how do I restore /dev/video ???

jimdaworm · 06-09-2004, 09:57 AM

I was playing around and I managed to delete my /dev/video and /dev/video0 files (don´t ask me how) I need to get them back as this is what tvtime uses to acess my tv capture card.

How can I restore them?? I think one was only a simlink to the other but I can´t remember which it was.

Thanks
Adam

Astro · 06-09-2004, 11:12 AM

you can probably just run `touch /dev/video0` and the /dev/video will be the sym link to /dev/video0 so you can make that next.

jimdaworm · 06-09-2004, 11:50 AM

Thanks for the reply! I guess I was thinking it would be more complicated than that. I will get right back to you when I give it a go later. I am at work at the moment.

jimdaworm · 06-10-2004, 03:00 AM

It didn´t work, it looks like you have to create it in a special way

Quote:

videoinput: /dev/video0 is not a video4linux device.
deinterlace: AdaptiveSimple disabled: required CPU accelleration features unavailable.

Quote:

bash-2.05b# ls -l video0
-rwxr-xr-x 1 root root 0 Jun 10 09:53 video0
bash-2.05b#

Quote:

bash-2.05b# ls -l video
lrwxrwxrwx 1 root root 6 Jun 10 09:53 video -> video0
bash-2.05b#

Any more ideas??

synapse · 06-10-2004, 03:28 AM

Hi as root cd into /dev

there is a readme file which contains some documentation as to use, and run the script Makedev video ( i think video ? ),Ive tried this once before and it generally works. It will make all the video 0-whatever so you wont have to make each device.

cheers

jimdaworm · 06-10-2004, 04:56 AM

Hey synapse that was just what I needed, thanks a lot! Now I seem to have more video devices than I had before, but it works fine and I can see you can rebuild any device you might happend to delete from there!

BTW for any lazy people reading the command was MAKEDEV video (where I guess video could be any time of device)

Thanks again!

Astro · 06-10-2004, 04:13 PM

oh! ha
I forgot about the Makedev script, I knoew it was something like that.

me = out of practice... :P

jimdaworm · 06-10-2004, 04:30 PM

No worries, I do the same thing all the time!!!

rotvogel · 06-10-2004, 04:55 PM

You could manually copy the files missing from the Slackware package. The .tgz format is a normal tarball and copying individual files from that archive using mc is easy.

The official way is something like:

Code:

mknod /dev/video0 c 81 0 
ln -s /dev/video0 /dev/video

That should do it .

jimdaworm · 06-11-2004, 03:47 AM

Interesting, but I guess someone realised that is was a pain in the ass having to know/lookup all the major and minor numbers for devices that you wanted to create and hences MAKEDEV

I wander if one day I will understand these crazy major minor numbers properly!

rotvogel · 06-11-2004, 05:56 AM

There is not much to understand about major and minor device numbers. You can look those up in the Documentation directory in the kernel source. The file is called devices.txt.

jimdaworm · 06-11-2004, 08:08 AM

Wow thats amazing so much simpiler than I thought it would be!! I guess I should probably dig around and have more of a look at the documentation!

I wander if there is a reference to this in the wikis or howtos?? There should be if there isnt.

Thanks again

320mb · 06-11-2004, 08:21 AM

heh, that documentation directory is 5+ megs!! I've mentioned it
a few times in various posts..........there is ALOT of info there and
people should read thru it when installing/upgrading their kernel.........