avconv version 0.8.6-6:0.8.6-0ubuntu0.12.10.1, Copyright (c) 2000-2013 the Libav developers
  built on Apr  2 2013 17:07:34 with gcc 4.7.2
[flv @ 0x8b31720] Estimating duration from bitrate, this may be inaccurate
Input #0, flv, from 'Madagaskar 3  Dubbing PL.flv':
  Metadata:
    metadatacreator : Yet Another Metadata Injector for FLV - Version 1.8
    hasKeyframes    : true
    hasVideo        : true
    hasAudio        : true
    hasMetadata     : true
    canSeekToEnd    : true
    datasize        : 752574199
    videosize       : 612943142
    audiosize       : 138042801
    lasttimestamp   : 5604
    lastkeyframetimestamp: 5604
    lastkeyframelocation: 752602656
  Duration: 01:33:24.09, start: 0.042000, bitrate: 1065 kb/s
    Stream #0.0: Video: h264 (High), yuv420p, 852x480 [PAR 640:639 DAR 16:9], 872 kb/s, 23.98 tbr, 1k tbn, 47.95 tbc
    Stream #0.1: Audio: aac, 48000 Hz, 5.1, s16, 192 kb/s
File 'testing/output.avi' already exists. Overwrite ? [y/N] y
[buffer @ 0x8b35120] w:852 h:480 pixfmt:yuv420p
[mpeg4 @ 0x8b343e0] Invalid pixel aspect ratio 640/639, limit is 255/255
Output #0, avi, to 'testing/output.avi':
  Metadata:
    metadatacreator : Yet Another Metadata Injector for FLV - Version 1.8
    hasKeyframes    : true
    hasVideo        : true
    hasAudio        : true
    hasMetadata     : true
    canSeekToEnd    : true
    datasize        : 752574199
    videosize       : 612943142
    audiosize       : 138042801
    lasttimestamp   : 5604
    lastkeyframetimestamp: 5604
    lastkeyframelocation: 752602656
    Stream #0.0: Video: mpeg4, yuv420p, 852x480 [PAR 640:639 DAR 16:9], q=2-31, 200 kb/s, 90k tbn, 23.98 tbc
    Stream #0.1: Audio: [0][0][0][0] / 0x0000, 48000 Hz, 5.1, s16, 200 kb/s
Stream mapping:
  Stream #0:0 -> #0:0 (h264 -> mpeg4)
  Stream #0:1 -> #0:1 (aac -> libmp3lame)
Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height