How do I access my default video camera on my mac? I know on Linux it is /dev/video0 but my Mac does not have that. I'm trying to capture my webcam into ffmpeg
ffmpeg -i /dev/video0
But it won't work because /dev/video0 doesn't exist.
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Unfortunately, it appears that ffmpeg can't record using the iSight, as reported in a ffmpeg-users thread.
Really a shame that Apple doesn't expose this functionality!
Macs use the AVFoundation framework to expose the camera programatically.
You'll want to start with the StopNGo sample project if you've got a copy of Xcode. (and just browsing the source may help figure if you care to go down that path without needing Xcode to make a decision)
It would be a big security risk to expose that API to the terminal on every mac by default, but someone may have writen a bridge you could use.
You might need to ask that specifically on the programming sites. Your query looking for an equivalent to attaching a pre-existing device is advanced consumer and on-topic here. Getting into API usage is generally off topic even when the simple "consumer" answer is "no - the equivalent video device isn't available on Mac OS X"