I like to run a cron that snapshots a cam like this: * 9-17 * * 1-5 vlc -I dummy v4l2:///dev/video0 --video-filter scene --no-audio --scene-path /home/foo/tmp/cam --scene-prefix snapshot --scene-f...

I'm using openCV via python on linux (ubuntu 12.04), and I have a logitech c920 from which I'd like to grab images. Cheese is able to grab frames up to really high resolutions, but whenever I try t...

I have this code trying to capture a frame from my webcam on raspberry pi, and saving it as an image. I use opencv 2, but I get strange errors when I run the code.. import time import sys from sub...

I am working on an openCV project, I have a stable running variant that is taking input from an HDMI capture card and using FFmpeg to output to a v4L2 loopback device (/dev/video0) my openCV projec...

Am using Ubuntu(14.04) and I am getting this error while trying to use gstreamer. gst-launch-1.0 v4l2src ! video/x-raw,width=640,height=480 ! x264enc ! h264parse ! rtph264pay ! udpsink host=127.0...

This question is very similar to V4L2 absolute exposure setting has (almost) not effect I have a UVC compliant camera that I am running on a Raspberry Pi CM3+ module. It appears as video0. Using t...

I am trying to create a loopback device from my webcam to be accessible from both Zoom and a browser. I created three v4l2loopback devices: sudo modprobe v4l2loopback devices=3 video_nr=10,11,12 ca...

Working with v4l2loopback devices I can run these two virtual devices: a) running the preview image from a Canon DSLR via USB through v4l2loopback into OBS: modprobe v4l2loopback gphoto2 --stdout...

I am not sure why this pipeline is breaking, I have gstreamer installed on linux from the websites exact instructions, any ideas? gst-launch-1.0 v4l2src device=/dev/video0 ! videoscale ! video/x-ra...

Using iTerm, I'm SSHing into my raspberry pi (raspbian) to control a home security system I've setup. I need to change the focus of my camera, so I'm running v4l2-ctl -c focus_absolute=0 on my term...

I am trying to manually control the exposure of my camera, but the setting is only briefly active, but then apparently still an auto mode seems to be active, as I can see on the camera images. My ...

Backstory: One livestreaming site I use isn't smart enough to detect the capabilities of my webcam (Logitech Brio, 4k), and instead just uses the default frames per second settings, which is 5fps. ...

I'm working on a video capture script for Python in Raspbian (Raspberry Pi 2) and I'm having trouble using the Python bindings for v4l2, since I have no success on memory-maping the buffers. What ...

I am trying to simultaneously stream the images from 3 Logitech Webcam Pro 900 devices using OpenCV 2.1 on Ubuntu 11.10. The uvcvideo driver gets loaded for these. Capturing two devices works fine...

I'm capturing a video by means of an USB Terratec Grabster AV350 (which is based on the em2860 chip). I don't succeed to get the audio when it is played . If I play the captured video with vlc or ...

I want to use my DSLR camera as video input for let say Skype / Google talk under Linux and Android. Is it possible to create a video loop back using v4l2loopback and Canon EDSDK ? how can I pipe ...

I'm trying to capture H264 stream from locally installed Logitech C920 camera from /dev/video0 with Gstreamer 1.0 v4l2src element. v4l2-ctl --list-formats shows that camera is capable to give H264...

I'm using an Aptina MT9V024 sensor connected via LVDS to the CSI interface of an i.MX6 Quad. I'm running the sensor in snapshot mode, i.e. using an external signal to trigger/start the image captur...

I'm working on a v4l2 API for capturing images from a raw sensor on embedded platform. My capture routine is related to the example on [1]. The proposed method for streaming is using mmaped buffers...

I am using OpenCV 2.4.5 on Ubuntu 12.04 64-bit. I would like to be able to set the resolution of the input from my Logitech C310 webcam. The camera supports up to 1280x960 at 30fps, and I am able t...

I am using 3 webcams to occasionally take snapshots in OpenCV. They are connected to the same usb bus, which does not allow for all 3 connections at the same time due to usb bandwidth limitations (...

I was recording something with vlc off v4l2 (in case that makes a difference), and I just selected the first format that worked, being mpeg2 using TS container. File resulted in .ts extension, as a...

I wanted to know if I can use "opencv" to write on a v4l2 device. I would take a picture, apply small changes with the features of opencv, and then send it on a v4l2 device. I searched on the web,...

I need to play multiple video for test a video server. I'm using lubuntu 14.04 and have installed V4l2loopback to make the device file ( /dev/videoN ) I am using mplayer to play video from this de...

The openCV code below grabs simultaneous images from two cameras. It works fine in windows, with the cameras both attached to one usb 2.0 hub. When I try the same code in linux, it only has enough ...