Currently I'm working on a Superman II Donner fan edit. After backing up my PAL copy of S2 TRDC on my hard drive I converted the VOB files to an "interlaced mpeg2 movie file" using TMPGEnc. I selected "top field first", even though the source type is "progressive", (which I always understood to not require a field order placing).
I’ve been editing it over the last week in Ulead Video Studio. I’m breaking it up into sections so not to be too taxing on my computer. However when I export my edit the picture at times gets a little scrambled, resulting in tiny pauses. Mostly evident in fast motion scenes. It's difficult to explain without knowing the correct terminology, but the pixels just appear shifted at times.
I found this problem to be easily corrected by changing the field order in the project settings to "frame based" or "lower field first".
This has confused me due to the following:
- Firstly the file was encoded as "top field first", so how could rearranging it during the editing stage help?
- Secondly I thought computers tend to not show incorrect field order placing, that this can only be seen on a TV monitor.
- Finally, in the past when I’ve encoded files with the incorrect field order, the resulting effect has been jumpy picture, not this scrambled picture.
Any information with regards to this would be much appreciated.