min = FFMIN(min, avfilter_poll_frame(link->src->inputs[i]))
which, since FFMIN is a macro, was calling itself
twice for every input, causing an exponential cost in time.


git-svn-id: file:///var/local/repositories/ffmpeg/trunk@20295 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b