This file was appearently generated by one of Matrox' tools. It is a mpeg2video encoded clip that allegedly uses B-frames and a gop_size of 4. Its time base is 4/25 or 6.25 fps, and plays as such. It should appearently be 25 fps though. The INFO chunk indicates that this file was muxed with lavf 52.68.0, so it can't be older than June 4th 2010 (r23474).