mario@circo3d-md:~/Escritorio/Camera$ mencoder VID_20120104_152114.3gp -o vid.avi -oac pcm -ovc xvid
MPlayer 1.3SVN-r37931 (C) 2000-2017 MPlayer Team
success: format: 0  data: 0x0 - 0x4c92f4
libavformat version 57.71.100 (internal)
libavformat file format detected.
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x55784906a0e0]Protocol name not provided, cannot determine if input is local or a network protocol, buffers and access patterns cannot be configured optimally without knowing the protocol
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x55784906a0e0]Could not find codec parameters for stream 1 (Video: mpeg4 (mp4v / 0x7634706D), none, 495 kb/s): unspecified size
Consider increasing the value for the 'analyzeduration' and 'probesize' options
[lavf] stream 0: audio (aac), -aid 0, -alang eng
[lavf] stream 1: video (mpeg4), -vid 0
VIDEO:  [MP4V]  0x0  24bpp  90000.000 fps  495.7 kbps (60.5 kbyte/s)
[V] filefmt:44  fourcc:0x5634504D  size:0x0  fps:90000.000  ftime:=0.0000
==========================================================================
Opening audio decoder: [ffmpeg] FFmpeg/libavcodec audio decoders
libavcodec version 57.89.100 (internal)
AUDIO: 48000 Hz, 2 ch, floatle, 156.0 kbit/5.08% (ratio: 19501->384000)
Selected audio codec: [ffaac] afm: ffmpeg (FFmpeg AAC (MPEG-2/MPEG-4 Audio))
==========================================================================
xvid: using library version 1.3.4 (build xvid-1.3.4)
Opening video filter: [expand osd=1]
Expand: -1 x -1, -1 ; -1, osd: 1, aspect: 0.000000, round: 1
==========================================================================
Opening video decoder: [ffmpeg] FFmpeg's libavcodec codec family
Selected video codec: [ffodivx] vfm: ffmpeg (FFmpeg MPEG-4)
==========================================================================
Possibly bad interleaving detected.
Use -ni option if this causes playback issues and avoid or fix the program that created the file.
Movie-Aspect is undefined - no prescaling applied.
videocodec: XviD (320x240 fourcc=44495658 [XVID])
xvid: par=0/0 (vga11), displayed=320x240, sampled=320x240
xvid: you must specify one or a valid combination of 'bitrate', 'pass', 'fixed_quant' settings
FATAL: Cannot initialize video driver.
Movie-Aspect is 1.33:1 - prescaling to correct movie aspect.
videocodec: XviD (320x240 fourcc=44495658 [XVID])
xvid: par=0/0 (vga11), displayed=320x240, sampled=320x240
xvid: you must specify one or a valid combination of 'bitrate', 'pass', 'fixed_quant' settings
FATAL: Cannot initialize video driver.

Exiting...
mario@circo3d-md:~/Escritorio/Camera$