General SDI vs. HDMI Information
SDI is easier to connect to other professional equipment than HDMI. It is an all purpose signal, as opposed to HDMI that was originally intended only to connect to consumer display devices. There may be a slight advantage in quality where HDMI can be limited to 4:2:0 subsampling at certain resolutions, where SDI will usually ...
SDI stands for Serial Digital Interface. Over time, the bandwidth needs of video have changed drastically, and so SDI has gone through a number of revisions and different solutions for handling the ever increasing bandwidth loads.
3G, 6G and 12G SDI all refer to single conductor bandwidth specs. They refer to the maximum data rate supported. 3G is ...
Wikipedia does mention it - with a reference link included:
Within this standard there are three formats known as Level A, Level B
Dual Link (B-DL) and Level B Dual Stream (B-DS). The Level A format is
the direct mapping of uncompressed 1080p (up to 60 fps) video into a
serial digital interface at the nominal 3 Gbit/s. The Level B-DL
format is the ...
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.
Not sure exactly if this will help at all but you used to be able to do something like this:
ffmpeg -f decklink -i "DeckLink Mini Recorder (1)@7"
Where 7 is the number that is outputed in the supported formats list and the (1) is used if you have multiple decklink cards. Again not sure if this helps you or not as I was using it for capture cards.
SDI is a professional, locking video connection system over coax cable. SDI itself has more expensive licensing costs associated with it than HDMI, so hardware that supports it will generally be more expensive. If you don't have hardware that supports SDI, it won't do you any good, so that's the first point.
One of the biggest advantages of SDI is that it ...
In short; HD-SDI and SDI are the industry standard for professional applications; and HDMI is for consumers.
HDMI is highly limited in terms of length; you will need a very high quality cable to go more than 25 feet.
HDMI is fine for most applications; but it is limited to 4:2:2; you can't do long runs; if you are trying to integrate it with professional ...
You need to use cable specifically designed for SDI. RG59 essentially only defines the impedance and capacitance of the cable, not the return loss and attenuation characteristics. You can use reference charts from cable manufacturers like Belden and Gepco to select the right cable for your situation.
As the docs say,
you need the Blackmagic DeckLink SDK and you need to configure with
the appropriate --extra-cflags and --extra-ldflags. On Windows, you
need to run the IDL files through widl
If so, run
ffmpeg -re -i rtmp://server/live/streamname -c:v rawvideo -pix_fmt uyvy422 -vf scale=720x576 -c:a pcm_s16le -ar 48000 -ac 2 -f decklink "Device"
Both RED and Alexa cameras offer this feature, and the Sound Devices PIX 240i reads it. But nowhere on the Internet is there any documentation that your SONY camera offers this feature. Either SONY doesn't have it, or they greatly need to improve their documentation.
I'm going to assume you want to view all 18 HDMI inputs simultaneously on a few monitors, then be able to send one of those inputs to an output for broadcast/presentation? I don't know what sort of effects you need, or anything else like that, but maybe this will get you on the right track. Or if you need the switcher to be seamless (i.e: no momentary signal ...
Only the 4K models of the Atom switchers support 1080p in 60 fps, like the ATEM 2 M/E Production Studio 4K.
Although a software control panel is included, I would prefer a hardware panel. Switching between 18+ input sources will be so stressful, that you don't have time looking where the mouse pointer is. A hardware panel has big buttons and knobs that you ...
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 ...