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johnnyjboss at gmail

Nov 20, 2009, 8:49 AM

Post #1 of 30 (1970 views)
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Video noise or distortion across very top edge of image

I've got the HD-PVR running on Component capture of a Motorola DCX3200
on a dedicated backend.

I've got a dedicated frontend using VDPAU and 0.22 compiled from source.

Channel 222 is CNN Headline News (love my Robin Meade). I am seeing
some sort of video noise or distortion across what seems to be the
very top pixel of my playback image. This happens in LiveTV and also
on Recording.

This morning I used the Shutdown-Menu on the Motorola DCX3200 to tell
the STB that my TV only handles 1080i and 720p which finally got me a
full screen image on my Samsung LCD Television. Now that Samsung is
connected to frontend using the VGA dsub. The max resolution on this
Tv is 1368x768 so I wasn't going to mess with the HDMI out on my
frontend's motherboard.

The motherboard is an ASUS with an onboard nVidia as follows from lspci:

02:00.0 VGA compatible controller: nVidia Corporation C77 [GeForce
8300] (rev a2)

VDPAU seems to be working ok out of the box - the distro is MythBuntu 9.10.

I tried adjusting the Vertical offset in the Setup-->Playback menu. I
moved it from 0 through 10 (trying each incrementally) and I wasn't
able to notice any difference. It does seem that each time I invoke
the LiveTv mode I may get a more or less dramatic experience of this
noise.

Does anyone know what this is and how to go about resolving it?
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travis at tabbal

Nov 20, 2009, 8:58 AM

Post #2 of 30 (1958 views)
Permalink

Re: Video noise or distortion across very top edge of image [In reply to]

On Fri, Nov 20, 2009 at 9:49 AM, Johnny Walker <johnnyjboss [at] gmail>wrote:

> I've got the HD-PVR running on Component capture of a Motorola DCX3200
> on a dedicated backend.
>
> I've got a dedicated frontend using VDPAU and 0.22 compiled from source.
>
> Channel 222 is CNN Headline News (love my Robin Meade). I am seeing
> some sort of video noise or distortion across what seems to be the
> very top pixel of my playback image. This happens in LiveTV and also
> on Recording.
>
> This morning I used the Shutdown-Menu on the Motorola DCX3200 to tell
> the STB that my TV only handles 1080i and 720p which finally got me a
> full screen image on my Samsung LCD Television. Now that Samsung is
> connected to frontend using the VGA dsub. The max resolution on this
> Tv is 1368x768 so I wasn't going to mess with the HDMI out on my
> frontend's motherboard.
>
> The motherboard is an ASUS with an onboard nVidia as follows from lspci:
>
> 02:00.0 VGA compatible controller: nVidia Corporation C77 [GeForce
> 8300] (rev a2)
>
> VDPAU seems to be working ok out of the box - the distro is MythBuntu 9.10.
>
> I tried adjusting the Vertical offset in the Setup-->Playback menu. I
> moved it from 0 through 10 (trying each incrementally) and I wasn't
> able to notice any difference. It does seem that each time I invoke
> the LiveTv mode I may get a more or less dramatic experience of this
> noise.
>
> Does anyone know what this is and how to go about resolving it?
>
>
Sounds like the Closed Caption data. You don't normally see it because of
overscan. Try the newest NVidia drivers and see if you can get it to
overscan the TV output just a little to get that row of pixels out of the
visible area of the screen. When using VDPAU, you can't use the scaling and
such built into Myth from what I've read on the list, so you need to use the
drivers to do it. Both of my systems overscan way to much by default, so I
use the "Overscan Compensation" in the Nvidia X setup utility to set it so
that I just just a little overscan, so I don't see that line but I can see
all of the image.

