Mailing List Archive: MythTV: Users

VMWare and MythTV

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ccmail at bellsouth

Feb 8, 2006, 12:38 PM

Post #26 of 35 (3594 views)
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Re: VMWare and MythTV [In reply to]

> Here is advice I offer to people trying to run wireless frontends who
> *refuse* to run an ethernet cable to said machine:
> - don't waste your time with anything slower than 802.11g
> - make sure your wireless driver is *WELL SUPPORTED*
> - make sure your signal strength is *EXCELLENT*
> - reduce your recording quality settings *WAY DOWN* so that
> recordings and livetv use less than 1gb/hour
> - adjust time stretch down until stuttering stops to help you
> figure out how much more you need to reduce recording quality
> for regular playback (or get used to watching recordings
> veerryy sllooww)
> - transcode your recordings to lower quality and bitrate
> before you attempt to watch them over wireless
> - use MythStreamTV to stream low(er) quality bitrate streams
> to a wireless machine and just use any old media player
> - after much frustration... give up and run an ethernet cable.

I also have to strongly disagree with the above. I didn't have to do any of
those things to achieve flawless stutter-free playback via 802.11g. The
only thing I had to do was to configure the Linksys wireless router (which
serves as the access point) to force it to use a bit rate less than the
default 54 MB/sec maximum. MythTV can't tolerate the time it takes to do a
TCP retry/resend if a packet gets dropped or corrupted in transit. Limiting
the maximum data rate to something lower (I think I use 36 MB/sec at home --
plenty fast enough for transmitting video) eliminates dropped/corrupted
packets.

Chuck

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david.whyte at gmail

Feb 8, 2006, 1:32 PM

Post #27 of 35 (3574 views)
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Re: VMWare and MythTV [In reply to]

On 2/9/06, Charles H. Chapman <ccmail [at] bellsouth> wrote:
> I also have to strongly disagree with the above. I didn't have to do any of

I agree the earlier comment that you just shouldn't try it. I am in
AU with gyprock walls as thin as paper, and a fairly decent wireless
range otherwise, but mythTV over wifi does suck.

All you guys that have success, are you running pure MPEG2 recordings
over the WiFi as that is what I have.

Whytey

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--

I have GMail invites, if you want one, email me direct.
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greg at gregandeva

Feb 8, 2006, 1:52 PM

Post #28 of 35 (3590 views)
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Re: VMWare and MythTV [In reply to]

On Thu, 2006-02-09 at 07:32 +1000, David Whyte wrote:

> All you guys that have success, are you running pure MPEG2 recordings
> over the WiFi as that is what I have.

Yes. As recorded by a PVR-500. But it also works fine with recordings
that get transcoded to MPEG-4.

--Greg

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ben_dash at yahoo

Feb 8, 2006, 1:55 PM

Post #29 of 35 (3583 views)
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Re: VMWare and MythTV [In reply to]

You need a pretty good signal on the wifi though as
when I used iptraf I saw that it was >5Mbps worth of
bandwidth.

--- Greg Woods <greg [at] gregandeva> wrote:

> On Thu, 2006-02-09 at 07:32 +1000, David Whyte
> wrote:
>
> > All you guys that have success, are you running
> pure MPEG2 recordings
> > over the WiFi as that is what I have.
>
> Yes. As recorded by a PVR-500. But it also works
> fine with recordings
> that get transcoded to MPEG-4.
>
> --Greg
>
>
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> mythtv-users [at] mythtv
>
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>

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mythtv at lost

Feb 8, 2006, 2:06 PM

Post #30 of 35 (3596 views)
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Re: VMWare and MythTV [In reply to]

On Wed, 8 Feb 2006, Greg Woods wrote:

> On Thu, 2006-02-09 at 07:32 +1000, David Whyte wrote:
>
> > All you guys that have success, are you running pure MPEG2 recordings
> > over the WiFi as that is what I have.
>
> Yes. As recorded by a PVR-500. But it also works fine with recordings
> that get transcoded to MPEG-4.

I used Intel Centroino 2200BG before and had some minor problems. Today
replaced it with atheros and MPEG-2 plays from PVR-500 like a charm :-) AP
is Linksys with OpenWRT WR4 I think.

---
Cougar
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ccmail at bellsouth

Feb 8, 2006, 2:09 PM

Post #31 of 35 (3628 views)
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Re: VMWare and MythTV [In reply to]

> I agree the earlier comment that you just shouldn't try it. I am in
> AU with gyprock walls as thin as paper, and a fairly decent wireless
> range otherwise, but mythTV over wifi does suck.
>
> All you guys that have success, are you running pure MPEG2 recordings
> over the WiFi as that is what I have.

Yep, plain old MPEG2 (what the PVR-250 spits out) and I did not have to
decrease the bit rate or quality of the capture. Like I said, most
applications can tolerate latentcy due to TCP retries but video transmission
can't. Drop the wireless bit rate to the point where retransmissions are
never needed and you should be all set.

