[linux-dvb] networked digital tuner project

Brian Kuschak bkuschak at yahoo.com
Thu Jun 23 01:16:56 CEST 2005


> The thing about DVB over LAN is that you can place
> the tuner somewhere
> and watch the Streams somewhere else. This is what i
> want to do and I
> would only need one tune for it, but a PCI Card
> won't work.
> If someone needs to record n Transport Streams
> he/she needs n tuners.
> With One tuner per module he/she needs n modules and
> gets 100% efficiency.
> With 4 tuners per module he/she would need n/4
> modules. With n = 5 this
> would waste 3 tuners.
> Besides Modules with one tuner should be cheaper in
> production even more
> if you sell more of them. 5,000 people needing 4
> tuners are either
> 20,000 modules with one tuner or 1,000 modules with
> 4 tuners per module.

You want to use this for watching one stream at a
time, which is fine.  To support PIP you need an
additional tuner.  For interesting enhanced-PVR
capabilities and background recording, the more tuners
the better.  If designed right, a board which can
support up to 5 tuners can easily be manufactured with
a single tuner for cost concerns, by not stuffing the
additional parts, and choosing a pin-compatible FPGA
with lower gate count.  One board = multiple products.

As far as bandwidth goes, a single SD stream will
consume well below 10 mbps, and will coexist just fine
with other network traffic.  If you plan to watch two
HD streams simultaneously and record two others in the
background, you probably will want to use a dedicated
LAN, or aggregate the traffic onto a gig-e switch.


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