You might have more luck getting overscanning on HDMI as the VGA output
might not support it (it's not generally done on computer monitors). Modern
video cards like the 8300 work pretty much out of the box with HDMI. I
didn't do any setup to get it working on my machine other than making sure
the NVidia driver was installed. Even BIOS/POST show up over HDMI now. One
of my frontends uses an Asus M3N78 with the onboard 8300 chip. Works great
with HDMI. I'm not using HDMI audio, so I can't speak to that. That TV is
just using the TV speakers, so I used analog stereo out for it.

brian at interlinx

Nov 20, 2009, 8:59 AM

Post #3 of 30 (1978 views)
Permalink

Re: Video noise or distortion across very top edge of image [In reply to]

On Fri, 2009-11-20 at 10:49 -0600, Johnny Walker wrote:
>
> Channel 222 is CNN Headline News (love my Robin Meade). I am seeing
> some sort of video noise or distortion across what seems to be the
> very top pixel of my playback image. This happens in LiveTV and also
> on Recording.

Are you overscanning on playback or are you displaying every single
pixel of the captured picture inside your viewable area on the playback?

Hiding this sort of "edge distortion" is what overscan is for.

> I tried adjusting the Vertical offset in the Setup-->Playback menu. I
> moved it from 0 through 10 (trying each incrementally) and I wasn't
> able to notice any difference. It does seem that each time I invoke
> the LiveTv mode I may get a more or less dramatic experience of this
> noise.

Can you not make the video hardware do the overscanning? I do this with
my 5200FX, admittedly in a pure analog output stream. Maybe using VDPAU
restricts this video card driven overscanning?

I set up the overscanning on mine with nvidia-settings. I basically
tuned it until what I was seeing coming from Myth matched exactly what I
saw watching native television.

b.

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johnnyjboss at gmail

Nov 20, 2009, 9:09 AM

Post #4 of 30 (1954 views)
Permalink

Re: Video noise or distortion across very top edge of image [In reply to]

Oh that's great news about the HDMI not being a pain. My frontend is
actually an ASUS M3N78-EM motherboard so that's great.

I'm also familiar with nvidia-settings I've just never messed with overscan.

I'll try this when I get home.

I'm also seeing the following in the dmesg on the backend:

[ 128.035461] hdpvr 1-4:1.0: untested firmware version 0xf, the
driver might not work
[ 128.333099] hdpvr 1-4:1.0: device now attached to /dev/video0

I assumed I had the latest firmware since my HD-PVR purchase was 1
week ago. Message threads seem to indicate that this message appears
if your firmware is too recent. Does anyone know what version 0xf
equates to and if I need to find a Windows machine to upgrade the
firmware on my HD-PVR with? The only windows machine in my house my
partner's laptop running Vista. Is Vista even a supported OS for the
firmware update or do I need to temporarily load XP on a spare
machine?

On Fri, Nov 20, 2009 at 10:58 AM, Travis Tabbal <travis [at] tabbal> wrote:
>
>
> On Fri, Nov 20, 2009 at 9:49 AM, Johnny Walker <johnnyjboss [at] gmail>
> wrote:
>>
>> I've got the HD-PVR running on Component capture of a Motorola DCX3200
>> on a dedicated backend.
>>
>> I've got a dedicated frontend using VDPAU and 0.22 compiled from source.
>>
>> Channel 222 is CNN Headline News (love my Robin Meade). I am seeing
>> some sort of video noise or distortion across what seems to be the
>> very top pixel of my playback image. This happens in LiveTV and also
>> on Recording.
>>
>> This morning I used the Shutdown-Menu on the Motorola DCX3200 to tell
>> the STB that my TV only handles 1080i and 720p which finally got me a
>> full screen image on my Samsung LCD Television. Now that Samsung is
>> connected to frontend using the VGA dsub. The max resolution on this
>> Tv is 1368x768 so I wasn't going to mess with the HDMI out on my
>> frontend's motherboard.
>>
>> The motherboard is an ASUS with an onboard nVidia as follows from lspci:
>>
>> 02:00.0 VGA compatible controller: nVidia Corporation C77 [GeForce
>> 8300] (rev a2)
>>
>> VDPAU seems to be working ok out of the box - the distro is MythBuntu
>> 9.10.
>>
>> I tried adjusting the Vertical offset in the Setup-->Playback menu. I
>> moved it from 0 through 10 (trying each incrementally) and I wasn't
>> able to notice any difference. It does seem that each time I invoke
>> the LiveTv mode I may get a more or less dramatic experience of this
>> noise.
>>
>> Does anyone know what this is and how to go about resolving it?
>>
>
> Sounds like the Closed Caption data. You don't normally see it because of
> overscan. Try the newest NVidia drivers and see if you can get it to
> overscan the TV output just a little to get that row of pixels out of the
> visible area of the screen. When using VDPAU, you can't use the scaling and
> such built into Myth from what I've read on the list, so you need to use the
> drivers to do it. Both of my systems overscan way to much by default, so I
> use the "Overscan Compensation" in the Nvidia X setup utility to set it so
> that I just just a little overscan, so I don't see that line but I can see
> all of the image.
>
> You might have more luck getting overscanning on HDMI as the VGA output
> might not support it (it's not generally done on computer monitors). Modern
> video cards like the 8300 work pretty much out of the box with HDMI. I
> didn't do any setup to get it working on my machine other than making sure
> the NVidia driver was installed. Even BIOS/POST show up over HDMI now.� One
> of my frontends uses an Asus M3N78 with the onboard 8300 chip. Works great
> with HDMI. I'm not using HDMI audio, so I can't speak to that. That TV is
> just using the TV speakers, so I used analog stereo out for it.
>
>
> _______________________________________________
> mythtv-users mailing list
> mythtv-users [at] mythtv
> http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users
>
>
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kenneth.emerson at gmail

