Constraints and Limitations

Updated on 2024-04-03 GMT+08:00

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VIAS has certain constraints and limitations, some cost-related and some technological. System-wide constraints affect all sub-services. Additionally, sub-services are subject to their respective constraints.

System-Wide Constraints

Supported video formats include AVI, WMV, MPG, MPEG, MP4, MOV, M4V, and MKV.
Supported frame rates include 12, 24, 25, and 30 fps.

Decoding is supported for H.264 and H.265 videos.

Encoding Format	Resolution
H.264	720P, 1080P, 2K, 4K
H.265	720P, 1080P, 2K, 4K

Constraints of Algorithm Services on Cameras

**Table 1** Constraints
Object	Constraint
Camera installation height and angle	Camera installation height: 3 m to 5 m Tilted angle: 10° to 40°
Lighting and orientation	Adequate lighting at night or in poorly lit indoor environments is required, so that targets are clearly visible in video footage. Avoid direct exposure to strong light. After installation is complete, make sure the camera lens is not exposed to harsh light, such as sunlight or street lamps. Avoid light reflections. Keep the camera away from highly reflective objects such as glass, ceramic tiles, water, leaves, signboards, and advertisements.
Camera resolution and image quality	The camera resolution should be at least 1080p. The video footage must be clear and free from artifacts and overexposure.
Camera installation location	The detection area must not have objects (such as trees) blocking the camera's line of sight. The location must meet the installation requirements (for example, poles and walls are available for camera installation).

Constraints and Recommendations on Edge Node Servers

Edge nodes where VIAS is running support Ascend and x86+GP Tnt004 servers.

To use Ascend servers, Atlas 800 AI server (model 3000) is recommended.
- VIAS supports the c82 driver of Ascend inference chip (download path: c82 driver). If the Ascend chip driver of the current server is not of the c82 version, install the c82 driver.
- On edge node servers, the default ID of the Ascend driver user group HwHiAiUser is 1001. Do not change the value. Otherwise, algorithm jobs may run abnormally. The ID of the HwHiAiUser user group supported by VIAS is 1001, 1000, or 10001.

To use x86+GP Tnt004 servers, RH2288 V5 and Atlas G5500 are recommended. CentOS 7.x is recommended for the server operating system. If Tnt004 servers are used, download the recommended Tnt004 driver version.

**Table 2** Recommended server type
Server Model	Description	NPU/GP
Atlas 800 AI server (model 3000)	CPU: 2 x Kunpeng 920 5220 Memory: 256 GB DDR4 Hard disk: 2 x 480 GB SATA-SSD + RAID 0/1/5 Atlas 300I Pro: up to eight cards supported NIC: 2 x dual-port 25GE NIC (Mellanox CX4)	Altas 300I Pro
Atlas G5500	Operating system: CentOS 7.x/ Ubuntu 18.04/Ubuntu 16.04/RHEL 7.x (CentOS 7.x is recommended.) CPU: two Intel® Xeon® SkyLake 6161 v5 CPUs Memory: 128 GB Hard disk: 2 x 1.2 TB (RAID1) system disk + 1 x 500 GB data disk Graphics card (Tnt004): up to eight cards supported (The server supports a maximum of 16 graphics cards. However, only eight graphics cards are supported due to the limitation of CPU cores.) NIC: 2 x 10GE	GP Tnt004
RH2288H V5	Operating system: CentOS 7.x/ Ubuntu 16.04/RHEL 7.x (CentOS 7.x is recommended.) CPU: two Intel® Xeon® Gold 6154 CPUs Memory: 64 GB Hard disk: 2 x 600 GB (RAID1) system disk + 1 x 500 GB data disk Graphics card (Tnt004): up to two cards supported NIC: 2 * GE	GP Tnt004