[FFmpeg-user] Avid mxf to mpeg? (new user)

[Alan Trimble]

I am attempting to convert a native Avid .mxf file to mpeg2 or some
other readable/viewable format in OSX. The original video is 1920x1080
PAL - 50hz... 1080i format.

Trying:
./ffmpeg -f dnxhd -i ./America.mxf -target mpeg2video test.mpeg

Results in:
[dnxhd @ 0x100817400] Could not find codec parameters for stream 0 
(Video: dnxhd): unspecified size
Consider increasing the value for the 'analyzeduration' and 'probesize' 
options
./America.mxf: could not find codec parameters

I haven't found any obvious flags for directly specifying the 
resolution/size
in the documentation. Thanks in advance for advice!
-AT