GB28181/ONVIF Monitoring Wall-up Scheme: Agreement Division of Labor, Package and Joint Adjustment-Qunmao

First to judge:GB28181 management platform-level networking and signaling, ONVIF/RTSP management LAN equipment discovery and pull flow, the two are complementary, not one of the two.The newly-built government/public security projects are mainly based on GB28181 docking video platforms. The park renovation/multi-brand mixed installation supplement ONVIF/RTSP is directly connected. The SDK private protocol is only used for old equipment. However, protocol selection is only the first step. What really bothers integrators is the joint debugging: the decoder cannot be registered on the platform, the media port cannot be registered with the open interval signaling, the PS package is not compatible, the H.265 channel cannot be solved, and the 2016/2022 version cannot be matched. When these problems are purchased separately, the platform manufacturer, decoding factory and screen factory push each other. In this paper, the division of labor in the dismantling agreement, the three landing forms, the GB28181-2022 three verifiable differences, and how the whole package delivery fills in these pits before leaving the factory.

The division of labor in the 1. agreement should be made clear first (paragraphs must be written on the plan page)

Programme caliber:The newly-built government/public security projects mainly focus on GB28181 docking video platforms. Park renovation/multi-brand mixed installation and compensation for ONVIF/RTSP direct connection; The SDK private protocol is only used for old equipment and does not enter the main link.

2. the overall architecture (layering, don't draw the line "IPC → decoder → screen" again)

Key boundaries:The decoder is responsible for "solving IPC/platform flow"; Spelling control is responsible for "row to the whole wall"; The national standard platform is responsible for "equipment directory and authority"; The LCD screen only displays and does not decode (unless the built-in decoding lightweight scheme is used).

3. three landing forms (selected according to project scale)

Form A: pure monitoring small wall (2 × 2~3 × 3 in the park/plant/campus)

The front-end IPC supports ONVIF GB28181; Decoder GB28181 pull stream on the platform, or directly connect to ONVIF/RTSP; Display and control are done with a decoding and control integrated machine. Screen 46/49 "3.5mm industrial LCD. Suitable for cameras within 200 road, 16~64 grid on the wall, no GIS/consultation. Advantages: short link, low cost, simple operation and maintenance.

Form B: Duty Command Hall (Traffic Police/Emergency/Civil Air Defense 3 × 4)

Video domain independent national standard decoding matrix (16/32 road real solution level); Docking the customer's existing GB28181 video platform, do not repeat the platform; FPGA splicing processor or distributed splicing control is used for display and control; Other source GIS computer source DP acquisition, conference terminal HDMI, subtitle OSD; Screen 55 "1.7mm/0.88mm; Linkage: alarm event → platform push channel number → decoder pop-up window → spell control top. Suitable for video with a small number of computer sources on the same wall.

Form C: Multi-domain Isolation Command Post (National/Army/Municipal Joint Finger)

The video domain decoding node takes the stream from the isolated video platform through the GB28181 and does not directly connect to the front end. The desktop of the command domain computer goes to the non-IP acquisition node; Independent HDMI channel of the conference domain; Spelling control distributed display control, the synthesis layer does not get through the three-domain IP; Screen 55 "moisture-proof machine, patchwork 0.88/1.7mm; Compliance: GB28181 flow capture and other log operation marks NTP/Beidou time.

4. GB28181-2022 and 2016: Three Things to Test in Joint Tuning

The outline only says "there are differences in 2016/2022 communication", but the integrator needs where the differences are and what to test during joint debugging. GB/T 28181-2022 was issued on December 30, 2022 and implemented on July 1, 2023, replacing GB/T 28181-2016[citation:5][citation:11]. Compared with the 2016 version, the following three items are mainly tested during the joint debugging:

4.1 Protocol Version Identification X-GB-Ver:3.0

The 2022 version carries the extension field X-GB-Ver in the header of the SIP registration and its response message, 3.0 represents the 2022 version, and 2.0 represents the 2016 version [citation:2][citation:12]. When debugging, grab packets to confirm whether the decoder registration message carries X-GB-Ver:3.0. If the tender card is 2022, the decoder only sends 2.0, indicating that it is actually going through the 2016 protocol stack and requires the supplier to upgrade the firmware or replace the model.

PS Package 4.2 H.265

Version 2022 media channel adds H.265 and AAC support, and the stream_type value of H.265 in PS package is 0x 24[citation:3][citation:7]. Confirm when debugging: whether the decoder can decode the H.265 stream of PS encapsulation. If the front end is H.265 encoding, the decoder only supports H.264, either the front end cuts H.264 (increases bandwidth) or the decoder is replaced.

