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-   -   TV Tuner - Working, audio razzy, v4lctl will not change channels correctly,... (https://www.linuxquestions.org/questions/linux-hardware-18/tv-tuner-working-audio-razzy-v4lctl-will-not-change-channels-correctly-811822/)

mitchell7man 06-02-2010 09:08 PM
TV Tuner - Working, audio razzy, v4lctl will not change channels correctly,...
 
Ok so I have my AVERTV M150-D TV Tuner working on the computer, however sound is screwed up, its really deep when people are talking.

I'm following instructions from here:
http://www.mythtv.org/wiki/AVerMedia_M150-D

It suggests using a script similar to:
Code:
#!/bin/bash
/usr/bin/v4lctl -c /dev/video2 setchannel $1
/usr/bin/v4lctl -c /dev/video2 volume mute off
/usr/bin/v4lctl -c /dev/video2 setfreqtab us-cable
/usr/bin/v4lctl -c /dev/video2 setnorm NTSC-M
sleep 1
(I have tried the same one he uses as well)

And find that it does not change channels and goes all fuzzy, sound fuzzy as well.

On this box, I also have a Hauppauge card, when I try to use v4lctl to change the channels on that card, I get the same result. So I think, its got to be something wrong with v4lctl.

Also, if you can think of another way to solve this issue, that would be awesome too.

I don't know what to do, any help is REALLY appreciated!

lugoteehalt 06-04-2010 02:29 PM
Quote:
Originally Posted by mitchell7man (Post 3990733)
sound is screwed up, its really deep when people are talking.
Is the speach being sent to the subwoofer - if you have surround sound?

Doubt if that is the problem but if it is I fixed that and can look up my notes if you want.

EDIT: Thinking about it: my problem was that when using surround sound the front centre and subwoofer channels were swapped over. Television is stereo presumably, so it is not obvious that you would get that problem.

mitchell7man 06-08-2010 09:50 PM
That isn't the problem, this system has two tuners, the first sounds fine, also recordings sound wrong on whatever computer they are to be played on. Thanks for the suggestion though.

Electro 06-09-2010 12:25 AM
Install the ivtv utilities. Do not use v4lctl. Use v4l2-ctl for better control. v4lctl does not work with Video4Linux version 2 and the ivtv modules are Video4Linux version 2 based.

I am not sure what you meant about razzy.

I have a Hauppauge PVR-250 and I do not have the problem you are having. I suggest check the firmware to make sure you are using the firmware that is compatible with the ivtv module version. You may have to extract the firmware that came with your card. This firmware comes with the Windows driver.

Make sure the card is not over heating because this can cause it to have type of problems.

Any video capture that I have always shows noisy or snowy channels and this is just through cable. If any of my video capture are connected from the VCR with Composite, quality is fine. I recommend use a VCR or similar device to record or watch TV. This is not the limitations of Linux. This is the limitations of analog video capture internal cards.

lugoteehalt 06-09-2010 11:56 AM
Quote:
Originally Posted by Electro (Post 3997391)
Any video capture that I have always shows noisy or snowy channels and this is just through cable. If any of my video capture are connected from the VCR with Composite, quality is fine. I recommend use a VCR or similar device to record or watch TV. This is not the limitations of Linux. This is the limitations of analog video capture internal cards.
Svideo cable is fairly cheep and gives a marked improvement of picture quality over composite with me. Agree about using VCR.

Electro 06-09-2010 06:35 PM
Quote:
Originally Posted by lugoteehalt (Post 3998014)
Svideo cable is fairly cheep and gives a marked improvement of picture quality over composite with me. Agree about using VCR.
Most VCR that are sold in the US comes with Composite. If I can find a VCR that has S-Video, I would buy it and use it. Sure there are combo units that combine DVD and VCR, but I prefer separates to ease replacing. Dah, S-Video is better.


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