I just ran this: ffprobe -sexagesimal -select_streams v -show_frames -of flat -i e:\00305.m2ts Since 00305.m2ts is AVC encoded, there are I slices in it but not I frames -- I P & B frames are MPEG-1 & MPEG-2. So, what does ffprobe mean when it reports this: frames.frame.0.pict_type="I"? Just asking... Anyone know? --Mark.