Here’s an easy way to use your default webcam to take a photo with a single command from a terminal:
mplayer -vo png -frames 1 tv://
I wanted a quick and easy way to take a photo with my laptop’s webcam and upload it to my server on a regular basis when I’m away from my machine. Side note: this wasn’t to take photos of unknowing human victims, but to check in on my dogs :).
I realized that the first few frames weren’t great due to the camera turning on, so I had it take 5 frames:
mplayer -vo png -frames 5 tv://
I then wanted to upload them to my server to be accessible (behind nginx’s basic authentication so only those with the credentials can see them):
mplayer -vo png -frames 5 tv://; \ scp 00000005.png magnatecha.com:~/webroot/mydomain.com/cam/pic.png;
I also wanted to take the webcam photo on an interval:
while true; do \ mplayer -vo png -frames 5 tv://; \ scp 00000005.png magnatecha.com:~/webroot/mydomain.com/cam/pic.png; \ sleep 120; \ done;
That creates an infinite loop that takes 5 frames of photos, uploads the fifth one to my server, waits 120 seconds and then does it all again. This allows me to see a photo of whatever my laptop is pointed at that is at most 2 minutes old.