Attached is my attempts so far at documenting NUT in English as opposed to Lingua Dei Codicis. :) I'm told that, given good documentation on NUT, Måns is possibly willing to update the lavf implementation. The intent of this document is not to replace the formal spec that already exists, but rather for it to be developed into the "informative" (as opposed to normative) parts of the spec, particularly what one might call a "Usage" section. Rationale and Examples might be other non-normative sections we should consider writing. So far my writing has been somewhat disorganized. I think it could make a much better presentation if it used more itemized lists, tables, etc. Actually I'd be very happy if other people want to work on improving this; what I've set out is just the groundwork I think. Comments? Revisions? Frames? (Pardon my Engrish. :) Ideas for merging this into a nice specification document? Rich