Seems stream 0 codec frame rate differs from container frame rate: 600.00 (600/1) -> 30.00 (30/1)
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/home/sky/Desktop/142306432_l.mov':
  Metadata:
    major_brand     : qt
    minor_version   : 537199360
    compatible_brands: qt
    creation_time   : 2012-03-30 19:14:39
  Duration: 00:00:41.20, start: 0.000000, bitrate: 1357 kb/s
    Stream #0.0(eng): Video: svq3, yuvj420p, 480x360, 1168 kb/s, PAR 1:1 DAR 4:3, 29.97 fps, 30 tbr, 600 tbn, 600 tbc
    Metadata:
      creation_time   : 2012-03-30 19:14:39
    Stream #0.1(eng): Audio: adpcm_ima_qt, 22050 Hz, stereo, s16, 176 kb/s
    Metadata:
      creation_time   : 2012-03-30 19:14:39
At least one output file must be specified
sky@sky-desktop ~ $