I really dont want to explain the screen choice, its just a video card i need advice on....
You have zero idea on my hardware setup. if you knew even a small part of it you would know why your suggestion of 19-23" screens second hand or not isnt required at all.
There really is a reason why Im doing what Im doing.

Is it just a screen panel or is it screen with a controller attached to it with composhit input ? If it is the latter then you can be guaranteed it samples the input 720 times a line (as per REC601 spec), and scales it to fit the horizontal resolution of the panel itself and same in vertical direction although you may be lucky and it crops instead of fits, leading slightly higher definition at cost of missing lines in top and/or bottom. You cannot rely on any sort of pixel precision with such screens, but luckily majority of composhit producing devices also produce 720pixel output so at least ADC on the controller will be happy, and then the question becomes how are you gonna be aligning scaler on generation and display end for least blurry result.

With two VGA outputs there's a way to get 6x outputs with some additional hardware, albeit monochrome only. You can treat each of the RGB channels as a separate luma channel and with a simple circuit to embed sync into each you can get 6x outputs with whatever timings you want assuming the card is supported by things like PowerStrip or Modelines type stuff. You do want to create exactly REC601 based timings to align with ADC on the screen end and then you only have to fight the screen scaler.

Monochrome wouldnt be a problem for me. Its such a basic "image" i intend to display monochrome might be an advantage.

The whole splitting signals seems over the top for me... These things are supposed to take a composite input and display the image.
I just dont know how to get 4 or 8 composite outputs from one computer.
I mean I could get 2 NVS 510 graphics cards that would give 4+4 DisplayPort outputs but how do I convert DP to Composite?
Or I have a 750Ti that has DVI, x2 HDMI and DP but how to I get that to do it... And for that matter if I was to do that then it means I can convert DVI to composite in which case I would rather use the NVS 420 I have...

You guys are seem to be thinking how bad these monitors are going to be but what I want to display is so basic it wont matter... Its just black lines on a white screen. Red dots, green dots and some text.

I really dont need any help with the screens... Just the outputs.

Video wall controller 2x2 or 4x2
4x or 8x hdmi to rca converter

seems like a possibility.

That will do for me.
Do you happen to know what video wall controller can output 4/8 different composite video feeds?

Ive never used a video wall, but I was under the impression they take one input and split it up over several outputs

Yes, it's one input split over several outputs.

a quick ebay search for old ones that give multiple composite output feeds didn't reveal any candidates.

I need to output 8 different pictures to each monitor. Not the same one 8 times. Or the same picture spread over 8 monitors.
For instance I would like to display 8 different web pages... Imagine a normal PC setup with a 4 head graphics card. Each monitor will display its own distinctly different picture. and then times that by 2...
Or an 8 head graphics card with each monitor on its own output displaying a completely different picture to the others.

A video wall has the right amount of heads but I dont think it will be able to do what I want to do.

I already have a card similar to this but mine is a 1x PCIe connector.
https://www.ebay.co.uk/itm/204520312491?hash= … bEAAOSwoQFlPlgi
With the 4 way DVI adapter.
But I dont know how to make that put out a composite video signal

sigh

https://www.amazon.com/iseevy-Channel-Control … g/dp/B07C89ZHT6

Takes in 1 HDMI or DVI or VGA input
and divides that single input over 9 monitors/screens/displays.

You can open 9 VLC players each playing a different video and place them on your desktop in a 3x3 pattern and then each of the 9 monitors behind the controller displays one VLC player.

then you take the hdmi outputs of the controller and run each through an HDMI 2 AV adapter, et voila, your outputs are composite.

I already have a matrix switcher that can do that and more.
Why would I need to buy another one that is less capable than what I already have and doesnt do with I need it to?

The interesting part of your post is this...

weedeewee wrote on 2023-12-26, 18:32:

and run each through an HDMI 2 AV adapter, et voila, your outputs are composite.

Can you elaborate on what exactly that HDMI 2 AV adapter is?

I could but it's easier if you just google it because I'm getting a headache.

Ok that all seems ok.
Do you know if there is a version of that device that takes in DisplayPort instead of HDMI? Or maybe that takes in DVI instead of HDMI? VGA instead of HDMI?

yes

weedeewee wrote on 2023-12-26, 20:23:

yes

Can you tell me where I can get them from please, as I can only seem to find the HDMI version.

ElectroSoldier wrote on 2023-12-26, 04:23:

You have zero idea on my hardware setup

hence I asked, and you keep dodging

ElectroSoldier wrote on 2023-12-26, 04:23:

if you knew even a small part of

exactly! if only you explained

ElectroSoldier wrote on 2023-12-26, 04:23:

There really is a reason why Im doing what Im doing.

"and its secret so Im not gonna tell you" 😀 This leaves me guessing, and my best guess is you saw those cheap crappy Chinese TVs with spec sheet full of lies and got ideas 😀

ElectroSoldier wrote on 2023-12-26, 04:23:

You guys are seem to be thinking how bad these monitors are going to be but what I want to display is so basic it wont matter... Its just black lines on a white screen. Red dots, green dots and some text.

