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Questions tagged [video4linux]

Video4Linux or V4L is a video capture application programming interface (API) for Linux, supporting many USB webcams, TV tuners, and other devices. Video4Linux is closely integrated with the Linux kernel.

Video4Linux or V4L is a video capture application programming interface (API) for Linux, supporting many USB webcams, TV tuners, and other devices. Video4Linux is closely integrated with the Linux kernel.

References

  1. Video4Linux - Wikipedia
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Video4Linux Y12 Pixel Format for use with OpenCV issues

I have a AMG88xx infrared camera attached to a raspberry PI 4 i am using the linux video-i2c driver the driver appears to work correctly v4l2-ctl -d /dev/video0 --all Driver Info: Driver name : video-i2c Card type :…
fireblade
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implenenting AMG8xx Infrared Camera Kernel Module and Video4Linux

I have found, and forked(https://github.com/firebladed/amg88xx-kernel-driver/blob/master/amg88xx.c), a kernel module for the AMG8xx(http://industrial.panasonic.com/cdbs/www-data/pdf/ADI8000/ADI8000C66.pdf) it currently outputs to /sys/ as a text…
fireblade
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OpenCV fails to recognize webcam, but mplayer succeeds

As a first step on a larger project I was trying to display the imagem from my webcam using OpenCV: #include #include …
afarah
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Converting raw video to mp4 on beaglebone with ffmpeg

I'd really appreciate help with this one. I am recording video via a webcam with my beaglebone black. The formats supported by the camera are shown below. v4l2-ctl --list-formats ioctl: VIDIOC_ENUM_FMT Index : 0 Type :…
Engineer999
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Installing video4linux Beaglebone

I'm working on Beaglebone black on a project on image processing. For this purpose, I shall need video4linux application. However, I'm not able to share my internet with the beaglebone because of which "sudo apt-get install v4l-utils" isn't…
diviquery
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Does a video have to be encoded before output on screen?

I've got a task to show video in console mode without X11, captured from a USB camera. I'm totally new to the video capturing/encoding/decoding stuff. I figured out that USB cameras supporting Video4linux can capture video in YUV 4:2:2 format. As…
Grigory
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How to capture h264 with ffmpeg

I'm trying to capture h264 with ffmpeg and send it to my virtual device. I can capture YUYV and send it with this command: ffmpeg -f video4linux2 -s 1920x1080 -i /dev/video0 -vcodec copy -f v4l2 /dev/video3 Then I tried this to capture h264 instead…
Tveitan
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How to wait for frame and alarm signal

I have problem with a webcam. It can be a hardware one but i'm convinced it is no. With all apps I can see the stream but suddenly it freezes. Because of the following output from used app when the problem occurs: v4l: timeout (got SIGALRM),…
Cecylia
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How to record webcam video signal with video4linux2?

I need to record a video from my webcam with ffmpeg. I tried with this command : ffmpeg -re -f video4linux2 -i /dev/video0 video.avi. And I received that : The v4l2 frame is 24384 bytes, but 153600 bytes are expected. When I try the same operation…
ShoxSpartan
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How to validate radio frequencies in a Linux radio device driver?

I know that an unsigned number can never be less than 0 and there is no need to test for it. But I want to avoid bogus frequencies for the tuner. /* freqKHz is in KHz (duh) */ void videoinput_set_tuner_freq( videoinput_t *vidin, int freqKHz ) { …
user1840007
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How do I configure vlc/ffplay/cheese (or other) to automatically cycle/rotate between my 3 webcams?

I have 3 webcams which register in Ubuntu 18.04 as /dev/video0, /dev/video1 and /dev/video2. All three show up fine in Cheese and ffplay (but not vlc for some reason... not important for this question). What I want is to open a viewing window and…
fivedogit
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