VBR
VBR (variable bit rate) dynamic bit rate. That is, a bit rate is not fixed.
The audio encoding software immediately determines which bitrate to use based on the complexity of the audio data during encoding. This is an encoding method that is premised on quality and takes file size into account.
Table of Contents
1 Definition
dynamic bit rate
other meanings
2 differences
3 principles
4 Other acronyms
definition
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dynamic bit rate
VBR is also called dynamic bit rate encoding. Using this method, you can choose various transition levels from worst sound quality/maximum compression ratio to best sound quality/minimum compression ratio. When encoding the MP3 file, the program will try to preserve the quality of the entire selected file, the encoding will choose different bit rates suitable for different parts of the music file. The main advantage is that the sound quality of the entire song can approximately meet our quality requirements, but the disadvantage is that the compressed file size cannot be estimated during encoding.
Bitrate is the bitrate (speed) of the waveform [be careful not to confuse with sample rate, MP3 sample rate is generally 44.1 KHz and some higher ones are 48.0 KHz ], sound is naturally a waveform, that is, vibration. The vibration is drawn as an oscillating curve and the computer is on this curve when saved.
The best (highest) mp3 bitrate is 320 kbps (i.e. 320 kilobits per second), the waveform below 320 kbps will be corrupted and a lot of non-sharp detail will be lost (wave clipping) , while 320 kbps MP3 encoding mainly compresses treble details. Above 320 kbps, only a few programs support encoding, and the sound quality improvement is not obvious, so it is better to use lossless compression.
The higher the bitrate, the more accurate the waveform reproduction and the less distorted the sound. VBR is a technology that does not allow all music to take the same bit rate. The encoder determines the bit rate according to the complexity of the audio. Through dynamic adjustment, the music bitrate is high at complex places and the bitrate at simple places is low, so files of the same size will sound higher quality.
other meanings
VBR variable diameter gate (variable bore ram). Oil vocabulary in English (V1)
the difference
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For video, VBR is different from fixed bitrate mode, and its bitrate can vary with image complexity, so its encoding efficiency is relatively high, and there are few mosaics of fast-moving images. When compressing, the encoding software immediately determines which bitrate to use based on the video data, not only ensuring quality but also taking file size into account. In this way, the encoding program can choose from the worst video and audio quality (usually the highest compression ratio) to the best video and audio quality (usually the lowest compression ratio) among various video qualities. When encoding a video file, the encoding program tries to maintain the selected quality of the entire file by choosing different bit rates to encode different parts of the video file.
