My problem is I'm writing a script to automatically (hands off) convert Real Media rm videos to flv videos. The command line I've worked out seems solid for almost all of our source files, but a few have somehow been originally encoded with the video starting about 5 seconds after the audio. My biggest confusion is that mplayer is able to correct for this after about 8 seconds if I use the -mc flag: mplayer -mc .1 rtsp://ice.walkerart.org:8080/translocations/media/Jamie.rm (that's an example I'm working with, please give it a try) But mencoder never regains sync: mencoder rtsp://ice.walkerart.org:8080/translocations/media/Jamie.rm -ni -o output.flv -oac mp3lame -lameopts abr:br=56 -srate 22050 -ovc lavc -lavcopts vcodec=flv:vbitrate=300:mbd=2:mv0:trell:v4mv:cbp:last_pred=3 -fps 15 -ofps 15 -mc 1 -of lavf -lavfopts i_certify_that_my_video_stream_does_not_use_b_frames -ss 00:00:00 -endpos 00:04:12 The mplayer -identify info is below: MPlayer 2:1.0~rc1-0ubuntu13 (C) 2000-2006 MPlayer Team CPU: Dual-Core AMD Opteron(tm) Processor 2218 (Family: 15, Model: 65, Stepping: 2) CPUflags: MMX: 1 MMX2: 1 3DNow: 1 3DNow2: 1 SSE: 1 SSE2: 1 Compiled with runtime CPU detection. . . . VIDEO: [RV30] 320x240 24bpp 15.000 fps 0.0 kbps ( 0.0 kbyte/s) Clip info: name: Jamie ID_CLIP_INFO_NAME0=name ID_CLIP_INFO_VALUE0=Jamie author: Walker Art Center ID_CLIP_INFO_NAME1=author ID_CLIP_INFO_VALUE1=Walker Art Center copyright: �2003 ID_CLIP_INFO_NAME2=copyright ID_CLIP_INFO_VALUE2=�2003 ID_CLIP_INFO_N=3 ID_FILENAME=Jamie.rm ID_DEMUXER=real ID_VIDEO_FORMAT=RV30 ID_VIDEO_BITRATE=0 ID_VIDEO_WIDTH=320 ID_VIDEO_HEIGHT=240 ID_VIDEO_FPS=15.000 ID_VIDEO_ASPECT=0.0000 ID_AUDIO_FORMAT=sipr ID_AUDIO_BITRATE=0 ID_AUDIO_RATE=8000 ID_AUDIO_NCH=1 ID_LENGTH=252.00 Is there any way I can detect the video delay from a script and correct it that way? (although using -delay 5 -mc 0 causes me to lose the first 5 seconds of audio) Why can mplayer regain sync but mencoder can't? Thanks for any tips! I've been working on this for two days and just can't find a way... Nate