Electronics > Projects, Designs, and Technical Stuff

Recording HDMI

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Jan Audio:
Hi, i was talking to someone who bought a box to use for recording HDMI.
Some special box he need for streaming for twitch so people can watch him play games.

I think he got ripped off, it is not allowed to sell a device that can record HDMI or am i wrong ?
There are no HDMI video recorders in any shop.

What chip do you need to make a simple HDMI recorder to SD card ?
I bet a PIC32 in DIP can not handle it as usual.

What do you think about it, does he got ripped off for 500 ?, is twitch selling these devices maybe indirect ?
I have the feeling he wont be earning his money back.

ebclr:
HDMI can be recorded if not HDCP involved,


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NiHaoMike:
A LKV373A is about $30 for 1080p capture. Add about $10 for a splitter that defeats HDCP. Or about $40 for a splitter that can downscale 4K if he wants to play at 4K but stream at 1080p.

4K capture is a lot more expensive.

DaJMasta:
HDCP stripping exists and can be bought, perhaps more doubiously, but as commercial products.  HDMI recording without HDCP can be done fine, legally - I've got a ~$75 box that let's me do 1080p60 capture for my digital microscope and it works great.


As for what you need - single chip solutions to capture exist, but a regular SD card isn't going to be able to keep up with the bandwidth.  To store it, you'd need an encoder of some sort, then still a pretty fast storage medium.  By no means impossible, but much easier to do not as a standalone where you can just send all that data to a device that can process it without issue.

Capture cards are essential for the broadcasting industry now - and that's not just for streamers - so there is a large market for them and especially if they have 4k60 capability or multiple inputs, $500 or more could be quite justified.

NiHaoMike:
I have bought two HDMI splitters that happen to strip HDCP out of the box. One of those I bought with the intent of hacking it into a HDCP stripper after I read an article about it, the other I bought for the audio extraction feature. Not sure if I'll ever take advantage of the HDCP stripping feature since I boycott DRM in the first place, but it's ready if I ever find the need for it.

The LKV373A has a H.264 encoder built in. That's usually a plus, but for some applications like performing machine vision on the HDMI signal, that gets in the way and there are USB 3.0 capture adapters that deliver an uncompressed capture.

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