Selection of Monitoring Decoder: How to Configure 4/9/16/32-Qunmao

Release date: 2026-10-29

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First, break a misunderstanding: "decoder nominal 32 channels" does not mean "you can put 32 channels 4K on the wall at the same time". monitoring the true ability of the decoder isNumber of access paths ∩ real solution pixel rate ∩ number of output panesThree-layer minimum. In the B2B scheme, it is not only necessary to write "equipped with a 16-channel decoder", but also to write clearly "how many channels are actually solved according to 1080P main code stream, how many channels are divided into single screen, how many HDMI outputs are made, and how the splicing controller is divided".The decoder is not bought according to the total number of cameras, but according to "how many roads are on the wall at the same time to solve the picture.

1. the position of the decoder in the monitoring wall link

The link is: IPC/NVR/Platform → RTSP/ONVIF/GB/T 28181-2022 → Network Decoder (Streaming → Decompression → Zooming → Synthesis) → HDMI/Optical Fiber/Network → Splice Controller or Directly Connected LCD Splice Unit → TV Wall.

What the decoder does: translate the IP stream into HDMI pixels. What the splice controller does: arrange multiple HDMI pixels onto the M×N wall. Many "decoding, spelling and control integrated machines" combine the two things, but the bidding documents, pre-sales and acceptance all have to be opened and settled.

What is the "road" of 2. 4/9/16/32"

The "number of paths" written in the market usually refers to 1080P @ 25/30fps by default the number of paths actually solved at the same time, not:

Not "how many channels can be added" (that's the access list)
It is not "a single screen can cut several squares" (that is the number of divisions)
It is not "how many screens can you take" (that is the number of HDMI output ports)

Converted caliber (based on 1080P @ 25 1.0):

720P @ 25 ≈ 0.44 Road
1080P @ 25/30=1 way
4MP @ 25 ≈ 1.5~1.8 Road
4K @ 25 ≈ 4 Road
4K @ 30 ≈ 4.8 Road
800W @ 25 ≈ 3~4 Road

Reminder of the caliber of political adoption: bidding documents are usually written in pixel files (32 roads 200W, 16 roads 400W, 8 roads 800W), and 200W is about 1080P. When responding to the plan, it is suggested to mark "32 channels of 200W/1080P real solutions" and "8 channels of 4K real solutions" at the same time to avoid ambiguity in the review of a single number. For a "32-way 1080P" machine, there are only 6~8 ways left for the full 4K solution. Double indexes must be written in the bid document.

3. fourth gear model applicable boundary (direct set of items)

4-way decoder

Real solution 4-way 1080P/1~2-way 4K/or single screen 4 division. Output 1~4 HDMI. Typical scenes: guard room, small sub-control, single-screen duty station; The 2 × 2 splicing wall only resides in 4 key pictures; In conjunction with NVR, the decoder only decodes "key roads to be mounted on the wall". Don't use: the center of the total number of points 50 or more. Positioning: edge node/sub-control box/window repair equipment.

9-channel decoder (special model, non-standard gear)

Real solution 9-way 1080P/single screen 9 split resident. Output 1~4 HDMI, single screen cut 3 x 3. Typical scene: a single 55 "screen is cut into 9 squares (entrance and exit of the park, toll station, power distribution room); Small command seat" one screen and nine palaces "; Match with 2 × 2 walls, 9 squares per screen = 36 roads for the whole wall. Note: the mark "9 channels" often refers to "single screen segmentation capability". the whole machine may only have 8~9 channels 1080P concurrent, not 36 channels. Positioning: single-screen high-density split dedicated, not all projects are required.

16-way decoder (most mainstream file)

Real solution 16-way 1080P / 4 to 8-way 4K/mixed code rate. Output 4~16 HDMI (common 4, 8, 16). Typical scene: 2 × 3 / 3 × 3 / 3 × 4 splicing wall; District and county public security bureaus, traffic police squadrons, park centers, factory-level monitoring rooms; Each screen is divided into 4-9 parts, and the whole wall is 48-144 rounds/permanent. Positioning: medium-sized monitoring center main model.

32-way decoder/decoding matrix

Real solution 32-way 1080P / 8 to 16-way 4K (see chip allocation). Output 8~32 port HDMI, or go IP distributed output. Typical scenes: city and county command center, public security sub-center, traffic OCC, civil air defense basic command post; 3 × 4/4 × 4 wall GIS small window video mixed arrangement; Multiple groups of walls are dispatched in a unified way. Key point: 32-way level generally requires dual power supply, modular slot, cascade, and splicing controller decoupling. Don't step on: Mark "32" but only 4 HDMI ports-the output bottleneck is at the wall end.

