OT: extracting codec info from an mpeg video file

[Nigel Ridley]

Sorry for the OT questions.
I have managed to find on the web a short video clip with a .mpg file extension which plays on an 
Artech Portable DVD Player :-) I now would like to be able to find out how the said file is built 
ie. what do I have to do to replicate its make-up.
Any cmd line suggestions? I did look through the man pages for ffmpeg but no joy and I also 
scoured the web but again no joy :-(

TIA

Blessings,

Nigel