My GPX Personal TV went out this morning. I can still hear audio, but no video. I have always wondered if there was an application (For any OS) that could recieve video and audio and display it in a window. I already have a coaxial `connected` to a jack that can plug into my computer. It works as a makeshift antannae. I just want to know of an application that can recieve signals through a jack. Thanks.

Please define what you mean by jack. Does your computer have a tuner card of some sort? If so what is the make / model?

http://linuxtv.org/
http://www.linuxlinks.com/Software/Multimedia/TV/

I mean through my microphone jack.
I would like to use VLC, but I dont know what file my mic input goes to.

"GPX Personal TV" seems to be a common tv so it's input would be the type common in your locale. It may be ntsc,astc or pal or other. To get that type of input to show on a computer, you should need a type of tuner. There may be some other issues like how you receive signals. Are they from over the air (OTA) or from a pay service?

I assume that as a reference to the TV going out you want to use your computer for the same purpose. For that you need a TV tuner ether a PCI card or USB. The microphone input is only for audio and can not be used to decode TV or video signals.

If your TV has a video output you can use a video grabber in lieu of a TV tuner.

How would I get audio signals from my mic jack to VLC? What file is it located in?

you don't need to get audio signals from the mic port into vlc unless you are using vlc to record the stream, otherwise it should be just a matter of unmuting the mic and adjusting the volume in the mixer app.\

as for tv, you need a tuner card, which is specialized hardware, not usually expensive though
linux compatible internal cards can be had for as little as $40 US (cheaper than an actual TV)

But I would still like to know which file it is in.

that varies based on tuner models, usually it would be /dev/video0 though (the good tuners provide the video signal as an mpeg stream and don't require any audio in through the mic port, just the coax plugged into the tuner's input and the software tuned to the correct channel, probably via IVTV)

Video0 is my webcam. I dont want to use the internal mic, but rather pull the audio from my mic input.

like i said, if it's just a pure audio connection then just turning up the volume in the mixer should let you hear through the mic.
if you have an RF signal (as in a TV coax), than you need a tuner, no amount of this or that with the microphone port is going to get you anywhere.
perhaps you should explain in more detail what it is you are trying to do and how your setup is configured at present, it sounds to me like you have one of those F-connector to 3.5mm plug such as this one plugged into your mic port?
is this correct?

Not quite. It is hard to explain what I am doing. I will post pictures when I am able.

I have them.
Coaxial part
The jack pluged into my laptop.

The second link does not work. (It does now)

How does the COAX, webcam and mic audio tie together? As already stated if you actually explain what you are trying to accomplish we could provide some real help. What you posted in the picture will not work. The antenna signal and microphone input are not compatible.

i believe the op is trying to watch tv on his(her?)laptop

@maniakk
michaelk is right, what you are doing is never ever going to work

the coaxial cable carries an RF signal (a composite video signal piggybacked onto a radio frequency carrier wave)
first you need to select the correct carrier frequency and to do that requires a TUNER, then you need to separate the A/V signal from the carrier frequency, which is the job of a receiver, then of course there is the possibility that, depending on the source (cable box, video game console, vcr etc..) the signal is analog and has to be converted to digital.

This can ONLY be done by specialized hardware which is not present in your laptop (or any desktop unit for that matter), it is impossible for software to emulate this, since you have a laptop you would want to get a USB tuner card (tuner/receiver are both part of the same unit), which since your webcam is already occupying the device /dev/video0 would then be /dev/video1. (some media center PCs come with a tuner card, but most standard PCs do not)

you can try until you are blue in the face with your current setup, but it's not going to do anything other than risk damaging your computer with stray voltage from the coax line.

to make a long story short, as mentioned several times before, you need a TUNER card, which aren't horribly expensive.