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In the live broadcast platform, the use of audio and video technology is essential to ensure the clarity and fluency of live video pictures. Audio and video technology mainly refers to audio technology and video technology, the two in the live processing process is similar, generally divided into five big steps: data acquisition, coding, transmission, decoding and rendering. Today, what are the audio and video codec technologies used in the development of live broadcast systems?

Video codec technology

In fact, video coding and decoding are implemented according to a certain algorithm, which is also a coding and decoding algorithm based on the analysis of audio and video information. The coding algorithm can compress the video information and remove the redundant information, so as to facilitate the transmission of audio and video information, while the decoding algorithm is to decode the transmitted audio and video information to facilitate the client to watch. Digital video codec technology is the initial development condition of network television, only efficient video coding can ensure the provision of high-quality video services in the Internet environment. Without compression, the amount of data of digital video is huge, so it is difficult to transmit or store it. Choosing the appropriate video coding can greatly improve the efficiency of video transmission.

Audio codec technology

The principle of audio codec is similar to that of video codec, and it is transmitted by compressing audio. But the algorithm is diverse, the complexity is higher than video, and different scenes need to choose different audio decoders. There are three common implementation schemes of audio codec: the first is to use a special audio chip to collect and process the audio signal, and the audio codec algorithm is integrated in the hardware, such as MP3 codec chip, speech synthesis analysis chip and so on; the second scheme is to use AMagar D acquisition card and computer to form a hardware platform, and the audio codec algorithm is realized by computer software. The third scheme is to use the high-precision, high-speed Ahammer D acquisition chip to complete the speech signal acquisition, use the programmable chip with strong data processing ability to realize the speech signal processing algorithm, and then use ARM to control.

Software and hardware codec technology

In the process of video app development, there are two kinds of audio and video codec: software codec and hardware codec, which is a concept encountered when watching video through mobile devices. Hardware decoding is used to decode video through hardware and is carried out by GPU. GPU can reduce the workload of CPU and play video smoothly but the picture quality is not clear enough. Software decoding is carried out through the CPU occupied by the software itself, so it will increase the workload of CPU, but the picture quality is relatively clear.

Audio and video encryption technology

Audio and video encryption is mainly to protect copyright. At present, many LVB platforms have added video caching, so some videos can only be viewed after payment. In order to prevent users from paying for download and spreading the video, you need to encrypt the video file, so that the video can only be played in the application of this platform.

The above is just the application of audio and video codec technology in the live broadcast platform. Of course, in the whole process of developing a complete live video broadcast app, more technologies are needed to support it.

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