redfox: You mean the current option as described in my changelog does not work on your side?
DScaler is mainly a tool for interlaced sources, so progressive support was broken on various places in the code. DScaler always defaulted to interlaced.
Now since progressive is working again, the question was to what should DScaler default on startup?
Luckily DShow sources tell it and for the natively supported cards are all interlaced sources (BT878, Philips).
So quoting myself from the first post:
DirectShow Sources that do not give information if they are interlaced or not can now set manually to Frame or Field mode (go to to DShow/Filter Properties/Open the branch of DScaler video renderer/Input/Force Field/Frame Input). When changing to Field mode the Deinterlace mode will also switch from Progressive to the last set Deinterlace mode.
So if your DSHow source reports nothing or wrongly, you can change/overwrite it there.
Field mode -> interlaced, deinterlace filter list available
Frame mode -> progressive, progressive filter list available, which is currently just one entry "progressive"
In the screenshot in https://www.vogons.org/viewtopic.php?f= ... 27#p775170 you can see that the Epiphan VGA2PCI defaults correctly to progressive. And you can see the other branch in the DShow filters with DScalers input filter. If you select that the dialog with the frame/field selection comes up.
Is that what you are looking for?