CONSTANT BIT RATE (CBR) ENCODING PERSISTS THE SET DATA RATE TO YOUR SETTING OVER THE WHOLE VIDEO CLIP. USE (CBR) ONLY IF YOUR CLIP CONTAINS A SIMILAR MOTION LEVEL ACROSS THE ENTIRE DURATION. (CBR) IS MOST COMMONLY USED FOR STREAMING VIDEO CONTENT USING THE FLASH MEDIA SERVER (RTMP)VARIABLE BIT RATE (VBR) ENCODING ADJUSTS THE DATA RATE DOWN AND TO THE UPPER LIMIT YOU SET, BASED ON THE DATA REQUIRED BY THE COMPRESSOR. (VBR) TAKES LONGER TO ENCODE BUT PRODUCES THE MOST FAVORABLE RESULTS. (VBR) IS MOST COMMONLY USED FOR HTTP DELIVERY IF VIDEO CONTENT (HTTP PROGRESSIVE)(VBR) STANDS FOR VARIABLE BITRATE. AS WITH (VBR) VIDEO ENCODING, THE IDEA IS THAT THE ENCODER USES ONLY THE BITRATE REQUIRED TO ENCODE THE DATA, USUALLY BASED AROUND A MINIMUM, MAXIMUM AND AVERAGE VALUE. THE RESULT CAN BE HIGHER QUALITY AT THE SAME AVERAGE BITRATE AS (CBR), OR THE SAME QUALITY AS (CBR) AT A LOWER AVERAGE BITRATE.(CBR), OR CONSTANT BITRATE, USES A SINGLE BITRATE REGARDLESS OF THE NEEDS OF THE TRACK.(CBR), ON THE OTHER HAND, IS PRETTY UNIVERSAL, AND ANY MP3 DEVICE WILL HAPPILY READ AND PLAY (CBR) ENCODED FILES