With the continuous development of audio and video coding technology and broadband network technology, the demand for video transmission implementation is increasing. The basic concept of high-definition video codec is a dedicated device that encodes and processes audio and video data sources for network transmission, and then restores network video sources to large screen displays through a decoder.
Video encoder decoder basic composition.Video encoder decoder consists of video capture, video transmission, video storage and processing, video display and other functions. Currently, most video encoder decoders use various encoding technologies such as MJPEG, MPEG4, H264/H265, etc. to encode video data.
As the video data captured by the front camera is very large, it is necessary to use mature coding technology to compress the video data at a high compression ratio that meets the technical requirements of network transmission, and then use the decoder to decompress the network video and present it to the large screen.
Video coding technology, also known as compression method, is the technical core of video encoder decoder and the primary selection for choosing network video codec equipment. Currently, popular digital compression encoding formats include H.264 and H.265. H.264 reduces the bit rate while improving the image quality by increasing the complexity of operations. It provides a solution for low bit rate network transmission and makes it possible to apply multiple network video servers under the existing bandwidth. The quality of the H.265-encoded video can approximate or even exceed that of the H.264-encoded video. It can be seen that H.265 is an improved version of H.264, and the compression ratio of the algorithm has been greatly improved. H.265 aims to transmit higher quality network video under limited bandwidth.
The future direction of network IP transformation. From digital broadcasting program production to broadcasting, matrix-based technical architecture can no longer meet the needs of both technological and business development. The transformation of infrastructure to IP is inevitable. The IP network architecture is relatively simple, with flexible network configuration, low wiring difficulty, and easy maintenance. The IP link can support multiple SD-SDI , HD-SDI or 3G-SDI signals simultaneously, and support long-distance transmission. The system has strong scalability, and the expansion of programs only requires the connection of gateway devices, which can achieve smooth upgrades from standard-definition television to high-definition and ultra-high-definition television. NDI is the standard of IP stream, which makes efficient transmission of videos in IP space a reality, and can largely replace current industry-specific connections and transmissions, such as HDMI , SDI, etc.
After the audio and video signals are encoded with NDI, they can be transmitted and received in real-time through IP network with multiple broadcast-level quality signals, while having features such as low latency, precise frame video, mutual recognition and communication of data streams. NDI's application refreshes our understanding of traditional system signals and production pipelines. It simplifies the construction of systems and the transmission, calling, and reuse of various signals within the system, making system design, integration, application, maintenance, and functional expansion simpler and more flexible.