Nov 20, 2009, 11:16 AM

Post #5 of 30 (1940 views)
Permalink

Re: Video noise or distortion across very top edge of image [In reply to]

>
> I'm also familiar with nvidia-settings I've just never messed with
> overscan.
>
> I'll try this when I get home.
>
> I'm also seeing the following in the dmesg on the backend:
>
> [ 128.035461] hdpvr 1-4:1.0: untested firmware version 0xf, the
> driver might not work
> [ 128.333099] hdpvr 1-4:1.0: device now attached to /dev/video0
>
> I assumed I had the latest firmware since my HD-PVR purchase was 1
> week ago. Message threads seem to indicate that this message appears
> if your firmware is too recent. Does anyone know what version 0xf
> equates to and if I need to find a Windows machine to upgrade the
> firmware on my HD-PVR with? The only windows machine in my house my
> partner's laptop running Vista. Is Vista even a supported OS for the
> firmware update or do I need to temporarily load XP on a spare
> machine?
>
> Mr. Walker:

I purchased my HD-PVR from Newegg about 2 months ago and it also came with
0xf firmware. I updated it using the enclosed CD and Haupaugge's web site.
It is now recognized by dmesg as 0x12 so I believe you are not using the
most recent firmware.

-- Ken E.

johnnyjboss at gmail

Nov 20, 2009, 11:21 AM

Post #6 of 30 (1945 views)
Permalink

Re: Video noise or distortion across very top edge of image [In reply to]

Good to know - I'll update that when I get home.

Anyone know if I can accomplish that in Vista?

On Fri, Nov 20, 2009 at 1:16 PM, Kenneth Emerson
<kenneth.emerson [at] gmail> wrote:
>> I'm also familiar with nvidia-settings I've just never messed with
>> overscan.
>>
>> I'll try this when I get home.
>>
>> I'm also seeing the following in the dmesg on the backend:
>>
>> [ �128.035461] hdpvr 1-4:1.0: untested firmware version 0xf, the
>> driver might not work
>> [ �128.333099] hdpvr 1-4:1.0: device now attached to /dev/video0
>>
>> I assumed I had the latest firmware since my HD-PVR purchase was 1
>> week ago. Message threads seem to indicate that this message appears
>> if your firmware is too recent. Does anyone know what version 0xf
>> equates to and if I need to find a Windows machine to upgrade the
>> firmware on my HD-PVR with? The only windows machine in my house my
>> partner's laptop running Vista. Is Vista even a supported OS for the
>> firmware update or do I need to temporarily load XP on a spare
>> machine?
>>
> Mr. Walker:
> I purchased my HD-PVR from Newegg about 2 months ago and it also came with
> 0xf firmware. I updated it using the enclosed CD and Haupaugge's web site.
> �It is now recognized by dmesg as 0x12 so I believe you are not using the
> most recent firmware.
> -- Ken E.
> _______________________________________________
> mythtv-users mailing list
> mythtv-users [at] mythtv
> http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users
>
>
_______________________________________________
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johnnyjboss at gmail

