3

USB is a standard and must have 5V. The 12V you mention are the output ratings for the HUB's power supply. To be compatible with USB there must be an additional DCDC converter inside the HUB. Whether this HUB is capable of driving 2 RPis or not depends on the current it can provide, not its output voltage. A voltage of ~5.5V must not be exceeded! Note that ...


3

I doubt there is a definite answer to that. This lens is an OEM device and to my knowledge the Foundation's documentation does not provide any details about the lens, it's holder and their mechanical interface. Why am I asked to move to a different standard? I would contribute that to the availability of standard lenses of a different size, e.g. M12. ...


2

You can record as it is like any other computers do, you just need to have a free space left on you sdcard todo so. Also, there is a life expectancy for every storage device, it is called the read and write cycle, it may not affect your sdcard directly but it may in a longer run. See: https://superuser.com/questions/17350/whats-the-life-expectancy-of-an-sd-...


2

Regarding the official answer on Raspberry Pi forum, it is not possible to include B-Frames into h264 stream since hardware encoder doesn't support it.


2

How about something like the following. I'm using a list to store your pan and tilt values and capturing 1 image on each loop. Simply concatenating the string value of i onto 'image' followed by .'jpg' to create the image name. #!/usr/bin/env python3 import pantilthat,time,picamera panTilt = [[ 30, -10], [ 20, 0], [ 10, 10], ...


2

In the simplest form, the sender simply reads the file and writes its contents to the UART, while the receiver opens the UART and keeps reading bytes until there's nothing left (with a reasonable timeout), then stores these bytes to a file. For more complex cases, check out serial data transmission protocols such as XMODEM / YMODEM / ZMODEM. The advantage ...


2

Two major problems: the first is, of course, that neither the CSI nor the DSI interfaces are documented openly, so even if it is possible to switch the signal assignments in software (it may not be), you still have to figure out how to do it. The second problem is that the SDA/SCL signals on the connectors are in different places (look at the (partial) ...


1

In the UK at the moment: PiHut and Pimironi both have stock. RS components have just shy of 13K ready to go. Farnell are out until september. Pi supply are also out. I was to see a couple out of stock which may suggest a delay somewhere? I'm guessing postage costs to India would be significant?


1

From my experience , for raspivid option: --preview, -p Preview window settings <'x,y,w,h'> You can use this for your raspivid window position on the screen. Assume raspivid on the left on your screen, then you can open vlc in a new window and put it on the right of the screen. If you want a foreground window, you can use OPENCV highgui and put ...


1

I have the same issue. Raspberry Pi 3 B+, Raspbian Stretch 9, camera module v1.3, saving to SD. Using following flags, should be 12 pictures over 1 hour. raspistill -v -bm -vf -hf -awb cloud -br 60 -sa 40 -t 3600000 -tl 300000 -q 100 -o image%04d.jpg I was getting the issue where mmal skips frames and names an image randomly (or by time stamp?) and then ...


1

I have found that the solution mentioned in https://www.linux-projects.org/uv4l/installation/ works well. Out-of-the box, the video will have a text overlay, but if you give a "contribution" of $15 or so, and email the author, you can get a key that removes the text. I'm getting low-latency (0.5 sec or so) video at 1280 X 960 @ 30fps from a Model 3B ...


1

I tried excluding GL related shared libraries at linking to trace the function dependencies and was surprised brcmGLESv2 brcmEGL and vcos were not even needed for linking! In fact vcos was the one that broke Qt GL dependency. So leaving out brcmGLESv2 brcmEGL and vcos allows Qt GUI to start up and I can show the raspicam preview "over" a qt dialog window ...


1

The only way to play H264 video streams with standard web technologies is WebRTC. UV4L has been supporting WebRTC for years now, and the project website is plenty of examples, tutorials and demos made for the Raspberry Pi showing how to run custom web applications with UV4L itself providing H264 hardware-encoded streams in the pages.


1

have you had a look at motioneyeos. It's a pre-built distro for doing just that. You get a variety of options for controling the camera framerate etc or you can choose to have it as a simple IP camera and view the feed as you wish on any computer.


1

You can’t combine 2 composite video outputs - you would just get a corrupted output. You would need some form of switcher to switch one or the other.


1

Thanks everyone for suggestions. Finally I selected IVport multiplexer: http://www.ivmech.com/magaza/en/development-modules-c-4/ivport-raspberry-pi-camera-module-multiplexer-p-90 It allows up to 4 cameras per adapter, and by stacking 4 of them, up to 16 cameras per board. It is not very cheap though, but as far as I am concerned, reduces the amount of ...


1

You can save your video files directly to the SD card - provided you have sufficient space on the card. "Sufficient space" will obviously depend upon what size card you have, and how big your video files are. I assume you can calculate this, and you haven't provided file or SD card sizes, so... If you're worried about SD card corruption, you can always ...


1

Adding to Pedro Lobito's response: While I was testing at the command line using v4l2-ctl to perform test captures a lot of the supported pixelformats failed with "Operation not permitted" when trying for the full resolution supported by the chip 3280x2464 or just hang indefinitely with no error message and restarting the terminal and running any v4l2-ctl ...


1

I was getting VIDIOC_STREAMON: Operation not permitted while using cv2.VideoCapture(0). Setting the GPU memory to a higher value, solved the problem.


1

Install motion from github and build it yourself. This is how to do it: sudo mkdir motion sudo cd motion sudo apt-get install autoconf automake build-essential pkgconf libtool libzip-dev libjpeg-dev git libavformat-dev libavcodec-dev libavutil-dev libswscale-dev libavdevice-dev libwebp-dev gettext libmicrohttpd-dev git clone https://github.com/Motion-...


1

In Python you can use https://github.com/OsmoSystems/picamraw/ to extract the raw Bayer data or a rudimentary demosaiced RGB image. The result is a numpy array that you can use with a variety of other python tools. This basic example should display the raw image: First, install matplotlib and picamraw with pip install matplotlib picamraw. Then, import the ...


1

Have you tried capturing in separate scripts? You could write a new script for each resolution you wanted, store the files and have them managed or run via a processing script. Will try and build this myself over the weekend and see if I can add some code to this answer, but the theory should work.


1

According to the Picamera Documentation in part 3.5 of the basic recipes section: You may wish to capture a sequence of images all of which look the same in terms of brightness, color, and contrast (this can be useful in timelapse photography, for example). Various attributes need to be used in order to ensure consistency across multiple shots. ...


1

After searching a lot I finally have this working now to get it working I used the following script for the configfs setup https://gist.github.com/kbingham/c39c4cc7c20882a104c08df5206e2f9f and this version of the uvc-gadget tool https://github.com/wlhe/uvc-gadget


1

I had the same problem. My Pi Zero W worked fine for 10 hours or so and then various kernel panic messages. The errors would get more frequent and at a point I could no longer connect to the Pi. It looks like the Pi is under-volted for this job. After some investigation I solved this by adding the following lines to the file /boot/config.txt over_voltage=...


1

This is happening due to awb_mode which is set to 'auto' by default.I was facing the same problem and when I set the awb_mode to 'fluorescent' ,the image color was quit natural. Below is my python code: from time import sleep from picamera import PiCamera camera = PiCamera(resolution=(1280, 720), framerate=30) # Wait for the automatic gain control to ...


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