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2answers
2k 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 ...
0
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2answers
49 views

v4l2 Identifying /dev/video* via lsusb

I'm writing a script that must use a particular camera plugged in to my system. $ lsusb|grep C930e Bus 001 Device 011: ID 046d:0843 Logitech, Inc. Webcam C930e How can one programatically discover ...
4
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1answer
2k views

Poor image quality and high CPU usage while streaming in high resolution using webcam and VLC in 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
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1answer
101 views

No such input format: MJPEG

I want to convert my camera pixels format from YUYV to MJPEG. I tried to use v4l-utils but when i used this commend in terminal: ffmpeg -f video4linux2 -pixel_format MJPEG -i /dev/video0 but when I ...
2
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0answers
1k 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
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0answers
714 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 ...
2
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0answers
571 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 ...
0
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0answers
23 views

Trying to capture from 2 USB cameras with Gstreamer fails, but it works fine with VLC

Please excuse my clunky English. I need to capture video from 2 USB cameras at the same time, for a later use (computer vision related). I tried with the Gstreamer command line tool gst-launch like ...
0
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0answers
24 views

Video delay when using filters in ffmpeg

I try to make video of sport event using raspberry pi. Drawtext filter seems good option to write score on the video. I have problem with synchronization / delay of video. I can see changing points ...
0
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0answers
40 views

It it possible to change my web camera output format?

In my previous question about my USB webcams, I asked about changing the pixel format of the cameras in order to use them as a stereo camera. I was advised that isn't possible because the camera ...
0
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0answers
161 views

Capture audio (alsa) and video (v4l2) from usb capture card

I want to save my old videos using a USB capture card. I'm using V4L2 Test bench and I've got working video and audio. I've managed to capture both audio and video, but not a the same time (saving to ...
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0answers
2k views

How to know which framerate should I use to capture webcam with ffmpeg?

I'm capturing video from my webcam with the following command: ffmpeg -r 30 -f v4l2 -video_size 160x120 -i /dev/video0 output.avi The -r option indicate the framerate I want. However, it's not that ...
0
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0answers
377 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 ...