Linux kernel, uses a 4,000-line codebase with ChaCha20-Poly1305 encryption, and adds roughly 1-3 ms of latency with 5-8% throughput overhead, so an 18.5 Mbps 4K stream passes untouched. OpenVPN in TCP mode suffers from TCP-over-TCP meltdown during packet loss and typically costs 20-35% throughput; use OpenVPN only in UDP mode with tls-crypt on networks that block UDP port 51820.
Every external citation on this page points to a primary source: telecommunications RFCs, ITU-T and ISO codec standards, manufacturer and developer documentation, national regulators, or official sports governing bodies. No commercial IPTV competitor is cited.