The role of popular high-definition audio and video codec technology

High-definition audio and video codecs are network transmission devices that compress digital video and process audio and video data. In the process of network transmission, what is more important is the clearness of the video picture and the difference in broadband during the processing of the video. Let's take a closer look at the basics of audio and video codec technology:

Frame rate: The so-called frame rate is the number of images in one second. The video is composed of one image. Therefore, the frame rate concept is used in the capture and playback coding. That is, the frequency (rate) of the video on the display. The higher the acquisition frame rate, the better the reduction.

Bit rate: Bit rate is the concept of video transmission. It refers to the bit rate transmitted per second and the amount of data sent in one second. In real-time applications, adaptive bandwidth has always been the goal of the encoder's rate control algorithm. It is the concept of compression ratio, such as the amount of binary data after a frame of video (an image) is encoded and compressed. In channel coding, a source data block of K symbol size is mapped to a codeword of N symbol size by encoding, and K / N becomes the code rate.

Resolution: Resolution is the definition of video, ultra clear, high definition and the like. Common are:

720P (ultra-clear) film source requires 4M

1080P (Full HD) film source requires 8M bit stream

4K (Ultra HD) source requires 10M bitstream

Lossless / lossless coding: In digital compression technology, lossless and lossless coding applications can be seen everywhere, and the encoding of information in the transmission process without loss of decoding will completely restore the original information, which is lossless coding. Lossy coding is more commonly seen in the compression of multimedia information such as images, videos, audios, etc. Because the original information of multimedia information is too large, it is necessary to lose unobservable information during the encoding process, and the lost data cannot be recovered, and the compression is relatively large.

H.264 / H.265 encoding technology :

H.264 encoding is a low-latency high-definition video image processing algorithm and a standard H.264 video compression algorithm;

H.264 can realize SD digital image transmission at a speed lower than 2Mbps, while H.265 HighProfile can realize 1080p Full HD video transmission at a transmission bandwidth lower than 1.5Mbps.

H.264 encoding and H.265 encoding are both video encoding formats. Compared with H.264, H.265 can transmit higher-quality network video in a limited bandwidth, which means that only half the bandwidth of the original H.264 encoding can transmit the same quality video.

The role of audio and video encoders

1. The video encoder is mainly used for digital high-definition encoding of high-definition digital television adjacent-frequency front-end system, IPTV live broadcast system and network live broadcast.

2. As long as it is digital video, it needs to pass the HD signal of the video encoder. Zero delay is better for live broadcast.

3. The live encoder can receive HDMI high-definition digital signals output from HDMI high-definition cameras, HDMI set-top boxes, and computer hosts through the HDMI video input interface. After receiving the video signal, the encoder can encode the video information through the built-in professional video processor. After the encoder is processed, it can be pushed to the live server through the WIFI network.

Video encoder: It is a compression program.

Video decoder: is a decompression program.

Mainly used in scenarios

Broadcasting, broadcasting, video conferencing, security monitoring, medical teaching, classroom recording and broadcasting, and other software and hardware supporting services under various environmental conditions. In communication and network, it is also suitable for real-time system control and industrial automation systems.

Which is the best audio and video codec?

The goal of video compression is to reduce the video data rate while ensuring visual effects as much as possible.

The video codec requires high stable real-time transmission, choose a professional factory direct sales, and have a professional R & D team technology.

To have high compatibility, various types of network video codecs.

Supported protocols, output with common protocols such as RTMP / HLS / RTP / RTSP / NDI / SRT.