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Simplest video grab from webcam: how to

On Raspbery Pi's Raspbian (based on Debian Wheezy) I'm trying to make a simplest video grab from a Logitech C910 webcam to a video file via ffmpeg/avconv. I say: $ avconv -t 5 -f video4linux2 -s ...
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Encoding multiple video streams with a single avconv invocation

I played with avconv on Ubuntu and I'm now able to e.g. record the desktop with sound from a soundcard. One thing I wanted to do was recording two video inputs at the same time, for instance the ...