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Lightboosted 120hz signal to capture card?

post #1 of 5
Thread Starter 
I have a dual PC streaming setup. I am planning to stream gameplay (playing in 120hz) using the lightboost hack. I already have the DVI-DL splitter which can split the 120hz signal but I'm unsure if the capture card can see the input of 120hz *with lightboost*. I don't know what that does to the signal/picture. The capture card is a Datapath VisionDVI-DL. It is capable of 120hz input with reduced blanking (330MHz pixel clock limitation).

Any insight would be appreciated.

Gaming PC (120hz w/Lightboost)
DVI-DL Splitter >>>> BenQ XL2420T (EDID Info for Vid Card comes from this output)
DVI-DL Splitter >>>> Datapath VisionDVI-DL Capture Card (Streaming PC)
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post #2 of 5

No lightboost has to do with the brightness of the screen so it's not in the signal. This is speculation on my part.

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post #3 of 5
There's no special LightBoost signal in the DVI signal.
Some minor tweakings of the timings & resolution (e.g. a slightly lengthened blanking interval - Vertical Total of 1149)
But nothing other than that.

LightBoost is simply a computer monitor feature.
First-stage LightBoost activation is by the nVidia drivers using the I2C line (DDC line), using a proprietary nVidia handshake.
Second-stage LightBoost activation is sending a standard 1080p signal with simply a slightly lengthened blanking interval.

If your capture card can successfully capture a 120Hz signal, it should be able to capture it, regardless of whether it's LightBoost or non-LightBoost, and there is no motion blur difference in the native recording (regardless of whether you recorded a 120Hz that was shown on a LightBoost vs. non-LightBoost display) -- it's the monitor that presents it with or without motion blur.

It's just a standard 120fps recording (if you can record 120fps), regardless of whether you displayed it to CRT, non-Lightboost, or LightBoost, or whatever display technology. Upon playback, the motion clarity of the playback will be dependant on the PLAYBACK monitor. (Playing the recording on a CRT or LightBoost, will eliminate the motion blur - even if when it was originally being recored, it was displayed at the time to a motion-blurry display). Especially if you used high quality video recording.
post #4 of 5
Quote:
Originally Posted by Legonut View Post

No lightboost has to do with the brightness of the screen so it's not in the signal. This is speculation on my part.
LightBoost is a strobe backlight invented by nVidia for 3D Vision to serve three purposes simultaneously:

1. Reduce 3D crosstalk.
2. Make image brighter with 3D glasses.
3. Eliminate motion blur. (good for 2D too, without 3D glasses)

Obviously, the third item is the most important feature, from the Blur Busters perspective.
(See the LightBoost FAQ)

Currently, it's now most popular for purpose #3, ever since tweaks/hacks was discovered to use LightBoost without needing a 3D Vision Kit.
post #5 of 5
Thread Starter 
Quote:
Originally Posted by mdrejhon View Post

There's no special LightBoost signal in the DVI signal.
Some minor tweakings of the timings & resolution (e.g. a slightly lengthened blanking interval - Vertical Total of 1149)
But nothing other than that.

LightBoost is simply a computer monitor feature.
First-stage LightBoost activation is by the nVidia drivers using the I2C line (DDC line), using a proprietary nVidia handshake.
Second-stage LightBoost activation is sending a standard 1080p signal with simply a slightly lengthened blanking interval.

If your capture card can successfully capture a 120Hz signal, it should be able to capture it, regardless of whether it's LightBoost or non-LightBoost, and there is no motion blur difference in the native recording (regardless of whether you recorded a 120Hz that was shown on a LightBoost vs. non-LightBoost display) -- it's the monitor that presents it with or without motion blur.

It's just a standard 120fps recording (if you can record 120fps), regardless of whether you displayed it to CRT, non-Lightboost, or LightBoost, or whatever display technology. Upon playback, the motion clarity of the playback will be dependant on the PLAYBACK monitor. (Playing the recording on a CRT or LightBoost, will eliminate the motion blur - even if when it was originally being recored, it was displayed at the time to a motion-blurry display). Especially if you used high quality video recording.

Exactly what I wanted to hear! Thanks. There isn't a ton of info out there explaining how this all works.

I actually stream/record at 60fps but there are only a couple of capture cards capable of 120hz input.
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X79 Tri-Sli Gamer
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OCZ Vertex 4 (256) Windows 8.1 Benq 2420T Benq 2420T 
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Windows 8.1 BenQ GW2450HM 24in LCD BenQ GW2450HM 24in LCD BenQ GW2450HM 24in LCD 
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