rc_min_vbv_overflow_use in AVCodecContext, and use their values in the
ratecontrol code rather than hardcoded ones.

See the thread: "[RFC] ratecontrol buffer size magic".
Patch by Baptiste Coudurier.

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these were wrong (in pts vs dts sense) when b frames were in use
they were also wrong if the average framerate was smaller than 1/timebase
resulting in totally wrong final bitrate

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fixes sf bug #797610

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and fix GPL/LGPL version mismatches.

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put it in a separate file.

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- warn rather than fail when specified bitrate need not be used
- fail with a useful message when specified bitrate is too low
- print potentially useful information if verbose

patch based mostly on suggestions from Michael Niedermayer and Loren Merritt

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compiled with xvid support.

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Ministry of English Composition, reporting for duty (and the word is "skipped", not "skiped"; "skiped" would rhyme with "hyped")

Originally committed as revision 4153 to svn://svn.ffmpeg.org/ffmpeg/trunk