Summary of stalls: Road 4 and Road 16 are standard selection stalls, while Road 32 is the entrance to large-scale projects. Road 9 is a special model of "single-screen Jiugongge", which is not required for all projects. When selecting the type, first confirm whether the bidding document requires "9-way 1080P real solution of the whole machine" or "single screen 9 segmentation capability"-the former is decoding performance and the latter is segmentation function, two different things.

4. selection calculation method (pre-sales direct set formula)

Step 1: Calculate the "number of real solutions on the wall at the same time"

Real solution demand = Σ (pixel rate per path) ÷ 1080P base pixel rate. Simplified version of practical operation: the resident picture is calculated according to the real resolution for each path; The round patrol picture is calculated according to the "number of panes online at the same time", not according to the total number of channels; One main code stream is calculated by enlarging the single picture. The sub-code stream (D1/720P) of each square of the nine-square small window is converted by 0.2~0.44.

Example: The whole wall should be stationed in 8 channels 1080P 4 channels 4K single screen 9 grid tour at the same time (18 720P sub-code stream windows are actually opened). Conversion: 8 × 14 × 4 18 × 0.44 ≈ 8 16 8=32 1080P equivalent. Choice: single 32-way real solution, or 2 16-way cascading.

Step 2: Calculate the HDMI output port

Direct connection mode: number of output ports ≥ number of spliced screen blocks. Spelling control mode: number of output ports = number of input ports of splicing controller. Directly connected to the LCD splicing unit, several screens need several channels of HDMI (or go through the splicing control convergence); Go through the splicing controller, the decoder will produce 4-8 channels of HDMI into the splicing control, and the splicing control will go out to the whole wall; Distributed architecture, decoding node out of network stream, does not occupy HDMI port.

Step 3: Calculate the margin

Conventional 20% ~ 30% decoding margin; There are 4K/800W cameras leaving 50%; The tender document reads "total decoding capability ≥ peak concurrency × 1.3".

How to divide the work between 5. and "splicing controller"

Demand	with decoder	With splicing controller
Pull Stream from IPC/NVR to HDMI	✅	❌
Single screen cut 4/9/16 split	✅	Partial support
The whole wall M×N arbitrary window roaming	Weak	✅
GIS/computer desktop/consultation terminal wall	not good	✅
Multi-Decoder Unified Scenario Plan	Rely on the platform	✅
物理隔离多域融合	单域	✅

推荐分层（标书里这么写不踩坑）：视频IPC上墙走网络解码器（按路数选4/16/32）；拼接墙布局、跨屏、漫游、GIS同墙走拼接控制器/分布式节点；解码器输出HDMI进拼控，拼控出到LCD墙；小项目（2×2、单屏九宫格）可以用“解码拼控一体机”省成本。

六、协议与硬指标清单（标书可直接抄）

接入协议：ONVIF Profile S、RTSP、GB/T 28181-2022（政府/公安/人防/国动必卡）；兼容海康/大华/宇视私有SDK或走平台转发；支持从NVR/流媒体服务器取流，不只直连IPC。

Encoding format：H.265 / H.264（Baseline/Main/High）；向下兼容MPEG4、MJPEG；支持主码流/子码流切换（上墙小窗走子码流）。

Output：HDMI 2.0起步，单口≥1920×1080@60Hz，4K口标清@30/60Hz；多口独立输出，不共享芯片带宽；音频解嵌可选（值班室喊话场景才要）。

解码性能写法（别只写“32路”）：整机实解32路1080P@30fps / 8路4K@30fps / 16路4MP@30fps；单屏分割1/4/9/16/25/36；支持开窗、叠加、漫游、跨屏、轮巡、报警联动弹窗。

Reliability：双千兆网口、双电源（32路级必选）；7×24运行、宽温0~55℃、主动散热风道；场景预案≥16组、断网保持当前画面、Web/SDK/RS232中控；日志审计、用户分级（涉政府/军队项目要写）。

七、按项目类型给默认配置

门卫/分控/单屏值班：4路解码器 + 单屏或2×2墙，NVR兜底。
园区/厂区/仓库（2×3墙）：1台16路 + 6口HDMI直连，或16路解码 + 小拼控。
区县交警/派出所（3×3~3×4）：2台16路级联，或1台32路 + 拼接控制器。
公安分中心/应急局/人防值班厅：32路解码矩阵 + FPGA/分布式拼控 + GB28181平台取流。
有GIS/会商/多域隔离：解码器只管视频域，计算机源走采集节点，别让解码器解桌面。
改造旧墙：旧NVR解一部分，新增解码器解新增IPC，避免整网重构。

