The video effect is the core and vitality of the digital host. When you look at the real-time and clear images on the monitor, the playback effect may not be good. The most important aspect of the evidence collection effect is the video effect. Generally, the video effect is more important than the monitoring effect. Most DVR videos can be recorded at 25 frames per second in real time. Some video recorders have a total resource of less than 5 frames per second. Usually, the resolution is CIF or 4CIF. One channel camera requires about 180MB~1GB of hard disk space for recording for one hour;