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Old 02-01-2008, 12:05 AM   #1
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Talking TV Tuner software setup semi-Frame Relay?

I am setting up a media center PC for use by my roommates and I. We don't want to run RG6 right now but would still like TV access in our rooms. Would it be feasible, quality/delay limitations aside, to have one TV tuner card to broadcast different channels to separate sessions? (Sessions = over our LAN, which is why quality/delay limitations aren't that important right now. I know that no one would mind if the video was 800x600 but hopefully at least > 640x480 with a web interface.)

Specifically: Could a software program simulate an 'on-demand' Frame Relay type network (or even ATM) so that one tuner card could have multiple users watching different channels? The software would change the card's freq. to each channel, encode, broadcast, and move on; sampling a channel only when a user accesses the stream. Using PAL format, 25fps, a processor would more than satisfy Nyquist since the card has it's own clock for tuning/sampling. The software would, in the most simple breakdown, be changing the channel really fast...~50Hz/User.

Media PC -> User1 -> Sample1 -> User1+2 -> Sample1toUser1 -> Sample2toUser2 -> S1toU1 -> S2toU2 -> User1+2+3 -> S1toU1 -> S2toU2 -> S3toU3 and so forth....

I don't know where to look on a project page to see if it's source could be manipulated in such a manner. I also don't want to request a feature when I don't have much to add to the project. I have a great background in IT (co-oping at a major university's research division) and I'm really good with all levels of hardware from PLD's, analog circuit design, to Cisco (senior in Telecomm. Eng.) But, I will admit I'm not very good with programming above a VHDL/Assembly level--which is why I don't know if this would work. I would be happy with just getting a block/flow diagram of how typical tuner software works. I'm really big on "where there's a will there's a way" and enjoy challenges; give me a hint of hope and I'll give it a shot.

Plus with Linux I get to learn more, manipulate more, and it is much faster.

Any insight would be much appreciated!
Old 02-01-2008, 12:58 AM   #2
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Most tuners will only tune in one channel at a time and it usually takes about a second to tune.

You might look at the HdHomerun. It is a external dual tuner that runs over Ethernet. It is fully supported by mthytv or you can just watch the streams with something like VLC.

Last edited by lazlow; 02-01-2008 at 12:59 AM.


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