Nov 24, 2009, 5:09 AM

Post #7 of 30 (1845 views)
Permalink

Re: Video noise or distortion across very top edge of image [In reply to]

On Fri, Nov 20, 2009 at 11:21 AM, Johnny Walker <johnnyjboss [at] gmail> wrote:
> Good to know - I'll update that when I get home.
>
> Anyone know if I can accomplish that in Vista?
>
> On Fri, Nov 20, 2009 at 1:16 PM, Kenneth Emerson
> <kenneth.emerson [at] gmail> wrote:
>>> I'm also familiar with nvidia-settings I've just never messed with
>>> overscan.
>>>
>>> I'll try this when I get home.
>>>
>>> I'm also seeing the following in the dmesg on the backend:
>>>
>>> [ �128.035461] hdpvr 1-4:1.0: untested firmware version 0xf, the
>>> driver might not work
>>> [ �128.333099] hdpvr 1-4:1.0: device now attached to /dev/video0
>>>
>>> I assumed I had the latest firmware since my HD-PVR purchase was 1
>>> week ago. Message threads seem to indicate that this message appears
>>> if your firmware is too recent. Does anyone know what version 0xf
>>> equates to and if I need to find a Windows machine to upgrade the
>>> firmware on my HD-PVR with? The only windows machine in my house my
>>> partner's laptop running Vista. Is Vista even a supported OS for the
>>> firmware update or do I need to temporarily load XP on a spare
>>> machine?
>>>
>> Mr. Walker:
>> I purchased my HD-PVR from Newegg about 2 months ago and it also came with
>> 0xf firmware. I updated it using the enclosed CD and Haupaugge's web site.
>> �It is now recognized by dmesg as 0x12 so I believe you are not using the
>> most recent firmware.
>> -- Ken E.
>> _______________________________________________
>> mythtv-users mailing list
>> mythtv-users [at] mythtv
>> http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users
>>
>>
>

I did get this upgraded in Vista - no problem.

I was not however able to find the Overscan settings in nvidia-settings.

I am also having trouble getting the HDMI to be working after reboot.
Each time I enable it and reboot, it is disabled again.

I also have trouble - I set my Cable box to 'my tv only supports 720
and 1080i - suddenly it recorded Dexter at 1080i and my frontend had
issues decoding it smoothly. I was using VDPAU High Quality and it
stuttered pretty bad. I changed to VDPAU normal and it was better but
on panning I noticed some aliasing.

Does anyone know what the nest settings are for the onboard nVidia using VDPAU?

The device shows as follows in lspci:

VGA compatible controller: nVidia Corporation C77 [GeForce 8300] (rev a2)
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halcyon at obfus

Nov 24, 2009, 5:46 AM

Post #8 of 30 (1847 views)
Permalink

Re: Video noise or distortion across very top edge of image [In reply to]

> I did get this upgraded in Vista - no problem.
>
> I was not however able to find the Overscan settings in nvidia-settings.
>
> I am also having trouble getting the HDMI to be working after reboot.
> Each time I enable it and reboot, it is disabled again.
>
> I also have trouble - I set my Cable box to 'my tv only supports 720
> and 1080i - suddenly it recorded Dexter at 1080i and my frontend had
> issues decoding it smoothly. I was using VDPAU High Quality and it
> stuttered pretty bad. I changed to VDPAU normal and it was better but
> on panning I noticed some aliasing.
>
> Does anyone know what the nest settings are for the onboard nVidia using
> VDPAU?
>
> The device shows as follows in lspci:
>
> VGA compatible controller: nVidia Corporation C77 [GeForce 8300] (rev a2)

For my GeForce 8500 GT, Advanced 2x ALMOST works on everything... except
NBC 1080i shows for some reason. I've had to bump down the main deint to
Temporal 2X, and to me it looks better than Advanced 1x, which I've set
for my backup deint.

