[mythtv-users] HDHomeRun Quatro: any bandwidth issues?

[Greg Oliver]

On Thu, May 3, 2018 at 6:52 AM, Craig Treleaven <ctreleaven at cogeco.ca>
wrote:

>
> > On May 3, 2018, at 6:26 AM, Stephen Worthington <
> stephen_agent at jsw.gen.nz> wrote:
> >
> > On Wed, 2 May 2018 23:56:42 -0500, you wrote:
> >
> >> On Wed, May 2, 2018 at 10:32 PM, Marco Nelissen <
> marco.nelissen at gmail.com>
> >> wrote:
> >>
> >>> The HDHomeRun Quatro has 4 ATSC tuners, but only a 100Mbit network
> port.
> >>> In theory that should be enough, but is it, in practice? Anyone ever
> run
> >>> into any network bandwidth issues with the Quatro? Would I be better
> off
> >>> getting two dual-tuner models, to spread the load? (the tuner(s) would
> be
> >>> connected to a gigabit switch, and the rest of my network is all
> gigabit)
> >>>
> >>>
> >>> ?Don't see why it would be an issue..  21Mb/s is max on ATSC 1080i..
> >> That's 84 total.
> >>
> >> -Greg?
> >
> > If multrec is supported with HDHRs, then 100 Mbit/s will not be
> > adequate.  Worst case with multirec you can be downloading all the
> > channels from each multiplex, all at the same time.  I am not sure
> > what the full bandwidth of an ATSC multiplex is, but more than two of
> > them at once will certainly be more than 100 Mbit/s.  I can see why
> > the original HDHRs were 100 Mbit/s, but I find it incredibly stupid
> > for them to still be making new ones that are only 100 Mbit/s.  And
> > quite insane when they have four tuners.
>
> Sorry, but you are completely wrong.  An ATSC transport stream carries up
> to 19.39 megabits of data per second.  If there are multiple programs in
> the stream, they have to carve up that bandwidth.   See:
>

​Add your IP and UDP packet overheads and get back to me :)  I rounded up
to 21 for the example, but it is over 20 definitely.​



> https://en.wikipedia.org/wiki/ATSC_standards#MPEG-2
>
> A 100/Mbits per second ethernet link is quite adequate.
>
> Craig
> Seriously, did you think the SiliconDust guys couldn’t figure this out?
> Sheesh.
>
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