I want to use Rasbery Pi for lecture capture. Please advise how to do it.

Question

mconners · Answer

Man, is google broken where you live? http://lmgtfy.com/?q=max+usb+length Mike

shabaz · Answer

So there's your answer(!). If you think that solution is available for download or purchase, why not obtain or purchase it? Otherwise, you'd have to either design a solution using the Pi, or expect to pay what an off-the-shelf solution costs.

clem57 · Answer

Oh. The USB 480Mbit/s interface is shared with the Ethernet 10/100 Mbit/s cable so simultaneous sending data to a central site would definitely interfere with the recording fps even if you use wireless USB (recently announced RPi 3 excepted). I assume you mean one setup per classroom. If you want a central collection, a video surveillance system may work but would be totally different (since they only detect motion to record).. Clem

shabaz · Answer

There isn't a (known) solution with RPI, unless you're prepared to design it. You didn't specify if you wanted this for recording lectures in a high quality, or a lower quality for surveillance purposes. Expect to pay at least $10k-$20k for the recording system alone, and perhaps a further $10k for the 20 cameras, if you want to record audio and video. (This is surveillance quality, barely usable for a lecture theatre multi-camera recording solution). Otherwise, go with an analog camera system and a hard drive recorder at a very small fraction of this cost, but it won't record audio from all cameras usually, and the frame rate will be very poor (as will resolution - but 'good enough' for basic security).

mconners · Answer

You've described a couple of different scenarios. In the video, they showed the setup that Clem initially proposed. A raspberry pi, with a camera in a microphone in a room. That is pretty easy to setup. You then added the complexity of sending that video/audio data to a central location to be controlled by an operator. Clem pointed out the the Pi probably doesn't have the IO bandwidth for that. It would be inexpensive to setup 1 pi per room, then transfer the recorded video after the fact via network. You could easily mimic the setup they show in the video, and compromise on the central control and data capture. Mike

clem57 · Answer

Is this in central location? It only has one channel for one camera/audio. If does not include the camera or microphone. clem

shabaz · Answer

Wow. Then expect the budget to increase by an order of magnitude, $200-$300k would not be unreasonable! Alternatively, you could train the teachers to present using a PC, and then use something like webex..