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Old 04-18-2009, 05:12 PM   #1
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low-level set the freq for a tv-tuner card.

Hi, first of all. this is not a "problem". it is more like a question...

i have allways used mplayer (mencoder) on my server with a hauppauge HVR 4000 card. that works great. the thing is, now im bored of mencoder, and i want to "swim" deeper into the system...(xD)

i have understand it that when i do a:

mplayer tv://300 (example frequency)

- Mplayer - sets the frequency on the card... how does it do that??

i used to use this command to watch tv streamed from my server:

mencoder tv://SE11 -o >( nc x.x.x.x 1024 )

that will stream the video to a box on port 1024


im not english so sorry for my bad language.

the point is; i want to know how to manually set the channel for the card, if i just do a:

cat /dev/video0

i get an input/output error

as far as i know this is because i havet tuned into a channel.

so if anybody knows howto i can just do something like this to set a channel:

printf "<somebinary>">/dev/video0

or something like that to set the channel, so i can get the video stream from /dev/video0 it would be great.

this is my first post here, and belive me, i have googled.
Old 04-19-2009, 10:47 AM   #2
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Take a look at V4L2 drivers and how it works, I don't think you can read/write the video device pseudo-file directly. But maybe V4L2 exports some functionalities through the /sys/class" interface where you'll be able to read/write into fakes files to change some parameters without using a "true" programming language.
Old 04-19-2009, 11:30 AM   #3
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Thanks for replying, much appreciated.

why didn't i think of that (the /sys folder)

im going to check it out.

again, Thanks!
Old 05-29-2009, 10:20 AM   #4
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After alot of searching both on google and in /sys and even in /proc/sys, i can't find anything that would look like the files im looking for. I can't even find the video4linux documentation on this. im so tired of using mplayer, and i really want to learn how to do this so i can stream with http and stuff like that. dosent anybody know video4linux inn deep?
Old 05-29-2009, 10:38 AM   #5
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Is v4lctl any good?
Old 05-29-2009, 01:36 PM   #6
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Originally Posted by lugoteehalt View Post
Is v4lctl any good?
I have that installed, yet then im tuning inn and setting the norm with

v4lctl setchannel and setnorm

I can't grab it from /dev/video0

Thanks for your answer!


tuner, tv, v4l, video

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