Is it Possible to Add Scanline on a CRT Monitor

RetroArch General
#1

Hello everyone

I use Retroarch with CRT Switch on a Sony KV29-CS60B. This TV is a 100HZ, so I have a scanlines problem with vertical resolutions (224 for example)

So I created several “scanline” files that I send with retroarch overlays to do tests.

I created a picture of 224x224 a line of 2 in black => scanlines visible but far too thick

I created an image of 448x448 a line of 2 in black => to my surprise I do not see the scanlines, I think this is the TV that does not handle the 240p well and upscale at 480i or 480p.

I had an idea since it’s a TV 100HZ, I told myself why not use the option “Black Frame Insertion” and my scanlines have appeared, I have a great picture but the speed of play is divided by two.

I try to divide my refresh rate in the config of Retroarch, it works I can use the option “Black Frame Insertion” with a normal game speed but the scanlines are no longer visible

Is there a way to “force” scanlines on TV CRT other than CRT PVM / BVM

I leave some pictures if it can help

Thank you, and sorry for my bad English

I hope you’ll understand what I’m trying to say

Without BlackFrame Insertion ( overlay scanline active )

IMG_20180819_190417%5B1%5D
IMG_20180819_190417[1].jpg3264×2448 2.07 MB

Witch BlackFrame Insertion Active

IMG_20180819_190711%5B1%5D
IMG_20180819_190711[1].jpg3264×2448 1.75 MB

CRT TV 100Hz Scanlines and 240p games
#2

The scanlines should show with BFI even without an overlay, since each individual frame should have scanlines, it’s just alternating back and forth which lines are visible.

I don’t know of any way to keep full speed but still show 240p-style scanlines on a 480i signal.

#3

Sorry, but what is BFI ?

#4

black frame insertion

#5

Maybe it’s the 100HZ problem

I give a try with Flicker shader (cg shader to have parameter) and scanlines appears when I decrease the flicker value about 0.60 and below