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Like many, I find one the big challenges with the Raspberry Pi, is how to connect and interact with it. In an earlier post, Raspberry Pi-Powered Dashboard Video Camera Using Motion and FFmpeg, I discussed the use of the Raspberry Pi, combined with a webcam, Motion, and FFmpeg, to create a low-cost dashboard video camera. Recently, I purchased a USB-powered wireless router for to use with my Raspberry Pi when travelling. Set up your own private wireless network in your vehicle, hotel, or coffee shop. Use a low-cost nano-size wireless router to connect to your Raspberry Pi while traveling. In my example below, I have two possible webcams that might be connected, so I search (grep) for either ID. If no webcam is found, the Motion script exits without starting.
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This code calls the new function when Motion’s ‘start’ command is executed. Next add the following statement to the beginning of the ‘start’ function.
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If you change your webcam model, remember to update the ID you entered in this function. You will need to modify the function, changing the string ‘0000:ABCD’, to match your webcam’s ID. Next, open the Motion startup script, using the following command: sudo nano /etc/init.d/motionĪdd the following ‘check_for_webcam ()’ function to the top of the script, adjacent to the existing ‘check_daemon_enabled()’ function: # Check if specific webcam(s) are connected to PiĮcho "No webcam found? Shutting down Motion!" I found this post particularly helpful, The Webcam HOWTO. There are several ways to detect your webcam, depending on you Linux distro. I ran the command twice in this example, to identify both of my webcams. You should see similar output to the example below.
![ffmpeg linux watch folders ffmpeg linux watch folders](https://tartube.sourceforge.io/screenshots/example4.png)
Run the following command to list the USB devices connected to the Pi: lsusb Find Your Webcamįirst, attach your webcam to the Raspberry Pi. It also saves a lot of wasted time moving videos and images off the Pi that end up being blank, because no webcam was connected. This saves a lot of wasted processing on the Pi. No blank images or empty time-lapse videos are created. If not, it immediately exits the script, without ever starting Motion.
![ffmpeg linux watch folders ffmpeg linux watch folders](http://lasopachef128.weebly.com/uploads/1/2/4/6/124698882/847019570.png)
When the system calls Motion on startup, the new function checks if a webcam is connected. To get prevent Motion from starting up without a webcam connected, I’ve added a simple function to the Motion startup script. However, when I get home and plug my Pi back into my local network, Motion starts up again and starts recording blank images and creating the time-lapse video, even though there is no webcam connected. The dash-cam starts capturing images and making the time-lapse video. When I start my car, the Raspberry Pi boots-up, and subsequently, Motion starts. However, an issue I still struggled with when using the dash-cam was Motion running without a webcam connected. If you read my post, Raspberry Pi-Powered Dashboard Video Camera Using Motion and FFmpeg, you know Motion with FFmpeg on a Raspberry Pi makes an ideal dashboard camera system.