presumably to reduce the size of the log file.
However, it doesn't clear stats_out on the other 31 out of 32 frames.
So the application (ffmpeg and mencoder) writes each stat line 32 times.

bugfix by (Loren Merritt <lorenm at u dot washington dot edu>)

Originally committed as revision 3475 to svn://svn.ffmpeg.org/ffmpeg/trunk