31–40 of 78 posts
Are the gamer HDMI capture devices expensive because they have a low latency? (Besides the verticality of the market.)
The method in the link gives you the raw HDMI stream, which you can containerize to play in VLC and the like, but you wind up with some pretty large files.
You could potentially be capturing a raw 4 to 18 Gbps stream.
How would one go about compressing the captured stream? I read it can be containerized as an MKV, but then would you re-encode as H.264, or is there a better codec? I assume there is a quality vs time to encode trade-off? Also, would this be a component in a viable DIY HDMI matrix switch? I see this 4 input / 8 output 4K HDMI matrix switch for only $169 on Amazon here: http://amzn.to/28Ykyor So, cost-wise not viable,…
no need, just buy never version: https://blog.danman.eu/new-version-of-lenkeng-hdmi-over-ip-e...
I had not considered using a raspberry pi on the receiving end.
Any thoughts on using multiple Pis to receive the same stream?
I would like to take the output from an HDMI source and display it on multiple displays throughout my house.
Are the gamer HDMI capture devices expensive because they have a low latency? (Besides the verticality of the market.)
I believe they are also doing the encoding into a compressed format. The method in the link gives you the raw HDMI stream, which you can containerize to play in VLC and the like, but you wind up with some pretty large files. You could potentially be capturing a raw 4 to 18 Gbps stream.
[Edit: Added MJPEG, as this seems to be case for the device in the article]
A. Well, Duh!
B. Well played reverse engineering Sir!
C. Oh no, I need to do better next time!You can also use devices that are USB Video Class (UVC) compliant, thus which don't require any drivers. libuvc can be used to capture from these devices: https://github.com/ktossell/libuvc You can get cheap off-brand UVC USB grabbers, or you can get higher quality gear, like the AJA U-TAP: https://www.aja.com/en/products/u-tap Admittedly though I haven't seen anything that comes close to £45 :-)
You can also use devices that are USB Video Class (UVC) compliant, thus which don't require any drivers. libuvc can be used to capture from these devices: https://github.com/ktossell/libuvc You can get cheap off-brand UVC USB grabbers, or you can get higher quality gear, like the AJA U-TAP: https://www.aja.com/en/products/u-tap Admittedly though I haven't seen anything that comes close to £45 :-)
https://www.amazon.com/Magewell-HDMI-USB-Capture-Dongle/dp/B...
Can do lossless capture with extremely low latency, which is pretty nice - it's good enough that I've been able to play console video games on it directly instead of plugging into a TV.
Cool hack, but the part about the cost of off-the-shelf solutions is wildly wrong - Blackmagic's HDMI capture solutions can be purchased for less than 145usd for pci-e and 200usd for usb3 and they have free drivers&sdk for linux.
How is the latency with something like this? I would assume it's pretty much real time when dealing with the raw data, encoding could add some latency. Am I correct?