Both VBR and ABR are relative to CBR. It is the oldest and simplest coding technology. When encoding this method, the bit rate of the entire file is the same. In other words, the number of bits used per second for MP3 files. It's all the same. Although music files have different levels of complexity, the encoder always keeps the bit rate consistent. Unless you use the highest sound quality, the sound quality of different paragraphs in the MP3 file will change. The more complicated the passage, the worse the sound quality. The biggest advantage is that the file size is fixed, so that we can calculate the storage space.
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