a tool to check how much bitrate is needed by a video?

[Kumo]

i'm looking for a way to know how much bitrate is really needed to encode a source into x264 via megui.there's any tool that analyze the source to understand how much is the needed bitrate(video compressibility)?

[Brother John]

Sounds like your looking for the compressibility check (compcheck, comptest). StaxRip has this feature