DVRs that are not equipped with RTOS systems simply decrease recording parameters, e.g.
playback of archives) to ensure proper recording of video even with the maximum quality requirements. In practice - DVR will delay less important operations (e.g. Real-time algorithms enable the system to perform critical tasks in precisely defined periods of time. Any delay will cause loss of video data (e.g. Recording of the signals in digital form (with set parameters: resolution, frame rate, number of channels) is a priority and has to be performed in real time. The example is conversion and compression of analog video signals. For RTOS it is important to take into consideration the time factor - positive result of operations depends not only on the sequence, but also on the time of completion. In industrial applications of computers, operating system decides on the sequence and way of performing the tasks. It determines the overall quality and stability of the device. Operating system is the core of every digital recording device. H.264 is currently the only compression that allows to build 16-channel DVRs capable of recording 4CIF video (PAL 704x576) at frame rate 25 fps, as well as providing effective network transmission of live and recorded images. The parameters are about 30% better than in the case of "normal" MPEG-4 compression.
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It is clear that H.264 algorithms, used in 3rd generation DVRs, ensure the best results - the lowest bandwidth and disc space requirements, the shortest download time. The diagrams below present rough comparison of some parameters (for similar image quality) when using different versions of MPEG compression (implemented in different DVRs). Recording of dynamic scenes requires efficient difference algorithms that are implemented in MPEG wavelet compression systems. M-JPEG and M-JPEG 2000 systems, where each video frame is separately compressed as a JPEG image, are usually used for low frame rates, offering single frames of high quality (e.g. Kind of video compression is one of the key factors influencing the overall quality of recorded video.
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