Questions tagged [v4l2]

v4L2 is the second version of Video4Linux, a collection of device drivers and an API for supporting realtime video capture.

16 questions with no upvoted or accepted answers
Filter by
Sorted by
Tagged with
3
votes
0answers
217 views

Trying to use cec-compliance fails with open on /dev/cec0

I'm trying to use the hdmi cec tools that come with the latest Raspian. When I try and run cec-ctl or cec-compliance I get a fail to open /dev/cec0. The kernel modules I have from lsmod (partial): ...
2
votes
0answers
470 views

Jessie: v4l2 streaming works with RPi 1B+, but not with 2B or 3B

I just recently upgraded my series of Pi's (1B+, 2B, 3B) to Raspbian Jessie Lite. Now, when I try to setup a stream with my Pi NoIR Camera as I did in Wheezy, sudo modprobe bcm2835-v4l2 cvlc v4l2:///...
1
vote
0answers
136 views

USB camera pipe error after a while

We have RPi3B+ with Raspbian Lite installed, 2.5A power supply. We need to connect a specific USB camera (LEPTON PureThermal 2) and display its image. The connection with the camera works, it gives ...
1
vote
1answer
607 views

UV4L and v4l2rtspserver

I am trying to stream with uv4l over v4l2rtspserver This is what I do: Start /dev/video0 $ uv4l -nopreview --auto-video_nr --driver raspicam --encoding h264 [core] Trying to loading driver '...
1
vote
0answers
409 views

Streaming HLS from a video4linux2 virtual video device

I'm trying to accomplish a few things at the same time with the raspberry pi camera; create an HLS live stream take regular interval jpg snapshots and save them to disk irregularly record short ...
1
vote
0answers
1k views

/dev/video0 not created

I am having trouble getting a USB Camera to work with a Raspberry Pi 3 Model B. I cannot get /dev/video0 to be created. I have run sudo modprobe bcm2835-v4l2 and I can see bcm2835-v4l2 when I run ...
1
vote
0answers
691 views

Multiple webcams - cannot open in openCV & corrupted image

I've connected four USB webcams via well powered USB hub to RasPi2. I want to use them in openCV. So I setup a simple program, where I opened the cameras using cvCaptureFromCAM, captured a cv::Mat and ...
1
vote
0answers
510 views

avconv version 9.14 streaming video (using UV4L driver RaspiCam) and video (using ALSA) to ustream, no audio

I'm using avconv to read from /dev/video0 (which is attached to my RPi camera via UV4L) and also reading audio from my microphone using ALSA and stream it live on ustream.tv. It works just fine to ...
1
vote
1answer
1k views

Raspbian v4l2loopback

I'm trying to load v4l2 modules. Before doing that, I run: sudo apt-get install v4l2loopback-dkms but, when I load the module, I get an error: sudo modprobe v4l2loopback devices=4 modprobe: FATAL: ...
0
votes
0answers
39 views

Raspberry Pi Camera V2 resolution reduced

I am testing my Raspi Cam V2 on raspi model 4B running buster, I was able to get 1080p videos at 30fps and it supported the below formats $ ffmpeg -f v4l2 -list_formats all -i /dev/video0 [...
0
votes
0answers
45 views

video flickering while streaming with uvc-gadget and g_webcam on raspberry pi 3b+

I am using raspberry pi zero w emulated as a webcam using uvc-gadget. It works plug and play on Nvidia-jetson-nano, or any other pc or laptop. But I see too many choppy frames when I use it with my ...
0
votes
0answers
20 views

C920 cannot register after removing uv4l

I have a pi 3b+ running Raspbian stretch. c920 had been working out of box with the official v4l2 driver. I install UV4L to play with the webrtc features. But found some problems. So I did an apt ...
0
votes
0answers
385 views

Stream video from Raspberry Pi Zero with fixed frame rate, any latency

I'm looking for assistance with wirelessly streaming video from a (headless) Raspberry Pi Zero and pi NOIR v2 camera module. I'd like to collect data for a machine vision application with a fixed ...
0
votes
0answers
220 views

raspicam TCP video streaming over ssh - almost there… but need help

I am trying to pipe raspivid over ssh to my main computer, and then via gstreamer send the stream to a dummy video device (thanks to V4l2loopback) environment : v4l2loopback version: 0.12.0 kernel ...
0
votes
0answers
511 views

Configuring USB Webcam in Raspberry PI

I'm configuring Logitech C920 USB Webcam in Raspian for using it with a 3rd party application. I get the below error I tried to set exposure control using uvcdynctrl and guvcview as well. I'm able to ...
0
votes
0answers
1k views

v4l2 on RPi not working in avconv stream

I have been trying to run a webcam/audio stream from usb devices on my rpi. I have run the following commands: avconv -f video4linux2 -i /dev/video0 –s 640×360 r 10 –b 350k –f flv rtmp://x....