Reply To: Confused about how OSSC works with PS2


OK, thanks for the explanations. I did eventually find what I was really looking for which is this post

Speaking purely as a guy who cleans and converts VHS to digital for a living, I’d personally just use the passthrough mode with the majority of PS2 games. The reason the 2X, 3X and 4X modes look so good on Sega Mega Drive, SNES and N64 is because the majority of the games output at 240p or 288p. Because the signals are progressive, that means the OSSC has all the lines that make up the frame right from the word go. The PS2 on the other hand primarily outputs at 480i or 576i – interlaced video signals. What that means is the console alternates between showing the odd and even numbered lines that make up the frame separately. In progressive video, 30 frames per second is just that. But in interlaced, 30 frames per second is actually 60 half-frames per second. Not half as in chopped in half, but half the lines that make up the frame. That means with 480i or 576i content, at any given time the OSSC only has half the image to work with. Linedoubling such content means half the vertical resolution is lost.

For that reason, I would NEVER linedouble an interlaced signal unless it was a re-release of an old 288p game that was converted to 576i. The PS2 has a few games like that, such as the Sonic the Hedgehog collections. Deinterlacing such games in the normal field combination method generally results in combing artifacts where there shouldn’t be any, whereas linedoubling 288p games that were converted to 576i surprisingly retains the original visual intention. But for the vast majority of games that were rendered at 576i to begin with, you’re better off letting your TV or some other device do the deinterlacing. Even a cheap scaler will produce a more accurate deinterlace of such content than the OSSC or RetroTINK.

I have found the OSSC to be very confusing (but interesting). By the sound of it I am not alone …

“Also, most users are not trained in video production; this often causes poor results as many people do not know much about deinterlacing and are unaware that the frame rate is half the field rate.” – Wikipedia Page on Deinterlacing.

This is also what I failed to appreciate on the product page

“The OSSCs deinterlacer is lag free! Note that this does however mean there’s a drop in picture quality for interlace sources, but this is unavoidable.”

So, unless I keep it for the 240p games, do I basically have a glorified pass through (but the scanlines are cool) for my PS2 ? Are there better alternative products for PAL 576i and NTSC 480i PS2 gaming that will deinterlace and upscale things better than my TV will do without losing drop shadows and sprite effects ? I already know about the Framemeister but that is discontinued and very expensive on ebay (I was seeing them going for $750).