Doesnt matter what you want to display, and its not about quality of the screens. Even if all you want is bright squares Composite LCDs make no sense exactly because of the input method. It doesnt matter that you found some (maybe even local, supermarket clearance etc) source of cheap panels when connecting them is hard precisely because of ancient Composite input.

ElectroSoldier wrote on 2023-12-26, 04:23:

I really dont want to explain the screen choice, its just a video card i need advice on....
I really dont need any help with the screens... Just the outputs.

Thats because you dont know how Composite signal works 🙁.
No, whatever you are looking at doesnt do 1440 x 234, it doesnt even do clean 480 x 234 due to digital to analog and another analog to digital conversions. The mere fact Chinese manufacturer decided to lie in the specification strongly suggests slightly blurry ~320x200 output.
No, there arent any cards with multiple composite outputs.
No, there arent any obtainable video wall processors with composite outputs. Video walls went from extremely expensive niche (Sony jumbotrons) to just expensive executive room/tv studio solutions from Matrox (dualhead/trippehead/quadhead reusing VGA/HDMI/DP screens) or Cyviz (https://www.quantelectronic.de/en/56942.html).
No, composite is not easy to convert like HDMI to DVI with passive converters, or HDMI to DP with small chip embedded in the cable. It requires a whole video processor.

weedeewee wrote on 2023-12-26, 17:52:

a quick ebay search for old ones that give multiple composite output feeds didn't reveal any candidates.

Because that was never a thing. I know of only Matrox dedicated CRT video wall solution, and afair even that worked with external box in tandem with video card. Matrox quickly pivoted to much more mass marketable VGA/hdmi/dp products https://www.techpowerup.com/review/matrox-tri … o-analog/3.html (~$20 on ebay now) https://www.wsgf.org/article/matrox-triplehea … -edition-review

ElectroSoldier wrote on 2023-12-26, 18:51:

weedeewee wrote on 2023-12-26, 18:32:

https://www.amazon.com/iseevy-Channel-Control … g/dp/B07C89ZHT6
Takes in 1 HDMI or DVI or VGA input
and divides that single input over 9 monitors/screens/displays.

I already have a matrix switcher that can do that and more.

No you dont, if you had one you would be making this thread 😀. Its not a switcher, its a dedicated video wall processor "splicing mode with 9 HDMI outputs 3x3, 2x4, 4x2, 2x3, 3x2, 2x2".

This thread has devolved to "how to google HDMI to Composite converter" 🙁
https://www.ebay.com/itm/385533385953 'hdmi to rca'
https://www.ebay.com/itm/403288439269 'dp to hdmi'
High chance of not working together due to being dodgy cheap products. Very high chance of low fidelity of resulting analog output.

By the way, I don't think there's such a thing as a native composite panel. All the DVD and car headrest screens I have got inside of have a chip that does the composite video or also component to RGB analog conversion, so there's an RGB analog feed into whatever crappy flash convertors they could get cheap to feed the RGB 5:5:5 digital part, or it's serialised for LVDS in very much more modern stuff.

Anyway, what I'm saying is break out the analog RGB input then connect to multihead VGA.

rasz_pl wrote on 2023-12-26, 22:48:

hence I asked, and you keep dodging […]
Show full quote

ElectroSoldier wrote on 2023-12-26, 04:23:

You have zero idea on my hardware setup

hence I asked, and you keep dodging

ElectroSoldier wrote on 2023-12-26, 04:23:

if you knew even a small part of

exactly! if only you explained

ElectroSoldier wrote on 2023-12-26, 04:23:

There really is a reason why Im doing what Im doing.

"and its secret so Im not gonna tell you" 😀 This leaves me guessing, and my best guess is you saw those cheap crappy Chinese TVs with spec sheet full of lies and got ideas 😀

ElectroSoldier wrote on 2023-12-26, 04:23:

You guys are seem to be thinking how bad these monitors are going to be but what I want to display is so basic it wont matter... Its just black lines on a white screen. Red dots, green dots and some text.

Doesnt matter what you want to display, and its not about quality of the screens. Even if all you want is bright squares Composite LCDs make no sense exactly because of the input method. It doesnt matter that you found some (maybe even local, supermarket clearance etc) source of cheap panels when connecting them is hard precisely because of ancient Composite input.

ElectroSoldier wrote on 2023-12-26, 04:23:

I really dont want to explain the screen choice, its just a video card i need advice on....
I really dont need any help with the screens... Just the outputs.

