The H.264 compression standard for DVRs
H.264 is a standard digital video encoding of video surveillance systems that is remarkable by a high compression rate being widely used in digital DVR video recorders.
The principle of recording images transmitted by video surveillance cameras
The data volume sent by video surveillance cameras can be reduced by different encoding methods. The most common method is to remove information that remains unchanged from one frame to another, which has a major impact on the amount and quality of coded image processed by video surveillance systems through DVR digital video recorders.
In H.264, frames captured are compared to the reference frame, and only pixels that have changed their value will be encoded and transmitted to the record. LogicalGate CCTV installers London.
Compared to the H.264 recording standard, video surveillance systems with video codecs with MJPEG codec encode and transmit all the picture, frame with frame, the volume of information being considerably increased.
Video recording with MJPEG codec vs MPEG-4 vs H.264 codec
Advantages of DVR recording with MJPEG codec
1. The standard is suitable for recording with DVR digital video recorders to high resolution video surveillance cameras.
2. Get superior image quality.
3. Supports a large number of video surveillance cameras at which recording and viewing can be done up to 30 fps (real time).
4. Good decompression and low delays when viewing recorded video with digital video dvr.
5. Supports motion detection and image analysis of video surveillance cameras.
The main disadvantages of video surveillance systems equipped with DVR video with MJPEG standard are the need for a large storage space and a wide bandwidth.
Advantages of recording with MPEG-4 compression video recorders
1. The standard achieves a much better compression of DVR captured images from video surveillance cameras and can maintain the constant transfer rate.
2. Allows audio-video synchronization of the signal transmitted by video surveillance cameras with audio.
3. Allow streaming for general viewing of video surveillance video images.
The image quality stored by DVRs is lower compared to MJPEG. The standard is not designed for video analysis and is not suitable for megapixel video surveillance cameras. MPEG-4 shows higher decompression and higher delays.
Advantages of recording with H.264 digital video dvr
1. It is the standard with the best compression of images transmitted by video surveillance cameras and recorded with digital video dvr h264.
2. It does not require broad bandwidth and storage space is low.
3. Enables a constant transfer rate and audio-video synchronization for video surveillance cameras with audio.
4. H.264 is designed for viewing and recording images from real-time video surveillance cameras with the dvr h264 digital video recorder. Provides a streamlined flow protocol.
Like its predecessor MPEG-4, the H.264 standard has storage problems for large systems (fragmentation) and delays are higher.
With the emergence of the H.264 standard, MPEG-4 has dramatically lost its popularity and applicability for DVR video surveillance systems and digital video recorders.
If you want audio & video synchronization, then H.264 is the ideal solution for video surveillance cameras with audio.
H.264 soon became the most widely used DVR standard and is found in most video surveillance devices on the market today.