LKV373 HDMI framegrabber

[micolous]

There's a HDMI extender device, Lenkeng LKV373, which captures HDMI, and transcodes the video into MJPEG (much like HDMI2USB) and outputs the stream over multicast UDP.

They're designed to run as a pair of sender + receiver, but someone has reverse engineered the wire protocol, and written some notes on reverse engineering the units:

http://danman.eu/blog/?p=110

In the comments there seems to be notes about a TTL serial interface which allows control of encoder parameters. It streams 1080p video at about 18fps -- more than adequate for capturing slides.

In a real-world setup, you would still use the receiver hardware, in order to output the video to a projector. As they output to ethernet, there would be no need to have the "projector laptop" as in a typical capture scenario, or that would be needed with HDMI2USB. With some gstreamer trickery, this could appear as a source.

I can see these on places like Aliexpress for about 80 USD in lots of 1 (of both sender + receiver). I haven't yet ordered one but it looks promising.

[mithro]

See https://groups.google.com/d/topic/hdmi2usb/-wHf7HNyVK4/discussion for further discussion on this device.

[kripton]

See also issue #24