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johnnyjboss at gmail

Nov 24, 2009, 7:49 AM

Post #9 of 30 (1845 views)
Permalink

Re: Video noise or distortion across very top edge of image [In reply to]

On Tue, Nov 24, 2009 at 7:46 AM, Stuart Larson <halcyon [at] obfus> wrote:
>> I did get this upgraded in Vista - no problem.
>>
>> I was not however able to find the Overscan settings in nvidia-settings.
>>
>> I am also having trouble getting the HDMI to be working after reboot.
>> Each time I enable it and reboot, it is disabled again.
>>
>> I also have trouble - I set my Cable box to 'my tv only supports 720
>> and 1080i - suddenly it recorded Dexter at 1080i and my frontend had
>> issues decoding it smoothly. I was using VDPAU High Quality and it
>> stuttered pretty bad. I changed to VDPAU normal and it was better but
>> on panning I noticed some aliasing.
>>
>> Does anyone know what the nest settings are for the onboard nVidia using
>> VDPAU?
>>
>> The device shows as follows in lspci:
>>
>> VGA compatible controller: nVidia Corporation C77 [GeForce 8300] (rev a2)
>
> For my GeForce 8500 GT, Advanced 2x ALMOST works on everything... except
> NBC 1080i shows for some reason. �I've had to bump down the main deint to
> Temporal 2X, and to me it looks better than Advanced 1x, which I've set
> for my backup deint.

I don't follow you - I'm using VDPAU on the playback profiles -
There's VDPAU Slim, Normal and High Quality.

Where do these Temporal 2X and Advanced 1x come in?

> _______________________________________________
> mythtv-users mailing list
> mythtv-users [at] mythtv
> http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users
>
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jarpublic at gmail

Nov 24, 2009, 7:51 AM

Post #10 of 30 (1844 views)
Permalink

Re: Video noise or distortion across very top edge of image [In reply to]

> I also have trouble - I set my Cable box to 'my tv only supports 720
> and 1080i - suddenly it recorded Dexter at 1080i and my frontend had
> issues decoding it smoothly. I was using VDPAU High Quality and it
> stuttered pretty bad. I changed to VDPAU normal and it was better but
> on panning I noticed some aliasing.

Unfortunately for you the 8300 is one the least powerful VDPAU capable
chips. It will do the decoding but you are going to be very limited on
your deinterlacers. Look at the chart in the wiki:
http://www.mythtv.org/wiki/VDPAU#Supported_Cards. You are going to be
limited to One Field, Bob, and Temporal 1x. The 8300 is very similar
to the 8200.
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jarpublic at gmail

Nov 24, 2009, 7:53 AM

Post #11 of 30 (1833 views)
Permalink

Re: Video noise or distortion across very top edge of image [In reply to]

> I don't follow you - I'm using VDPAU on the playback profiles -
> There's VDPAU Slim, Normal and High Quality.
>
> Where do these Temporal 2X and Advanced 1x come in?

These are the deinterlacers. the Slim, Normal, and High are
preconfigured profiles that have selected different deinterlacers for
varying capabilities of the cards. Edit one of those playback profiles
to see where you can pick the deinterlacer. Or better yet, create your
own profile and choose the deinterlacer that is appropriate for your
card.
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travis at tabbal

Nov 24, 2009, 8:04 AM

Post #12 of 30 (1839 views)
Permalink

Re: Video noise or distortion across very top edge of image [In reply to]

On Tue, Nov 24, 2009 at 8:53 AM, Johnny <jarpublic [at] gmail> wrote:

> > I don't follow you - I'm using VDPAU on the playback profiles -
> > There's VDPAU Slim, Normal and High Quality.
> >
> > Where do these Temporal 2X and Advanced 1x come in?
>
> These are the deinterlacers. the Slim, Normal, and High are
> preconfigured profiles that have selected different deinterlacers for
> varying capabilities of the cards. Edit one of those playback profiles
> to see where you can pick the deinterlacer. Or better yet, create your
> own profile and choose the deinterlacer that is appropriate for your
> card.
>

You could also ask your cable box to output everything in 720p instead. Or
have the HD-PVR only encode things that way, then you never have to worry
about deinterlacing on your FE. Most of the time, I can't tell the
difference in quality between 1080i and 720p and just prefer to have
progressive so I don't have to fool with deinterlacing. On a nice big
screen, 1080p certainly looks better, if you have a bluray to view. Not much
else is available at that resolution.

