How does video compression work? It uses a codec to go through the original video files to reduce or get rid of unnecessary files. How does it do this? It does so by compressing the original files into a format that is smaller. The reason to do that is to allow us to store more videos in our NVR or to our cameras MicroSD card. All of us can relate to being in a position where we wished we had more storage devices. Using video compression gets rid of that. There are various types of compression including but not limited to H.264, H.265, and MJPEG. Surveillance cameras do this automatically. Additionally, one can choose what kind of compression is used by the camera.
What is MJPEG
The full form of MJPEG is motion JPEG. The way this works is by going through each frame, the video is compressed and then they are sent as JPEG images. This method is used by video capture devices such as IP cameras, digital cameras, and webcams. Web browsers like Microsoft Edge, Mozilla Firefox, and Google Chrome support it.
H.264 is the standard used by the entire industry for video compression and it was developed in 2003. Where is it used? It is commonly used in recording and compressing video content. The best-known examples would be YouTube, iTunes, and Vimeo.
This kind of system was developed for the broadcast industry. The people that made this were ITU- video coding Experts Group. H.265 builds on the H.264 compression system as it generates a better quality of images. While doing so, it tries to keep the size of the video as small as possible. How does it do that? It uses half the bit rate of H.264 and that is how they reduce bandwidth and storage requirements.
How does compression affect audio?
If you are recording audio along with your video, the files for the audio will have a separate compression system than the video files. It also depends on how many video streams the camera has. If a camera has multiple video streams, it is possible that the camera might be able to use multiple video compression codecs. How does it impact you? It can allow you to configure for viewing live, on mobile, or to be kept in long term storage.
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