Big thanks to GS1966 and the Russian Vegas community. This did not originate in my head. Just that the idea is kind of lost in another thread and even there a lot gets lost in the translation. I should also thank John Meyer, several things he said and the technique he described using AVISyth got me thinking further and persisting with what was said in Russian.
1) Create progressive project at double the frame rate of the video you wish to check. That means 50fps for PAL, 60fps for NTSC. Set field order to None. Set de-interlace method to Interpolate. Pixel Aspect Ratio etc isn't critical but better to match that to source media, just to make seeing what's going on easier. Make Preview Best / Full.
2) Add interlace media to timeline. Single frame step through part of the video that has fast motion. You should see objects continue to move in the same direction between frames. If they go backward / forwards / backwards you have a field order problem. You may need to look carefully, typically you'll see a big change in position followed by a small change in position in the opposite direction.
3) To check further RClick the source media on the timeline and change the field order to the opposte value. If the motion is now all in the same obvious direction you have now made the field order correct for that source media.
Hope this helps someone. I usually check everything with a CRT monitor of some form but not everyone has these available.
Bob.
1) Create progressive project at double the frame rate of the video you wish to check. That means 50fps for PAL, 60fps for NTSC. Set field order to None. Set de-interlace method to Interpolate. Pixel Aspect Ratio etc isn't critical but better to match that to source media, just to make seeing what's going on easier. Make Preview Best / Full.
2) Add interlace media to timeline. Single frame step through part of the video that has fast motion. You should see objects continue to move in the same direction between frames. If they go backward / forwards / backwards you have a field order problem. You may need to look carefully, typically you'll see a big change in position followed by a small change in position in the opposite direction.
3) To check further RClick the source media on the timeline and change the field order to the opposte value. If the motion is now all in the same obvious direction you have now made the field order correct for that source media.
Hope this helps someone. I usually check everything with a CRT monitor of some form but not everyone has these available.
Bob.