Chuck

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ffrr at tpg

Feb 9, 2006, 4:26 AM

Post #32 of 35 (3613 views)
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Re: VMWare and MythTV [In reply to]

Robert Johnston wrote:

>You don't even need to do that. Grab one of the images from the VMWare
>site (One of the smaller ones), and edit the .vmx file. You can make
>as many, customizable, copies as you like, too.
>
>Alternatively, you could just grab the VMWare Server Beta, which is
>also free (Though registration for a "Licence key" is required) and
>has all the tools needed to create new Virtual Machines.
>--
>Robert "Anaerin" Johnston
>_______________________________________________
>
>

Also, I discovered some scripts (for Windows) that will create hard
disks and vmx files in answer to a few questions

http://www.sanbarrow.com/
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dwessely at wessely

Nov 4, 2006, 10:21 AM

Post #33 of 35 (3181 views)
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Re: VMWare and MythTV [In reply to]

Charles H. Chapman wrote:
>> I agree the earlier comment that you just shouldn't try it. I am in
>> AU with gyprock walls as thin as paper, and a fairly decent wireless
>> range otherwise, but mythTV over wifi does suck.
>>
>> All you guys that have success, are you running pure MPEG2 recordings
>> over the WiFi as that is what I have.
>>
>
> Yep, plain old MPEG2 (what the PVR-250 spits out) and I did not have to
> decrease the bit rate or quality of the capture. Like I said, most
> applications can tolerate latentcy due to TCP retries but video transmission
> can't. Drop the wireless bit rate to the point where retransmissions are
> never needed and you should be all set.
>
> Chuck
>
>
>
> _______________________________________________
> mythtv-users mailing list
> mythtv-users [at] mythtv
> http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users
>
I have had good luck running a mythfrontend on a VM. I have done a
basic install on Fedora FC5 and then followed the Howto at www.wilsonet.com.

My mythfrontend works great for a while and then stops loading, or it
loads real slow.

Does anyone have any ideas what up with the app just refusing to load?

I have had the same issues on different hardware. It looks like
something happens to the VM but everything else on the VM still seems to
work normally. This is the second VM I have built that has done the
same thing. It's odd.

Thanks

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cmisipster at gmail

Nov 4, 2006, 11:53 PM

Post #34 of 35 (3186 views)
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Re: VMWare and MythTV [In reply to]

Another thing to consider when running mythfrontend thru a wireless
connection is that you want the backend server connected by wired ethernet
to the wireless router. All the mythfrontends can then connect wirelessly.
This is because you effectively halve your wireless bandwidth if you have
frontends and backends communicate wirelessly through a router.

On 11/4/06, Darren Wessely <dwessely [at] wessely> wrote:
>
> Charles H. Chapman wrote:
> >> I agree the earlier comment that you just shouldn't try it. I am in
> >> AU with gyprock walls as thin as paper, and a fairly decent wireless
> >> range otherwise, but mythTV over wifi does suck.
> >>
> >> All you guys that have success, are you running pure MPEG2 recordings
> >> over the WiFi as that is what I have.
> >>
> >
> > Yep, plain old MPEG2 (what the PVR-250 spits out) and I did not have to
> > decrease the bit rate or quality of the capture. Like I said, most
> > applications can tolerate latentcy due to TCP retries but video
> transmission
> > can't. Drop the wireless bit rate to the point where retransmissions
> are
> > never needed and you should be all set.
> >
> > Chuck
> >
> >
> >
> > _______________________________________________
> > mythtv-users mailing list
> > mythtv-users [at] mythtv
> > http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users
> >
> I have had good luck running a mythfrontend on a VM. I have done a
> basic install on Fedora FC5 and then followed the Howto at
> www.wilsonet.com.
>
> My mythfrontend works great for a while and then stops loading, or it
> loads real slow.
>
> Does anyone have any ideas what up with the app just refusing to load?
>
> I have had the same issues on different hardware. It looks like
> something happens to the VM but everything else on the VM still seems to
> work normally. This is the second VM I have built that has done the
> same thing. It's odd.
>
> Thanks
>
>
> _______________________________________________
> mythtv-users mailing list
> mythtv-users [at] mythtv
> http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users
>

gull at gull

Nov 5, 2006, 1:44 PM

Post #35 of 35 (3187 views)
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Re: VMWare and MythTV [In reply to]

Chris Isip wrote:
> Another thing to consider when running mythfrontend thru a wireless
> connection is that you want the backend server connected by wired
> ethernet to the wireless router. All the mythfrontends can then connect
> wirelessly. This is because you effectively halve your wireless
> bandwidth if you have frontends and backends communicate wirelessly
> through a router.

Also, don't mix 802.11b and 802.11g devices if bandwidth is important.
Because the 802.11b frames take so much longer to transmit, they
dramatically reduce the amount of bandwidth available to the 802.11g
clients.

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