![]() 2 pass encoding is often used while specifying a target (average) bitrate or a file size. Variable bitrate: The bitrate varies so theoretically the quality remains constant throughout the encode. Whether it's noticeable will depend on how high the constant bitrate is. More bits than necessary here, maybe not enough there etc. As each video will compress differently, the bitrate required for a given quality will change with each encode.Ĭonstant bitrate: The birate is constant so the quality will vary throughout the encode. When you specify the quality the unknown becomes the bitrate. ![]() When you specify a file size (or bitrate) you're effectively specifying the quality without knowing what it'll be. And given the goal is AVI I assume you're re-compressing video encoded with the x264 encoder while using an mpeg4 encoder (Xvid/Divx etc) which is older and less efficient. It just comes down to how hard the video is to re-compress. The bitrate of the source video has nothing to do with the bitrate required to re-compress it. ![]()
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