sky@sky-desktop ~ $ ffmpeg -i ~/Desktop/142306432_l.mov -vcodec mpeg4 -vb 3000k -strict experimental -acodec aac -ab 256k -cutoff 15000 ~/Desktop/test.3gp
ffmpeg version 0.8.6-4:0.8.6-0ubuntu0.12.04.1, Copyright (c) 2000-2013 the Libav developers
  built on Apr  2 2013 17:00:59 with gcc 4.6.3
*** THIS PROGRAM IS DEPRECATED ***
This program is only provided for compatibility and will be removed in a future release. Please use avconv instead.

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
Incompatible pixel format 'yuvj420p' for codec 'mpeg4', auto-selecting format 'yuv420p'
[buffer @ 0x81ed220] w:480 h:360 pixfmt:yuvj420p
[avsink @ 0x81e16a0] auto-inserting filter 'auto-inserted scaler 0' between the filter 'src' and the filter 'out'
[scale @ 0x81e1a20] w:480 h:360 fmt:yuvj420p -> w:480 h:360 fmt:yuv420p flags:0x4
Output #0, 3gp, to '/home/sky/Desktop/test.3gp':
  Metadata:
    major_brand     : qt
    minor_version   : 537199360
    compatible_brands: qt
    creation_time   : 2012-03-30 19:14:39
    encoder         : Lavf53.21.1
    Stream #0.0(eng): Video: mpeg4, yuv420p, 480x360 [PAR 1:1 DAR 4:3], q=2-31, 3000 kb/s, 30 tbn, 30 tbc
    Metadata:
      creation_time   : 2012-03-30 19:14:39
    Stream #0.1(eng): Audio: aac, 22050 Hz, stereo, s16, 256 kb/s
    Metadata:
      creation_time   : 2012-03-30 19:14:39
Stream mapping:
  Stream #0.0 -> #0.0
  Stream #0.1 -> #0.1
Press ctrl-c to stop encoding
Multiple frames in a packet from stream 1
frame=  846 fps= 67 q=2.0 size=   10183kB time=28.20 bitrate=2958.0kbits/s