Input #0, asf, from 'Cars (2006).wmv':
  Metadata:
    WMFSDKVersion   : 12.0.7601.17514
    WMFSDKNeeded    : 0.0.0.0000
    IsVBR           : 0
  Duration: 01:56:31.44, start: 0.000000, bitrate: 4503 kb/s
    Stream #0.0(eng): Audio: wmapro, 44100 Hz, 5.1, flt, 384 kb/s
    Stream #0.1(eng): Video: wmv3 (Main), yuv420p, 1280x544, 6000 kb/s, 1k tbr, 1k tbn, 1k tbc

$ avconv -i /tmp/tmp.8yMq54tOdS.wav -map 0:0 -i "Cars (2006).wmv" -map 1:0 -vf "scale=480:trunc(ow/a/2)*2" -vcodec mjpeg -an -b 1800k -r 15 -qscale 10 -c:a:0 copy Cars.avi 

avconv version 0.8.3-4:0.8.3-0ubuntu0.12.04.1, Copyright (c) 2000-2012 the Libav developers
  built on Jun 12 2012 16:52:09 with gcc 4.6.3
[wav @ 0x1a539c0] max_analyze_duration reached
Input #0, wav, from '/tmp/tmp.8yMq54tOdS.wav':
  Duration: 01:56:31.20, bitrate: 705 kb/s
    Stream #0.0: Audio: pcm_f32le, 22050 Hz, 1 channels, flt, 705 kb/s
[wmv3 @ 0x1a542c0] Extra data: 8 bits left, value: 0
[asf @ 0x1abfc80] max_analyze_duration reached
Input #1, asf, from 'Cars (2006).wmv':
  Metadata:
    WMFSDKVersion   : 12.0.7601.17514
    WMFSDKNeeded    : 0.0.0.0000
    IsVBR           : 0
  Duration: 01:56:31.44, start: 0.000000, bitrate: 4503 kb/s
    Stream #1.0(eng): Audio: wmapro, 44100 Hz, 5.1, flt, 384 kb/s
    Stream #1.1(eng): Video: wmv3 (Main), yuv420p, 1280x544, 6000 kb/s, 1k tbr, 1k tbn, 1k tbc