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What's the difference between Amazon CBR and CVBR?

Bitrate adaptation can be selected between CVBR and CBR when downloading Amazon Prime video. (Note: When downloading the latest released video, the picture quality of CBR video is higher than that of CVBR, but the sound quality is lower than that of CVBR. For example: the same video, the audio of CVBR is EAC3 640 kb/s and the audio of CBR is EAC3 224 kb /s or AAC.).

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