[MPlayer-advusers] lavc ratecontrol bug

[RC]

Okay, this bug is VERY specific.  It's no wonder nobody noticed it, even
though it's been around for at least a month...

If using scplx_mask (eg. =0.1) while encoding with mpeg1/mpeg2 video,
the video bitrate will quickly climb extremely high (3000) and stay
there, despite the vbitrate setting (700 in my case). 

Simple to reproduce:  mencoder -ovc lavc -lavcopts
vcodec=mpeg1video:vbitrate=700:scplx_mask=0.1

This does NOT happen with the mpeg4 codec, or if "trell" is
used in with mpeg1/2.  It's only because "turbo" turns off trell for
vpass=1 that I experienced the bug myself.