Did you set the CPU clock speed up for your FE box? Check the wiki,
aparently, the CPU downclocking can cause memory bandwidth starvation for
the GPU. Bumping up the clock can help a lot with stuttering. I'm on an 8300
as well for one of my FEs and it works a lot better after doing that little
hack. I believe I have that FE set to use Advanced 1x on 1080i content. I
created my own VDPAU profile so I could control it all, I also increased the
VDPAU buffers, but that was for a few problem files in MythVideo. TV
recordings don't need it.

johnnyjboss at gmail

Nov 24, 2009, 8:42 AM

Post #13 of 30 (1822 views)
Permalink

Re: Video noise or distortion across very top edge of image [In reply to]

On Tue, Nov 24, 2009 at 9:51 AM, Johnny <jarpublic [at] gmail> wrote:
>> I also have trouble - I set my Cable box to 'my tv only supports 720
>> and 1080i - suddenly it recorded Dexter at 1080i and my frontend had
>> issues decoding it smoothly. I was using VDPAU High Quality and it
>> stuttered pretty bad. I changed to VDPAU normal and it was better but
>> on panning I noticed some aliasing.
>
> Unfortunately for you the 8300 is one the least powerful VDPAU capable
> chips. It will do the decoding but you are going to be very limited on
> your deinterlacers. Look at the chart in the wiki:
> http://www.mythtv.org/wiki/VDPAU#Supported_Cards. You are going to be
> limited to One Field, Bob, and Temporal 1x. The 8300 is very similar
> to the 8200.

I suspected as much - I think I'll swap this motherboard into my
backend as it's more powerful and make a new frontend using an Atom
board. I see discussion on this list of which atom form factor boards
are good.

Can anyone suggest a good and stylish atom form factor case for HTPC?

> _______________________________________________
> mythtv-users mailing list
> mythtv-users [at] mythtv
> http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users
>
_______________________________________________
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travis at tabbal

Nov 24, 2009, 8:53 AM

Post #14 of 30 (1827 views)
Permalink

Re: Video noise or distortion across very top edge of image [In reply to]

On Tue, Nov 24, 2009 at 9:42 AM, Johnny Walker <johnnyjboss [at] gmail>wrote:

>
> Can anyone suggest a good and stylish atom form factor case for HTPC?
>
>

For the money, I'd go with the $200 Aspire Revo. Atom ION based. The Zotac
ION boards are highly reviewed around here as well, but then you need a
case, maybe a power supply, RAM, etc..

johnnyjboss at gmail

Nov 24, 2009, 9:19 AM

Post #15 of 30 (1828 views)
Permalink

Re: Video noise or distortion across very top edge of image [In reply to]

On Tue, Nov 24, 2009 at 10:53 AM, Travis Tabbal <travis [at] tabbal> wrote:
>
>
> On Tue, Nov 24, 2009 at 9:42 AM, Johnny Walker <johnnyjboss [at] gmail>
> wrote:
>>
>> Can anyone suggest a good and stylish atom form factor case for HTPC?
>>
>
>
> For the money, I'd go with the $200 Aspire Revo. Atom ION based. The Zotac
> ION boards are highly reviewed around here as well, but then you need a
> case, maybe a power supply, RAM, etc..

You mean like this one:

http://www.amazon.com/Acer-AspireRevo-AR1600-U910H-Desktop-Windows/dp/B002O3W44Q/ref=wl_it_dp_o?ie=UTF8&coliid=I5C3UAPRBQ873&colid=1OK4QW6CCJML

It's only 100BaseT on the NIC - is that fast enough for 1080i?

Is the ION onboard able to handle 1080i recordings coming off the HD-PVR?

