Determining field order

[dadrab]

I read in another thread that one can determine field order by stepping through a video with VirtualDubMod. Can someone explain that process to me, please.

Currently, I just guess at it as most AVIs are encoded TFF, but I've been bitten a few times too. The encoders I use (MainConcept and TMPGE) default to BFF.

Rather confusing.

Thanks in advance.

[45tripp]

Install avisynth if you haven't already (you'll find many uses for it along the way)

open a text file with notepad in the directory you have your file in,
and write the following:

Avisource("filename.avi")
Assumetff().SeparateFields()

save the file with an .avs extension, like so "video.avs"

open the .avs file in vdub,
move to some motion,
step through it one frame (field) at a time,
if motion happens progressively, its top field first,
if you have motion jumping back then foward, it's bottom field first.

Avi has nothing to do with it.
Most DV is bff,
most of anything else is tff.

If you need to check mpeg2 field dominance,
the prefered way to load your material into avisynth is with DGMPGDec

gl

[dadrab]

I sure appreciate the quick response. I'll follow your lead.