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Framegrabber / Scaler
For the conferences we are covering, most presenters use their own PC. The resolution and frame rates of these PCs widely differ. To get a consistent signal into the video mixer, we have to scale or convert the output signal to a uniform type. Another similar list from the timevideo project can be found on https://github.com/timvideos/HDMI2USB/wiki/Alternatives
Currently in use in our setup
Other options currently not in our main setup
IP based
-
- ~3-10sec latency on the stream output
- high price ~1k€
- IP Based HDMI extender with decoder software
MIPI Camera Serial Interface (CSI) HDMI adpater (e.g. for Raspberry Pi)
USB2 / USB3 based
Those devices are usualy accessed via Video4Linux2. USB3 / 3.1 capable devices are mostly UVC devices. A recent (> 5.0) Kernel is recommendet. The linux tool uvcdynctrl - libwebcam command line tool can be used to tweak settings.
- HDMI2USB (we have one of these, also used by debian video team with voctomix)
- HD Capture USB (TLDR electronic waste)
- hdmitousb31 (good video quaility but not always stable in our tests)
- elgato-cam-link (Raw video, 4K support, stable, tested with 3 devices on an t460, ~150€)
Scaller to be used in combination with a capture device
- 'professional' scaler aka 'Folson Image Pro HD 2'
- we only rent these if necessary for more complex setups e.g. used at C3
- some [e.g. Analogway Pulse] can also be used as seemless switcher
- expensive
- A list of potential interesting frame grabber hardware which we have not tested yet