Converting flv for ipod nano 3d

I've converted flv using the ipod nano preset, but ipod nano 3d(model xB249) refuses to play the resulted video.

Start by reproducing conversion of the reported FLV with the iPod nano preset and compare the resulting video with the playback requirements of the iPod nano 3d model xB249. The issue mentions no source files or tests; done would mean identifying a reproducible cause and producing output that the device plays.

Written by the indexing model from the issue text.