I've looked at the file and so far it's about what I suspected. It would seem that the reason you get two images is because it is supposed to be interlaced. Now the reason you see it as two fields together rather than alternating fields like you expect interlacing to be like, is because the video is encoded as progressive, presumably because interlaced encoding is very wasteful. So I expect the hardware takes the first 144 lines and displays them on odd fields, and the next 144 lines on the even fields, in effect it splits the image into two and displays it in such a way that it is now properly interlaced.
I'm just poking around with the stuff I have on my laptop at the moment. So far I trying to load the .sfd with directshowsource in AVISynth causes it to crash the player, but you can of course load the .sfd into DGIndex, and treat it like a .vob to get a d2v, and load it via MPEG2Source. You can also demux the video while you are there if for whatever reason you wanted to re-mux it to MPG or MP4.
In fact it seems it is just standard MPEG-2, I loaded the demuxed MPEG video into a hex editor and the header looks fine (
check out this thread where I explained hex editing MPEG-2). The header in this file is
00 00 01 B3
20 01 20 24
This tells me that the vertical resolution is
512, the horizontal resolution is
288, the aspect ratio is
4:3, and the framerate is
29.97, however DGIndex detected the framerate as 23.976.
What might work would be cropping the video into two halves and interlacing them. If the video is how I hope it is, then you could use whatever required to IVTC (just like with a DVD to make 29.97 > 23.976) meaning that progressive frames would be reconstructed, however the possibility is high that it's a pure interlaced video, in which case you won't rescue much of anything and would maybe be just as well off cropping and using one of the fields.
Unfortunately I cannot for the life of me remember the function to interlace sources, and searching didn't return anything useful because everyone wants to remove interlacing.
I was not able to get the .adx files playing.