You can play back 1, 2, or 3 cameras fine, but adding one more triggers the block. This article explains why this happens, the architectural limits, and how to bypass or optimize it.
You are viewing playback on the local HDMI monitor (using 8 channels), while a remote user via iVMS-4200 is also playing back 8 channels. Total = 16, hitting the decoder limit. hikvision maximum number of channels under playback reached
Impact on operations
: Lowering the playback quality (resolution and frame rate) can help if you're struggling with high-bandwidth demands. You can play back 1, 2, or 3
Hikvision devices have specific "Decoding Capabilities." Every time you play back a recorded clip, the device’s processor has to work in real-time to decompress that video data. There are three main reasons you hit this limit: 1. Hardware Decoding Limits Total = 16, hitting the decoder limit