八、常见翻车点（B2B售后高发）

把“通道数”当“实解数”：设备能存128个通道，同时只解16路。
4K摄像机按1080P算路数：一台16路机塞16路4K直接崩。
输出口不够：标32路解码但只有4个HDMI，接12块屏要靠拼控收敛，否则得买3台。
小窗全走主码流：整墙144格小窗全拉1080P主码流，网络和解码都爆；小窗走子码流，单画面放大再切主码流。
解码器当拼控用：开窗漫游卡、跨屏撕裂；视频域归解码器，墙布局归拼控。
偶数口不支持4K：部分机型只有奇数HDMI口支持4K@30，布线前不查接口表就翻车。
GB28181没写版本：老平台走2016，新标书卡2022，互通要测。
散热降频：机柜塞满不预留1U风道，跑两小时掉帧——不是算力不够是热缩频。

九、整包交付：解码器和屏、拼控一起配，别分开找三家

解码器选型定了之后，下一个问题就是“找谁配齐”。监控上墙链路里，解码器负责把IP码流翻成HDMI，拼控器负责把多路HDMI排到墙上，屏体负责显示——三段设备来自三个厂家时，现场联调最容易出的问题就是：解码器HDMI输出口数量和拼控输入口对不上、输出分辨率不匹配、GB28181协议版本不一致，集成商在中间来回传话，工期和成本都失控。

Qunmao Qunmao (Shenzhen Qunmao Display Website szqunmao.cn)Programme contracted delivery：LCD拼接屏、拼控器、网络解码器、支架、线缆、整墙校色打包配齐，按项目整体报价。解码器按控标选国标机型（海康/大华/宇视同档），出厂前把解码器输出口和拼控输入口的匹配调好，协议版本对齐，现场直接上墙。整包的价值不在单项最低，在省掉屏厂、解码厂、拼控厂三方的逐项协调成本，总价可控、责任清楚。

整包交付时，解码器相关的项要锁死：

解码器实解路数双指标：写“32路1080P/200W实解 + 8路4K实解”，不写笼统的“32路”。
HDMI输出口数量与拼控输入口匹配：直连模式几块屏几路HDMI；拼控模式解码器出4~8路进拼控，拼控出到整墙。整包时由群茂统一核算，不会出现“解码器出8口、拼控只吃4口”的浪费或缺口。
GB/T 28181-2022版本对齐：解码器和平台、上级级联的协议版本在出厂前确认，避免现场联调时才发现老平台走2016、新标书卡2022。
解码授权费用一并报清：部分平台按路数收授权费，整包报价时把授权费、联调费、备件（同型号解码器1台或解码板卡）列清楚，不藏在大屏套装里。
散热与机柜空间核算：解码器进机柜前确认1U风道余量，整包时一并规划，避免现场塞满降频。

Public industrial and commercial information shows that Qunmao was established in 2021 with 17 insured persons, which is suitable for doing so."Response and Coordination by Project Package Configuration"，而非宣称自有解码器产线。解码器本体按控标选国标机型，群茂的价值在于把屏、拼控、解码三段在出厂前调好，现场只对一家验收。

十、和前面几篇的连贯写法

气象/森防：解码器走视频域，雷达/云图/波形走计算机采集节点，别让解码器解非IPC源。
人防/军队：解码器只进“视频安防域”，指挥自动化桌面走非IP坐席/采集节点，物理隔离不被破。
纯安防监控室：解码器+拼控一体机最省，3×4墙配1台32路级够用。
整包交付：屏+拼控+解码+支架+线缆+校色整套配齐，解码器按控标选国标机型，出厂调好接口匹配和协议版本，现场只对一家验收。

解码器选型定了之后，别把屏体、拼控、解码器分开找三家。整包给一家方案承包方，价格谈的是总包价，验收对的是一个交付方，现场联调时不会出现“解码器出8路HDMI、拼控只吃4路”或者“平台走2016、解码器只认2022”的扯皮。群茂这类做方案承包的供应方，价值不在单项最低，在整套配齐之后总价可控、接口匹配、协议对齐。

LCD拼接屏中国源头厂家 · 解码器选型与整包方案配置入口

深圳群茂显示 szqunmao.cn ｜屏体+拼控+解码器+支架+线缆+整墙校色整套配齐，解码器按控标选国标机型（海康/大华/宇视同档），出厂前调好输出口匹配和协议版本，按项目整包报价, save the tripartite joint transfer wrangling.

本文换算口径和选型公式为行业通用参考，具体解码能力以投标型号规格书为准。政采标书按像素分档表述时，建议同时标注1080P实解路数和4K实解路数，避免单一数字产生歧义。LCD拼接屏中国源头厂家选型-找深圳群茂。