Field Dominance of Interlaced MPEG files?

[Pied-Piper]

Can anyone help me on how to determine the field order of interlaced MPEG files? and another topic that always bothered me to find a detailed explanation is HOW TVs display progressive Videos like VCDs(that don't have two fields due to standard VCD resolution).
Any help and explanation is greatly appreciated.
I read here: "mpeg1 does not support interlacing" what does it mean? I know the video can be interlaced or progressive and there is not any other type of video. So if MPEG1 doesn't support interlacing, what is the type of high res MPEG1 files that interlacing artifacts are visible in them. In other words when capturing from VCR to MPEG1 at high vertical resolution like 480 or 576 what exactly happens?
I say this because there is a defined number of horizontal scan lines in every analog video signal which make two fields of the video for an interlaced display like TV. These images are made up of approximately 576 visible lines. and when I capture these video signals in full resolution(480or576vertical)MPEG1or2>interlacing artifacts are visible when I view the video on a progressive display and this does not depend on the compression method (MPEG1 or MPEG2) so I wonder how MPEG1 doesn't support interlacing. Or am I misinformed and this means that progressive MPEG1 files can't be converted to interlaced?!
What is the field order of MPEG file that is captured from analog VCR source? and why? does it depend on the capture card?

[Poplar]

1. Bitrate Viewer can give you info about field order of a Mpeg-2 stream.

2. I don't know whether Mpeg-1 supports interlacing. Standard VCD (Mpeg-1, 352X240(288)) doesn't. XVCDs are outside this standard.

3. From what I heard, most capture cards capture one field at one time, then weave two fields together to form a frame, if you capture about xxx X 240(288), which means you get an interlaced frame.

4. Why do you need to convert progressive frame to interlaced frame? Your DVD player does it for. Your TV expects 60 fields persond and your DVD player feeds it, no matter your source is progressive or interlaced. If you have a progressive scan DVD player and a progressive scan TV, that's another matter.

5. Field order of analog capture indeed depends on capture cards. Often times, they can get it wrong. You need to swap fields to correct it.