Mpeg2(ff) and interlace

[max.db]

My source file is a DV AVI bottom field first captured using my MiniDV camcorder from the A/V output of a VHS VCR.  I'm configuring the Mpeg2(ff) libavcodec setting for Interlaced, Bottom field first.  But the rendered mpg file identifies the video stream as Progressive in Media Info.  I import it into a Sony VMS project which is a progressive bottom first project.  It also identifies the source media as Progressive.  So I override it to interlaced bottom field first.  Am I doing the right thing?

Is there a bug in Avidemux sending the wrong info to the codec (ignoring my interlaced bottom first setting)?  Or a bug in the codec ignoring this setting sent from Avidemux?  Or a bug in the codec identifying the resulting stream as progressive when it's really Interlaced?

Thanks,
Chris
(max.db)

[AQUAR]

Probably better to use the frame based version of Avidemux (2.5.6).

A normal progressive frame can be presented by two interlaced fields.
In that case the fields hold picture information components from the same instant in time.
And the progressive frame is simply recovered by weaving these fields.

So yes, interlaced media can hold progressive film.

With the source device being a VHS VCR, that is probably not the case.
So maybe its the way the capture is processing that kind of video (field 2 frame!).