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 Post subject: Re: DIY video digitizer & scandoubler
PostPosted: Thu May 18, 2017 2:52 pm 


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Joined: 06 Oct 2015
Posts: 1627
Location: Canada
It's not lying: as I said, the shutter speed setting ensures that no part of the frame is exposed for longer than that. It's just that it doesn't all get exposed at the same time.

Cameras with global shutters do expose the entire frame at once, so they solve the problem, but these days they tend to be restricted to professional film cameras (RED, Arri, BlackMagic, etc).

CCD sensors tend to be global shutters, while CMOS sensors (used in most cameras these days) tend to be rolling. A few sensor manufacturers have announced CMOS sensors with global shutters in the past few years, but I'm not sure if any of them have made it into actual products.


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 Post subject: Re: DIY video digitizer & scandoubler
PostPosted: Thu May 18, 2017 5:50 pm 



Joined: 12 Sep 2012
Posts: 118
I think it's a problem with English language that people get confused. As a french, when I saw review of lenses for the first time, when they were saying "this lens is fast, this one is not so fast", I was thinking they were talking about the autofocus speed. It took some time for me to understand they were actually talking about the aperture of the lenses.

I think it's the same for the shutter. The "shutter speed" setting does not control the actual "speed" of the shutter, but the time a part of the sensor get exposed, as Guspaz explained. The shutter actually always moves at the same speed. They control the time a part of the sensor get exposed by changing the delay between the first curtain starts to open and the second curtain starts to close, as you can see in the Slo Mo Guys video I posted.


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 Post subject: Re: DIY video digitizer & scandoubler
PostPosted: Sat May 20, 2017 9:15 am 



Joined: 30 Aug 2015
Posts: 29
I have a weird problem with OSSC video output.. It used to work properly earlier, but now the output video signal from OSSC works OK with some displays/devices only, and with other devices it's "weird color" and/or glitchy or really noisy. Here's some examples:

- OSSC --> Dell 23" display: OK.
- OSSC --> HDMI-to-VGA converter: OK.

- OSSC --> Dell 24" display: FAIL, output video is purple/blue and/or glitchy and/or noisy.
- OSSC --> Extron video processor: FAIL, output video is green and/or glitchy and/or noisy.
- OSSC --> Another Extron video processor: FAIL, output video is green and/or glitchy and/or noisy.

This problem happens even with the default "calibration picture" of OSSC (when no OSSC input is selected), so it's the default 480p @ 59.54 Hz mode. See these pics for examples:

- http://pasik.reaktio.net/ossc-problem01.png
- http://pasik.reaktio.net/ossc-problem02.png (the moire pattern here is from my camera, it's not on actual output signal).

I've tried all the OSSC firmware versions (currently using v0.76), and they don't seem to affect this behaviour. I suspect it's somehow OSSC hardware related.. my OSSC is from the first batch, v1.4-DVI.

I've also tried all the "basic troubleshooting" steps, meaning multiple different displays / video processors, multiple DVI/HDMI cables, etc.. and I've resetted the OSSC settings to defaults aswell. No help.

Any ideas what might cause this? And how to fix it..

(yeah, I had the OSSC fuse blown recently, but this video output problem started before i messed up with the power supply and blew the fuse.. actually this output problem is exactly the reason why I wanted to try another power supply to rule out if the problem is caused by a bad PSU - and that's confirmed now, I have exactly the same video output problem with two different PSUs, so I don't think OSSC PSU is causing this problem).


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 Post subject: Re: DIY video digitizer & scandoubler
PostPosted: Sun May 21, 2017 4:23 pm 



Joined: 21 May 2017
Posts: 1
Hi,
Will there be any future option for the OSSC that will allow it to ignore sync and "force" 240p? That would universally fix the 240p/480i switching issues in games like Silent Hill.


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 Post subject: Re: DIY video digitizer & scandoubler
PostPosted: Sun May 21, 2017 8:21 pm 


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Joined: 15 Dec 2012
Posts: 418
Location: Finland
Nrg wrote:
I have a weird problem with OSSC video output.. It used to work properly earlier, but now the output video signal from OSSC works OK with some displays/devices only, and with other devices it's "weird color" and/or glitchy or really noisy. Here's some examples:
Sounds like HDMI transmitter chip may have got damaged - see this post and follow-up about how to check whether it is so.


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 Post subject: Re: DIY video digitizer & scandoubler
PostPosted: Mon May 22, 2017 5:06 pm 


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Joined: 02 Oct 2010
Posts: 2721
Location: UK
Quote:
Hi,
Will there be any future option for the OSSC that will allow it to ignore sync and "force" 240p? That would universally fix the 240p/480i switching issues in games like Silent Hill.


It's not as simple as that, when consoles change 240p->480i the refresh rate changes too.
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OSSC Forums - http://www.videogameperfection.com/forums
Please check the XRGB Wiki before posting about the OSSC, XRGB Mini or XRGB3 - http://junkerhq.net/xrgb/index.php/Main_Page


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 Post subject: Re: DIY video digitizer & scandoubler
PostPosted: Mon May 22, 2017 7:06 pm 



Joined: 02 Dec 2011
Posts: 5
Found out about this thing waaaaaay too late, #4346 in line now :shock:


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