When utilizing StreamFab to download Amazon Prime videos, one can choose between bitrate adaptability in CVBR and CBR modes.
(Note: When downloading newly released videos, the video quality in CBR surpasses that of CVBR, although the audio quality in CBR is inferior to that of CVBR. For instance, in the same video, the audio of CVBR is EAC3 640 kb/s, while that of CBR is EAC3 224 kb/s or AAC.)