Today, security managers and professionals are turning to many options for their digital CCTV. , While this is a slightly larger investment, but also largely increase the quality, flexibility and efficiency through a variety of options and different characteristics. One of these options is the ability to select the format to compress video
On your computer download a variety of video, if you look at each of these by right clicking and selecting'Properties', you will notice that some of them are different types of files. These range from. WMV. MPEG. AVI and each has different characteristics. That this refers to the type of video compression '. If you look at the size (in terms of kilobytes or megabytes) that the size of the image, you can see why it is important that these images somehow "cut" to save space where potentially millions of them strung together to create a video. This is thelevel code (the language of the video device or computer law), but can become visible in the video 'as the apparitions-out faded colors, lower resolution, or motion blurred edges. The goal is to strike a satisfactory balance between image quality and file size to find - so you can store as much information on a hard disk or a floppy disk, without sacrificing too much detail.
When recording with a DVR (digital video recorder), it works in much the sameroad and the video is compressed when saved. Only in cases of CCTV, type of compression is much more important because you do not deal only with large amounts of footage (sometimes it is worth hours and hours'), but also delicate situations with the highest frame rates and resolutions require correctly identify the problems. For these reasons, when buying a DVR, it is very important to discover the types of compression that supports it (sometimes abbreviatedin video format) and what are the different titles.
The two main types of compression format for digital CCTV to 'H.264' and 'MPEG' (AKA Motion JPEG, and that usually meant MPEG2). The most important thing to note, however, is that H.264 is also known as MPEG4 format, which means that it is actually an updated version of the new format. H.264 video compression format, and dramatically reduces the bandwidth and storage of fileskeep them small, while maintaining high quality. However, this usually translates into a lower "bit rate" for the video information means less 'bits' of the second provision, but the encryption method ensures that these lost 'bits' are useless (eg, high frequency ). With an average of up to four cameras to thirty frames per second and a resolution of 320 x 240 (with motion sensors), you can expect 80 hours of MPEG4 movies with a valueat 20-25 GB.
But unlike MP2, MP4, no government has applied the rules and as such has no universal exchange between codecs with various designs. This means that MP2 is more flexible and adaptable, with a higher bitrate and operating its unique advantages. Fortunately, most cameras now support both formats and even if no file conversion is often available.
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