To get the same bitrate as original file.
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Constant Bitrate means that every frame gets the same amount of data, regardless of need.
2 Pass Variable Bitrate means that the video is compressed around an average bitrate, with some frames getting more and some getting less data, as needed.
Both will give you a target file size.
If the source was encoded with a constant bitrate, then encoding it again with the same bitrate will give you the same file, but may result in reduced quality.
If the source used a variable bitrate then using a variable bitrate again will give you the same file size, but the indivual frames won't be encoded with the same bitrates.Read my blog here.
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Only if you are doing a two pass constant bitrate encode.
Constant bitrate is just that. A constant bitrate across all frames. A two pass encode is used to better distribute bitrate through the video. This allows the encoder to give higher bitrate to more complex scenes, while allocating a lower bitrate to less complex scenes. You end up with a video that has scenes with close to a constant quality.
CBR=Constant bitrate rate variable quality. All scenes receive the same amount of bits regaurdless if they need it or not.
VBR=Variable bitrate rate, almost constant quality. Best used with a min/max/average, especially if encoding for STB compliance, so you don't overshoot the upward bounds of max bitrate decoding.
Fixed Quant=variable bitrate with a constant quality across all scenes.
If quality is most important with little regaurd to size, fixed quant encoding will yield the best results. If size is important, 2 or more pass VBR encoding with an average bitrate targeting the final size is what you want. CBR is just a waste of bits, and really should not be used unless the targeted playback mechanism mandates it (VCD, some streaming protocols, a few hand helds)Linux _is_ user-friendly. It is not ignorant-friendly and idiot-friendly.
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