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I'd like to stream the output of two cameras to a separate process. Right now, it looks like the best way to do that is to grab the rendered camera views from the screen via platform specific screen capture hooks then compress them real time with h.264. Is there a way to grab the input of the cameras within unity and avoid rendering them to the screen?

One solution I'm considering involves using Unity's multiplayer capability to run the game on a separate machine and grab it from that screen buffer, unbeknownst to the player.

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You're throwing around many ideas: Virtual robot eyes and ears, crowd-sourcing, artificial intelligence, research... Which one of those is your question? – Anko Feb 25 at 20:35
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What do you mean exactly by a "camera stream from Unity"? Do you mean to get video recording and project it into a 3D environment inside Unity? Do you mean to have two video input streams on different textures inside Unity? Do you mean using Unity to generate a video stream? – Tetrad Feb 25 at 23:28
Also, check the faq: "Your questions should be reasonably scoped. If you can imagine an entire book that answers your question, you’re asking too much." – Laurent Couvidou Feb 26 at 13:14
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Question is very vague. What exactly are you trying to achieve? – Jason Coombes Mar 4 at 9:17

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