FWIW..... The file TrustedComputing_LAFKON_MID_theora.avi contains magic that seems to imply TrustedComputing_LAFKON_MID_theora.avi: RIFF (little-endian) data, AVI, 320 x 240,25.00 fps, video:, audio: MPEG-1 Layer 3 (stereo, 24000 Hz) I downloaded a "real" Theora video file... [egreshko@misty ~]$ file 01intro.ogg 01intro.ogg: Ogg data, Theora video And played it just fine with both xine and mplayer....