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Encoding video at a constant bit rate

When encoding video content at a constant bit rate, you specify the average bit rate that you want to maintain and then set the size of your buffer. The bit rate fluctuations during the encoding session will be constrained by the given buffer size. Specifying a constant bit rate causes the image quality to fluctuate in order to ensure that the buffer does not overflow or underflow.

Note   Audio is always encoded at a constant bit rate

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