Why can’t two programs access my webcam simultaneously?
- by qdii
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
[0x7f3ea40012e8] v4l2 demux error: cannot set input 0: Device or resource busy
[0x7f3ea4002168] v4l2 access error: cannot set input 0: Device or resource busy
[0x7f3ea4002168] v4l2 access error: cannot set input 0: Device or resource busy
[0x7f3eb4000b78] main input error: open of `v4l2:///dev/video0' failed
Whatever pair of video programs I run (skype, cheese, vlc, etc.), the result is always the same: the second program can no longer use the webcam when the first one has already grabbed the output.
However I find it curious as video4linux states:
In general, V4L2 devices can be opened more than once. When this is
supported by the driver, users can for example start a "panel"
application to change controls like brightness or audio volume, while
another application captures video and audio.
My webcam is seen in lspci as 058f:a014 Alcor Micro Corp. Asus Integrated Webcam, but I don’t even know what the underlying driver is, so I can’t check whether my problem is driver-related or not. Any input would be more than welcome!
