Are you referring to field based encoding of interlaced sources? The only encoder which supports this AFAIK is Procoder / Carbon Coder. This option complies with the MPEG2 specs, but not with the DVD specs, so I never used it.
From the ECLPro readme for DVD Rebuilder:
Quote:
|
Alsaysframe = 0:Use field base encoding for interlaced sources (better) - 1(default):Always use frame mode (more compatible) - Please use frame mode in DVD-RB else you get errors in rebuilding.
|
So I do not have an answer to your question how you can determine which mode was used during encoding.