MythExport Problems

Output #0, ipod, to '/media_library/MythTV/mythExport/BBC-One-HD-Formula_1-The_Monaco_Grand_Prix-20120527120500.m4v':
    Stream #0.0: Video: mpeg4, yuv420p, 800x480 [PAR 16:15 DAR 16:9], q=2-31, 200 kb/s, 90k tbn, 50 tbc
    Stream #0.1(NAR): Audio: libfaac, 48000 Hz, stereo, s16, 200 kb/s
Stream mapping:
  Stream #0.0 -> #0.0
  Stream #0.1 -> #0.1
Error while opening encoder for output stream #0.0 - maybe incorrect parameters such as bit_rate, rate, width or height
rm: cannot remove `*.log': No such file or directory
rm: cannot remove `*.mbtree': No such file or directory
May 28 17:59:43 ZUBUNTU /usr/bin/mythexport-daemon[17856]: query = delete from mythexport_job_queue where id=? at line 517 in /usr/bin/mythexport-daemon