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0
votes
1answer
30 views

Video for Linux (V4L) generator driver

I would like to experiment with tvheadend but prior to investing in an actual capture card I was wondering if V4L supports a "generate" capture "card" that can just offer video stream of an image or ...
0
votes
0answers
101 views

Logitech Webcam constantly disconnecting/reconnecting, causing errors in Fedora

I have been having some issues accessing a webcam from my machine. Sometimes (not always) when I run a program that accesses the device (cheese, guvcview, and code using openCV), I get either of two ...
2
votes
0answers
748 views

Alternatives to Video4Linux2 for grabbing from webcam (Using FFmpeg)

I'm getting (two alternating) errors following this guide for streaming from a Raspberry Pi. Are there any other grabbers besides V4L2 that I can use with ffmpeg? Or are there any other streaming ...
2
votes
0answers
427 views

Analog Tv Tuner drivers for ubuntu

I was searching for the Analog usb (stick) tv tuner card for Ubuntu, but I have not found single such tv tuner card with ubuntu drivers available. I tried to search for the open source tv tuner ...
0
votes
2answers
908 views

v4l2 issues with webcam encoded to H.264

I am trying to send a H.264 webcam video feed over wifi to another computer using gstreamer. I am using this tutorial as a guide. I am using a Creative Live! Cam Connect HD as my webcam. The website ...
2
votes
0answers
295 views

No permission to access webcam on linux

I am using a raspberry pi with raspbian to capture webcam shots and upload them to a web server. However, when I rebooted just now I no longer have access to the webcam. I have no idea why this ...
2
votes
2answers
765 views

How Video4Linux and ALSA work with Codecs

My understanding is that a codec is both a decoder and a specification for decoding. So some group writes a codec which explains how to decode from their format back into the raw bitstream, and they ...
2
votes
1answer
174 views

V4L2 and ALSA: Kernel SPI or User API?

I'm trying to understand what Video for linux and ALSA are (exactly), and I can't discern whether they're APIs for Linux application to use (the userspace) or if they are backend services that are ...
2
votes
1answer
6k views

ffmpeg open webcam using YUYV but i want MJPEG

I need ffmpeg to open webcam (logitech c910) in MJPEG mode, because the webcam can give ~24 using MJPEG "protocol" and only ~10 fps using the YUYV. Can i choose between them using ffmpeg command line? ...
0
votes
1answer
582 views

Devices renamed with udev not working, original device node still there

I'm trying to rename certain video devices using udev. Here's a rule (broken down for readability): ACTION=="add", SUBSYSTEM=="usb", ATTR{busnum}=="1", ATTR{devpath}=="2", ATTR{idVendor}=="05e1", ...
0
votes
2answers
69 views

Camera's in Linux switch filename on boot

I've got a few camera's for use in Zoneminder. But they tend to switch places upon boot. One tiem camera a will get /dev/video0, the other time it will be /dev/video1. Is there a way to set these ...
2
votes
1answer
767 views

Linux (v4l) webcam - make settings “stick”

My Logitech camera (C300) is properly detected and present at /dev/video0. However, by default the image has contrast and saturation set to maximum, which significantly degrades the image quality. I ...
1
vote
1answer
604 views

Why can’t two programs access my webcam simultaneously?

I first launch cheese and my webcam turns on. I then run vlc to grab the output of /dev/video0 but it fails with: [0x7f3ea40012e8] v4l2 demux error: cannot set input 0: Device or resource busy ...
0
votes
1answer
498 views

v4l - capture and watch at the same time

Capturing v4l and line-in audio using mencoder works very well, but I would like to record real-time game play video from consoles plugged into the video card. I've used xawtv for this (Works quite ...
3
votes
0answers
1k views

Webcam resolution, vlc and Linux

I'm trying to do some some streaming with a webcam, but so far the results are not good: everything I stream in 320x240 looks good, but as soon as I choose a higher resolution, the image quality gets ...
0
votes
0answers
309 views

A way to stream from a v4l2 device?

I have a Arch Linux server and I'm currently using the mjpeg format to stream a security camera. The problem is that mjpeg is a bad format in terms of compression. It compress frames individually so ...
0
votes
1answer
162 views

VideoLAN device addressing in VLC

How do I get the VideoLAN device information that corresponds with /dev/video, and /dev/video1 for vlc targetting? This command kind of does what I want: vlc v4l2:// -vvv input_stream ...