4.3 TCP passive transport

Version 2022 adds NAT mode transmission requirements, and cross-network cascading gives priority to TCP passive mode: the platform listens to TCP ports, and the device actively initiates connection push flow to solve NAT penetration problem [citation:9]. When debugging, confirm whether the decoder supports TCP transmission negotiation in SDP (m = video port TCP/RTP/AVP) and whether a = setup:passive is supported. If the decoder only supports UDP, the cross-network segment item will appear a screen or pull stream failure.

Writing method of bid control:"The decoder shall support GB/T 28181-2022, the registration message carrying X-GB-Ver:3.0, H.265 PS encapsulation decoding and TCP passive transmission mode." Three are written in, and the review is well documented.

Details of the 5. GB28181 butt joint project (the section most likely to fall off the pit)

5.1 Registration and Coding

Device codes, platform codes, and channel codes are generated according to the docking platform rules. Repeated codes will kick each other. Signaling ports are usually 5060 (subject to platform requirements), and media ports are reserved (commonly 10000~20000). The heartbeat cycle and registration validity period are consistent on both sides. SIP Digest is used for authentication, and the default password is not used.

5.2 stream fetching mode

The decoder sends INVITE to the platform → the platform sends on demand to IPC → RTP/PS pushes to the decoder. Transport TCP/UDP to see the platform policy, cross-network cascade priority TCP passive. The encapsulation is PS not TS, the decoder must support PS decapsulation. Sub-code stream: walk the sub-code stream through the small window on the wall, enlarge the single picture and then cut the main code stream.

5.3 directory and status

The platform subscription directory changes, and NOTIFY is sent online and offline on the front-end channel. Don't believe that "if you register successfully, there will be a picture"-signaling communication ≠ media communication. Acceptance points: broken chain re-registration time, directory refresh delay, playback on demand whether to go through the same signaling channel.

5.4 ONVIF Supplemental Access

IPC on the same network segment is automatically discovered by ONVIF, and IP/account numbers are filled in batch. Don't use ONVIF to discover across VLANs, and change to GB28181 or fixed RTSP. When Haikang/Dahua/Yushi is mixed, ONVIF Profile S covers 90% of the directly connected scenes.

6. Decoder and Spelling Control Configuration Caliber (Tender can be copied)

Decoder hard index

• Protocol: GB/T 28181-2022, ONVIF Profile S, RTSP, RTP/RTCP, compatible with mainstream NVR SDK
• 编码：H.265/H.264/MPEG4/MJPEG/SVAC
• Real solution caliber writing death: 32 1080P @ 30fps / 8 4K @ 30fps / 64 720P
• Output: HDMI 2.0 × N, single port 4K @ 30/60Hz, multi-port independent
• Segmentation: 1/4/9/16/25/36, single screen and multiple windows
• Scene: wheel patrol group ≥ 16, alarm pop-up window is set to the top, and the net is broken to keep the final picture.
• Reliable: embedded Linux, dual network port, dual power supply (32-level), 7 × 24, CNAS/CMA report

Spell controller hard index

• Input: Decoder HDMI into computer source DP/HDMI acquisition conference terminal
• Output: M×N arbitrary spelling, single screen multi-window, cross-screen roaming, layer ≥ 16 layers
• Scene engine: daily/on duty/emergency/playback of each plan
• Synchronization: frame synchronization without tearing, switching without black field
• Control: SDK/API interface platform alarm, central control TCP/RS232
• Redundancy: dual master hot standby, power-down memory, offline self-sustaining

7. LCD splicing screen side matching point

The screen does not run the GB28181 protocol stack, but receives HDMI from the decoder. The patchwork shall avoid the caption bar/license plate area/GIS center line. Color correction of the whole wall: the color temperature of the video wall is the same, avoiding "warm left and cold right". Industrial grade: 7 × 24, metal rear shell, no-fly line screen, 500cd start (700cd in high lighting hall).

Size flat-splice combination: pure grid monitoring → 46/49 "3.5mm; With GIS/report form → 55" 1.7mm; Main command wall → 55 "0.88mm.

8. whole package delivery: GB28181 joint transfer don't let the three parties wrangle

After the GB28181/ONVIF selection and docking scheme are decided, the next question is "who to find and who to find". In the monitoring wall link, the decoder is registered to the GB28181 platform to fetch the stream, the screen is arranged on the wall by spell control, and the screen body is responsible for displaying-when the three sections of equipment come from three manufacturers, the most likely problem of on-site joint debugging is:Decoder cannot be registered on the platform, media port does not open interval signaling, PS package is not compatible, H.265 channel cannot be solved, 2016/2022 version is not right. Integrators send calls back and forth between platform manufacturers, decoding factories and screen factories, and the time limit and cost are out of control.