Thats because you dont know how Composite signal works 🙁.
No, whatever you are looking at doesnt do 1440 x 234, it doesnt even do clean 480 x 234 due to digital to analog and another analog to digital conversions. The mere fact Chinese manufacturer decided to lie in the specification strongly suggests slightly blurry ~320x200 output.
No, there arent any cards with multiple composite outputs.
No, there arent any obtainable video wall processors with composite outputs. Video walls went from extremely expensive niche (Sony jumbotrons) to just expensive executive room/tv studio solutions from Matrox (dualhead/trippehead/quadhead reusing VGA/HDMI/DP screens) or Cyviz (https://www.quantelectronic.de/en/56942.html).
No, composite is not easy to convert like HDMI to DVI with passive converters, or HDMI to DP with small chip embedded in the cable. It requires a whole video processor.

weedeewee wrote on 2023-12-26, 17:52:

a quick ebay search for old ones that give multiple composite output feeds didn't reveal any candidates.

Because that was never a thing. I know of only Matrox dedicated CRT video wall solution, and afair even that worked with external box in tandem with video card. Matrox quickly pivoted to much more mass marketable VGA/hdmi/dp products https://www.techpowerup.com/review/matrox-tri … o-analog/3.html (~$20 on ebay now) https://www.wsgf.org/article/matrox-triplehea … -edition-review

ElectroSoldier wrote on 2023-12-26, 18:51:

weedeewee wrote on 2023-12-26, 18:32:

https://www.amazon.com/iseevy-Channel-Control … g/dp/B07C89ZHT6
Takes in 1 HDMI or DVI or VGA input
and divides that single input over 9 monitors/screens/displays.

I already have a matrix switcher that can do that and more.

No you dont, if you had one you would be making this thread 😀. Its not a switcher, its a dedicated video wall processor "splicing mode with 9 HDMI outputs 3x3, 2x4, 4x2, 2x3, 3x2, 2x2".

This thread has devolved to "how to google HDMI to Composite converter" 🙁
https://www.ebay.com/itm/385533385953 'hdmi to rca'
https://www.ebay.com/itm/403288439269 'dp to hdmi'
High chance of not working together due to being dodgy cheap products. Very high chance of low fidelity of resulting analog output.

I started the thread to find out if there was a single solution to my problem, which is a graphics card that outputs composite video 4 or 8 times.
I see now that isnt possible. thank you.

The matrix switcher I have is VGA not composite. If it was composite I wouldnt be making this thread...
No I dont have a video wall processor. Its not something Im interested in. I dont want to split a single output however many times over the screens, I want each screen to have its own output on a video card.

All the cheap chinese screens I can find on ebay all seem to use HDMi or VGA and some also have composite on a BNC and Displayport.
If I was using one of them then I would just use a video card that outputs to any of those connectors... I do already have video cards that can output to any of those digital outputs...

Other than them not being the best quality there is nothing wrong with them in their own right if used in spercific circumstance.

AS you clearly cant help me do what i want to do then I dont see any point carrying on this conversation, especially when all I get is derisory comments about the hardware I would like to use.

BitWrangler wrote on 2023-12-27, 01:19:

By the way, I don't think there's such a thing as a native composite panel. All the DVD and car headrest screens I have got inside of have a chip that does the composite video or also component to RGB analog conversion, so there's an RGB analog feed into whatever crappy flash convertors they could get cheap to feed the RGB 5:5:5 digital part, or it's serialised for LVDS in very much more modern stuff.

Anyway, what I'm saying is break out the analog RGB input then connect to multihead VGA.

One of the most interesting replies so far...
technically its not a cheap Chinese panel the likes of which you find on aliexpress or ebay.

It might sound like one, and might well be one under the skin but the only connectors it has is BNC in and BNC out 4 times, one for each panel.

VGA to RCA adapters exist.
Matrix switcher is not a video wall controller. One routes signals, the other splits'm up in parts.
Hooking up a digital panel with a composite input up to vga by removing the composite input and adding a vga to whatever adapter to drive the panel. sigh.

Might as well use a PiWall .

ElectroSoldier wrote on 2023-12-27, 01:29:

It might sound like one, and might well be one under the skin but the only connectors it has is BNC in and BNC out 4 times, one for each panel.

Link to product ?

weedeewee wrote on 2023-12-27, 05:45:

VGA to RCA adapters exist. Matrix switcher is not a video wall controller. One routes signals, the other splits'm up in parts. H […]
Show full quote

VGA to RCA adapters exist.
Matrix switcher is not a video wall controller. One routes signals, the other splits'm up in parts.
Hooking up a digital panel with a composite input up to vga by removing the composite input and adding a vga to whatever adapter to drive the panel. sigh.

Might as well use a PiWall .

ElectroSoldier wrote on 2023-12-27, 01:29:

It might sound like one, and might well be one under the skin but the only connectors it has is BNC in and BNC out 4 times, one for each panel.

Link to product ?

Does a Raspberry Pi have composite outputs? I thought they were all digital outputs on there.

Wrong thoughts ... --> https://help.yodeck.com/portal/en/kb/articles … ead-of-the-hdmi