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Unfortunately there is no perfect or exact answer. Your question topic mentions HD-SDI, which is a digital signal. Those tends to degrade 'cliff-wise', unlike analog signals where degradation is gradual. It will partly depend on the quality of the receiving device -- whether or not, or how well, it can capture the signal as the eye pattern turns to mush. ...


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You are best off to convert from a supported format (DVI, HDMI, maybe even DisplayPort) to SDI. SDI cards are not designed for gaming, they are designed for workstations and video. You aren't going to get a good quality gaming graphics card with SDI outputs.


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For amateur events, SDI may be overkill compared to using simple Component. The key for long runs is to separate the various components so that they don't degrade. There is a similar question here about long distance runs. As for HDMI to SDI, there should be no quality loss compared to HDMI as both are digital formats supporting full uncompressed HD ...


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The GoPro would be a perfect candidate for what you want. It's a so called "action camera" and is a very robust (water tight with case) wide-angle camera that can shoot in very high frame rates with HD resolution (even more at lower frame rates). Suitable recording options for high speed sport events would 1080p @ 60FPS or 720p @ 120FPS. The camera also has ...


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Most current graphics cards will have HDMI output and a HDMI to SDI convertor might be cheaper solution than a DVI to SDI.


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I found this rack mount device called DVEO D-Streamer IP/DIG. One of DVEO's press relises announced $4000 price for the device. Inputs: HTTP Live (HLS), UDP, RTP, RTSP, HTTP, RTMP (Open Flash), MMS. Output: SD/HD-SDI.



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