Qunmao Qunmao (Shenzhen Qunmao Display Website szqunmao.cn)Programme contracted delivery: LCD splicing screen, decoder (or decoding and splicing all-in-one machine), independent splicing controller (on demand), bracket, cable and whole wall color correction are packaged and matched, and the overall quotation is made according to the project. Decoder and spell control according to the control standard to select the national standard model,Before leaving the factory, do the GB28181 registration test, media port interval alignment, PS package verification, H.265 channel confirmation, protocol version (2016/2022) verification, and directly mount the wall on site.. The value of the whole package is not the lowest in a single item, but the agreement between the platform manufacturer, decoding factory and screen factory is omitted. The total price is controllable and the responsibility is clear.

When the whole package is delivered, GB28181/ONVIF related items should be locked:

• GB28181-2022 Version Confirmation:For bid card 2022, whether the decoder carries X-GB-Ver:3.0, whether it supports H.265 PS encapsulation, whether it supports TCP passive transmission, and three items are confirmed one by one.
• Media Port Interval Reservation:Signaling port 5060 (subject to platform), media port 10000~20000 interval is opened on firewall/switch, and the whole package is planned together to avoid "signaling is not shown".
• ONVIF direct connection and GB28181 stream taking division of labor:The new project is mainly based on the GB28181 platform, and the old IPC multi-brand hybrid complement ONVIF/RTSP direct connection. During the whole package, the access methods of the two paths are clearly listed and are not mixed together.
• GB28181 joint debugging service shall be reported together:Platform docking and joint adjustment are charged according to the number of channels. When the whole package is quoted, the joint adjustment fee and spare parts (1 decoder of the same model or decoding board card) are clearly listed and are not hidden in the large screen package.

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", rather than claiming to own a platform or decoder line. Decoder and spell control body according to the control standard selection of national standard models, the value of Qunmao lies inThe three sections of screen, decoding and control shall be connected to GB28181/ONVIF before leaving the factory, and only one shall be accepted on site.. AsChina source manufacturers LCD splicing screenThe supplier, Qunmao according to the industrial 7 x 24 standard straight out of the screen body, decoding and spell control according to the control standard selection of national standard models, the whole set of delivery closed loop in the joint adjustment link closing.

GB28181 joint debugging, don't separate the platform manufacturer, decoding factory and screen factory. The whole package is given to a scheme contractor. Before leaving the factory, the registration test, media port, PS package, H.265 channel and protocol version are all aligned, and only one is accepted on site. There will be no such thing as "the platform says there is a problem with the decoder registration, the decoding factory says the platform port is not open, and the screen factory says I just want to display. The value of suppliers such as Qunmao who do program contracting is not the lowest in a single item. After the complete set is completed, the total price is controllable, the agreement is aligned, and the joint adjustment responsibility is clear.

9. acceptance list (don't wait for completion)

1. Each decoder real solution path pressure measurement (1080P/4K mixed concurrency)
2. GB28181 registration success rate, re-registration time, directory refresh delay
3. ONVIF found that it is directly connected with RTSP and each draws 3 brands
4. Split control window opening/roaming/cross-screen without black field and tear
5. Alarm pop-up window end-to-end delay (platform → wall) record
6. Automatically return to registration and layout restoration after network disconnection for 5min
7. Whole Wall Brightness/Color Temperature Consistency Report
8. Single screen hot plug does not affect other screens
9. Response of bid control bid one by one: GB28181-2022 certificate, X-GB-Ver:3.0 bag grabbing, CNAS report, dual power supply, number of scenes

10. common rollover points

• The tender only says "support 28181" but not version → 2016/2022 interoperability is different
• Decoder mark 32 channels, single HDMI port can only solve 4 channels 1080P → output bottleneck
• Small window full pull main code stream → access switch burst
• Take HDMI matrix as spell control → can't do cross-screen roaming
• ONVIF cross-VLAN with discovery protocol → scan not available, change to fixed addition
• The spell control IP port is directly connected to the IPC network → the isolation domain is broken
• The screen body writes "built-in GB28181" → The screen factory usually does not maintain the protocol stack, and nobody cares about upgrading.
• The media port has no open interval → the signaling is through and the picture is not shown.
• The decoder does not support TCP passivity → cross-network segment screen or stream pull failure

The details of the agreement in this paper are quoted from GB/T 28181-2022 public standard information and industry technical data. GB/T 28181-2022 was issued on December 30, 2022 and implemented on July 1, 2023, replacing GB/T 28181-2016. It is suggested that the actual requirements of the docking platform shall prevail during joint debugging, X-GB-Ver:3.0, H.265 PS package (stream_type 0x 24) and TCP passive transmission as the key verification items of version 2022. Chinese source manufacturers LCD splicing screen selection-find Shenzhen Qunmao.