2-pass allows you to get the highest video quality possible by completing the video transcoding process twice. The first pass calculates video rate distortion characteristics using specific quantified parameters. These calculations help you to select the best settings for the second pass so that you can minimize quality fluctuations between the video frames.
In a nutshell, the first step deeply analyzes the video to see where the video bits are different, and the second step brings balance by equally distributing those same bits.
Coconut's online video converter offers this 2-pass video encoding feature so that you will get the best video quality for your project. You can access this option through our powerful and flexible video encoding API or on the graphic interface.