三菱着手开发全新S-AWC四驱系统 将引入电动机驱动

百度 黄子韬在音乐结束后愤怒说道：我现在特别生气！他提到这是他整场看到最烂的表演，我不知道你们在干嘛，你们有3个是我选的，你们是来玩的吗？韩庚试图缓解尴尬的氛围，才一出声是这样的，子韬……立刻就被阻止，你让我说完行吗？哥！他继续说：你们今天的舞台真的是乱到爆！我真的太失望，因为我对你们抱太大希望！最后是易烊千玺化解尴尬，给了队伍一些称赞，我看出不太一样的感觉，但可能不尽人意。

Constant bitrate (CBR) is a term used in telecommunications, relating to the quality of service. Compare with variable bitrate.

When referring to codecs, constant bit rate encoding means that the rate at which a codec's output data should be consumed is constant. CBR is useful for streaming multimedia content on limited capacity channels since it is the maximum bit rate that matters, not the average, so CBR would be used to take advantage of all of the capacity.

CBR is not optimal for storing data as it may not allocate enough data for complex sections (resulting in degraded quality); and if it maximizes quality for complex sections, it will waste data on simple sections.

The problem of not allocating enough data for complex sections could be solved by choosing a high bitrate to ensure that there will be enough bits for the entire encoding process, though the size of the file at the end would be proportionally larger.

Most coding schemes such as Huffman coding or run-length encoding produce variable-length codes, making perfect CBR difficult to achieve. This is partly solved by varying the quantization (quality), and fully solved by the use of padding. (However, CBR is implied in a simple scheme like reducing all 16-bit audio samples to 8 bits.)

In the case of streaming video as a CBR, the source could be under the CBR data rate target. So in order to complete the stream, it's necessary to add stuffing packets in the stream to reach the data rate wanted. These packets are totally neutral and don't affect the stream.

See also

• Bitrate
• Average bitrate
• Variable bitrate
• Bit stuffing