Thread: How many TV tuner cards

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  1. Default How many TV tuner cards #1
    antrisch is offline MythTV Rookie
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    How many TV tuner cards can I have in the same computer? (Myth backend)
    of course it is the amount of PCI slots on the motherboard that sets the limit but is it something else that could limit it CPU, ram, PCI-bandwidth etc…

    I want to receive DVB signals (live in Europe) and thinking of having
    2 DVB-T Cards
    1 DVB-C Card
    1 DVB-S Card

    Would that be possible? If so what would the minimum specs be?

    This is what I considering buying.

    MSI K8N NEO4 Platinum, nForce4 Ultra (4 pci)
    AMD Venice-core 3200 Or AMD 64x2
    Corsair TWINX2048-3200C2 DDR-DIMM 2048MB Kit
    4x Hitachi T7K250 250Gb SATA-2

    would it make it?

    And the last question:
    How will it be when we will be able to receive HD I 2-3 years just switch the DVB cards ?
    I read that it has high minimum requirements but that was for MCE how is it with myth?
    Will that system be able to handle 0? 1? 2? Or 3? Streams of 1080p

    /@

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  2. Default #2
    justinh is offline Cornerstone of the Community
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    PCI bandwidth is likely to be the biggest blocker, but even a full DVB-T multiplex is only a maximum of 15megabits/sec.
    You could probably run all those cards without needing a 2GHz CPU. The more RAM you have the better though (up to a certain point).

    I used to run an 800mhz athlon with 256MB and 2 DVB-T tuners (as a backend system) - recording from both at the same time wasn't a problem for it Cpu usage was still well below 10%, and it hardly ever used its swapfile! Its IDE bus was only ATA33, so watching a recorded show & recording 2 at the same time taxed it a little.

    As far as HDTV is concerned you don't need lots of CPU power to record or serve it.. only for viewing it! I keep saying this, but I don't think anyone believes me.

    And when HDTV finally reaches you, you may not even have to upgrade your cards (depending on the transmission method the broadcasters decide to use).

    one 1080p stream is typically around 15mbits/sec bitrate, so let's do the sums...

    For 3 1080p streams...

    15mb x 3 = 45mbits/sec = say 6MB/sec
    PCI bus is 32 bits at a minimum of 33mhz... that's about 133MB/sec... more than enough to spare, even taking extra unforseen overheads into account.


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  3. Default #3
    antrisch is offline MythTV Rookie
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    Ok thx I guessed it would be the PCI but wasn’t sure because it tends to be the bottleneck most of the times... hence the development of the Pcie

    I just found this page
    http://www.linuxis.us/linux/media/ho...our_needs.html
    ……………………………………………………
    For HDTV recording (Backend):
    CPU with atleast a 200mhz FSB (typicall 1.0Ghz or faster if you want to do a *lot* of transcoding)
    300GB is okay for starters, 1TB+ is helpful (up to 9GB/hr for HDTV, average of 5GB/hr, but you can transcode down to as far as .5GB/hr if you have don't mind loosing a lot of quality)
    Any video card
    256MB Ram (512MB if you have 3+ HD tuner cards)
    HD input hardware (pcHDTV HD Tuner, Set top box with firewire out & that's hackable -- HD tuners require only IO, no CPU to save recordings)
    100Mbit Network card
    …………………………………………………………………

    It seams to that the author says the same as you... if it isn’t you ;P

    The reason for the high specs is that I want to use it as a complete media server ( HDTV (and/or TV), DVD, Music, Photo Gallery, Web pages (php), Ftp server) and also form the beginning use as an frontend/backend combo

    So I guess with the low specs/demands for recording DVB streams / HD-streams that system will be way more than enough for that !!!

    And also enough for recording DVB streams / HD-streams combined with the media server features mention above could you/or someone just confirm that ?

    Thx again for your quick response
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  4. Default #4
    justinh is offline Cornerstone of the Community
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    Well, if you're only going to be using it as a frontend for SDTV, 1-2GHz should be more than enough (not that you can buy CPUs that slow these days lol).

    I served mythweb, mp3s and videos from my backend machine when it was just 800mhz - so it's not as if you need a lot of CPU grunt to do that either

    One thing which will help is:
    lots and lots of HDD space and a fast network card. 100mbit is fast enough for most things - and easily fast enough to stream HDTV in the future.

    As for your 'any' video card choice ... that's fine as long as it's at least a Nvidia (not ATI) FX5200.


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