#19 error while converting into flv

[Anonymous]

Im getting this error while converting from wmv to flv format?
can u suggest me the solution plz
thanx in advance

Output #0, flv, to '/home/divine/co_newtravel/videos/converted/4.flv':
Stream #0.0: Video: flv, 320x240, 1.00 fps, q=2-31, 200 kb/s
Stream mapping:
Stream #0.1 -> #0.0
Unsupported codec (id=0) for input stream #0.1