How fast is the HMO multiroom option?

If I'm using a WirelessB USB Network connector to connect two tivos to my
home network, I'm curious how fast the multiroom feature is. If I were to
tape a show in one room and watch it in another, on another tivo, can I
start watching is right away or is there any lag to the transfer? Can
anyone who is using this option with WirelessB provide some insight?

Depends on the quality it was recorded at....

if it's basic quality, you can watch it real time (after an initial delay)

anything else, and you have to wait to buffer it a bit before you can watch
it.

Even at 100mb you can't watch the best quality real-time..


"RM" wrote in message
. net...
If I'm using a WirelessB USB Network connector to connect two tivos to my
home network, I'm curious how fast the multiroom feature is. If I were to
tape a show in one room and watch it in another, on another tivo, can I
start watching is right away or is there any lag to the transfer? Can
anyone who is using this option with WirelessB provide some insight?

On Wed, 08 Oct 2003 09:40:04 -0700, Chief Wiggum wrote:

Even at 100mb you can't watch the best quality real-time..

What about gigabit ethernet?

Oh wait, silly question...

USB 1 can't support gigabit ethernet speeds anyway, can it?

--
Lenroc

Stein Hals wrote:
I questioned the statement: "Even at 100Mbit/s you can't watch the best
quality real-time."

What about TiVos with the (100mb/s) Turbonet card?

While they might make it possible, it's a moot point. Any TiVo that can
host a Turbonet card can't run HMO.

Even if you hacked some HMO-like features onto a series one TiVo and
tried using a Turbonet, it's my understanding the results are less than
spectacular. From what I've read, the TiVo's CPU becomes bogged down
with transfers since, afaik, the Turbonet drivers don't support DMA.
That's probably changed though, it's been a long time since I've read
about that.

No, you were correct the first time. USB 1.1 has a (theoretical)
bandwith of 12Mbit/s, which still should be enough to play 5800 kb/s
real time.

Theoretical is right. In reality, USB 1.1 appears to be a bit slower
than what's required for 5800 kb/s. This matches various benchmarks, and
what TiVo users report when they try to watch a best quality recording.

FWIW, there's also apparently a non-negligible overhead for the
encryption that TiVo is using that adds to the bandwidth requirements.

--
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In article ,
said...
"Chief Wiggum" wrote:

Even at 100mb you can't watch the best quality real-time..

Why not? Is that a limitation in the HMO software?

100 Mbit/s ethernet should theoretically be able to display DVD-video real
time, with plenty of space to spare.

TiVo "Best quality" has a bitrate of 5800 kb/s (correct?), 100 Mbit
ethernet should theoretically be able to push through roughly 17 times
that. Even 10Mbit ethernet should be able to push through 5800 kb/s.

The problem is that Tivo is already busy recording and playing a show at
almost all times whether it's just the buffer or an actual scheduled
recording. Now you're talking about 2 reads and a write simultaneously.
The system probably can't keep up at that speed. I have a Replay and that
it capped at about 5mb/s when I rip shows from it so that it can keep up
recording and playing and even that makes it stutter from time to time.
It works better if I turn off the decoder since I'm not usually watching
anything when I'm ripping a show across my network.

"Lenroc" wrote
Even at 100mb you can't watch the best quality real-time..
What about gigabit ethernet?
Oh wait, silly question...
USB 1 can't support gigabit ethernet speeds anyway, can it?

Nope. 11Mbps max. (USB 2.0 has a 480Mbps theoretical max.
Compare that to Gigabit Ethernet at 1000Mbps theoretical max.)

On Wed, 08 Oct 2003 19:58:20 +0000, Stein Hals wrote:

My series one DirecTiVos can do 2 writes and one read simultaneously, so I
don't think that is the problem.

DirecTivos are different.

They also can't do HMO.

--
Lenroc

In article ,
said...
Lenroc wrote:

DirecTivos are different.

Not the point. The SA TiVo 2s should have no problem doing this. We are not
talking about encoding two shows here, just serving two different
datastreams to two different destinations, while simultaneously
writing/encoding one show. This is not (from a hard drive's point of view)
extreme amounts of data. If the network interface was better/faster, the
TiVo2 should have been able to do this with no problem whatsoever.

They also can't do HMO.

Sadly, that's true.

DirecTivos are never encoding anything. They only decode.

Bao H. Lammy wrote:

"Lenroc" wrote

Even at 100mb you can't watch the best quality real-time..

What about gigabit ethernet?
Oh wait, silly question...
USB 1 can't support gigabit ethernet speeds anyway, can it?


Nope. 11Mbps max. (USB 2.0 has a 480Mbps theoretical max.)

It's been in the news recently: a bunch of "USB 2.0" devices
on the market max out at 15 to 22Mbps. Very few devices
come close to the theoretical max.
-Joe

In article ,
said...
Bao H. Lammy wrote:

"Lenroc" wrote

Even at 100mb you can't watch the best quality real-time..

What about gigabit ethernet?
Oh wait, silly question...
USB 1 can't support gigabit ethernet speeds anyway, can it?


Nope. 11Mbps max. (USB 2.0 has a 480Mbps theoretical max.)

It's been in the news recently: a bunch of "USB 2.0" devices
on the market max out at 15 to 22Mbps. Very few devices
come close to the theoretical max.

That's usually the fault of the device and not the bus.