Yves Degoyon wrote: > MEncoder 1.0rc1-3.4.2 (C) 2000-2006 MPlayer Team > > very old system here... still ah i see: MEncoder dev-SVN-rUNKNOWN-4.2.1 (C) 2000-2007 MPlayer Team which doesn't know the "i_certify_that_my_video_stream_does_not_use_b_frames" option. probably i should go and read the manual... mfg.asdr IOhannes