By PURPLELEC | 06 January 2024 | 0 Comments
What does the video codec stream mean?
Data rate refers to the data traffic used by video files in unit time, also called bit rate. It is the most important part of picture quality control in high-definition codec. At the same resolution, the larger the code stream of the video file, the smaller the compression ratio and the better the picture quality. Video bitrate and code stream are just two terms for the same problem. For example, an MPEG2 video file generally contains not only video information but also audio information. The audio also has its own bitrate. This is a file that combines audio and video information. This The code stream of a file is the sum of its audio and video code streams.
The rate at which a digital channel transmits digital signals is called the data transmission rate or bit rate.
The word bitrate has many translations, such as code rate, etc., which indicates how many bits per second the encoded (compressed) audio data needs to be represented, and bits are the smallest unit in binary, either 0 or 1.
Simply speaking, the relationship between bit rate and audio and video compression is that the higher the bit rate, the better the quality of the high-pitched video, but the larger the encoded file will be; if the bit rate is lower, the situation is just the opposite.
For example: encoding audio and video at 500Kbps, where 1KB/second = 1024*8bps, b is the bit, s is the second, and p is per (per). Therefore, encoding at 500kbps means after encoding The audio and video data needs to be represented by 500K bits per second.
For audio, code stream = sampling rate × number of bits × channels. Therefore, for common CD format audio, its code stream is: 44100 × 16 × 2 = 1.41Mbit/sec.
In actual webcast applications, due to differences in the network environments of visitors at different network locations, webcast streaming media transmission with only a certain fixed code stream resolution will often result in images seen by users with higher network speeds. The quality is still not clear enough. Users with low network speeds take too long to decode and the picture is not smooth enough. In order to solve the contradiction between the two and enable visitors to browse as clear and smooth live content as possible, multi-stream technology is adopted to become The simplest and most effective way.
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