> _______________________________________________
> mythtv-users mailing list
> mythtv-users [at] mythtv
> http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users
>
>
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travis at tabbal

Nov 24, 2009, 9:24 AM

Post #16 of 30 (1826 views)
Permalink

Re: Video noise or distortion across very top edge of image [In reply to]

On Tue, Nov 24, 2009 at 10:19 AM, Johnny Walker <johnnyjboss [at] gmail>wrote:

>
> You mean like this one:
>
>
> http://www.amazon.com/Acer-AspireRevo-AR1600-U910H-Desktop-Windows/dp/B002O3W44Q/ref=wl_it_dp_o?ie=UTF8&coliid=I5C3UAPRBQ873&colid=1OK4QW6CCJML
>
> It's only 100BaseT on the NIC - is that fast enough for 1080i?
>
> Is the ION onboard able to handle 1080i recordings coming off the HD-PVR?
>

100M is fast enough for HD. The HDHomeRun can do 2 tuners of HD on 100M.
That should be a non issue anyway as according to Newegg, it has a gigabit
port.

http://www.newegg.com/Product/Product.aspx?Item=N82E16883103228&cm_re=aspire_revo-_-83-103-228-_-Product

Deinterlacing might be a bit of an issue with the Revo, but that should be
the only possible problem. I'm sure someone else on the list will chime in
as I know some people here have them. With an HD-PVR, I would personally set
it to use 720p and be done with it. I find interlacing more trouble than
it's worth.

jarpublic at gmail

Nov 24, 2009, 9:31 AM

Post #17 of 30 (1833 views)
Permalink

Re: Video noise or distortion across very top edge of image [In reply to]

> You mean like this one:
>
> http://www.amazon.com/Acer-AspireRevo-AR1600-U910H-Desktop-Windows/dp/B002O3W44Q/ref=wl_it_dp_o?ie=UTF8&coliid=I5C3UAPRBQ873&colid=1OK4QW6CCJML
>
> It's only 100BaseT on the NIC - is that fast enough for 1080i?
>
> Is the ION onboard able to handle 1080i recordings coming off the HD-PVR?

You would need to use VDPAU, that is the whole reason the ION systems
are popular. As for performance the IONs use a 9400M GPU with an Atom
processor. You can see the VDPAU wiki:
http://www.mythtv.org/wiki/VDPAU#Supported_Cards. The 9400 can do all
of the deinterlacers on HD except Advanced 2x. It could do Advanced 2x
on SD though. Many people are totally happy with Temporal 2x though so
I wouldn't consider not having Advanced 2x to be a deal breaker.
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johnnyjboss at gmail

Nov 24, 2009, 9:31 AM

Post #18 of 30 (1831 views)
Permalink

Re: Video noise or distortion across very top edge of image [In reply to]

On Tue, Nov 24, 2009 at 11:24 AM, Travis Tabbal <travis [at] tabbal> wrote:
>
>
> On Tue, Nov 24, 2009 at 10:19 AM, Johnny Walker <johnnyjboss [at] gmail>
> wrote:
>>
>> You mean like this one:
>>
>>
>> http://www.amazon.com/Acer-AspireRevo-AR1600-U910H-Desktop-Windows/dp/B002O3W44Q/ref=wl_it_dp_o?ie=UTF8&coliid=I5C3UAPRBQ873&colid=1OK4QW6CCJML
>>
>> It's only 100BaseT on the NIC - is that fast enough for 1080i?
>>
>> Is the ION onboard able to handle 1080i recordings coming off the HD-PVR?
>
>
> 100M is fast enough for HD. The HDHomeRun can do 2 tuners of HD on 100M.
> That should be a non issue anyway as according to Newegg, it has a gigabit
> port.
>
> http://www.newegg.com/Product/Product.aspx?Item=N82E16883103228&cm_re=aspire_revo-_-83-103-228-_-Product
>
> Deinterlacing might be a bit of an issue with the Revo, but that should be
> the only possible problem. I'm sure someone else on the list will chime in
> as I know some people here have them. With an HD-PVR, I would personally set
> it to use 720p and be done with it. I find interlacing more trouble than
> it's worth.

I was having that thought - I've not even had HD until recently - I
might as well set the box to 720p and like it.

I was kinda surprised when I saw the jittery playback and checked the
listing and saw the 1080 logo at the bottom right. I'm a little
confused as to which channels on my Time Warner Cable are at what HD
resolution. Since the HD-PVR encodes at what is sent from the box, and
there seems to be duplicate channels in my line ups. I need to spend
some time working all this out but it means I have to be sitting in
front of the TV and I do much of my research while I'm actually at
work. I'm such a slacker.

>
> _______________________________________________
> mythtv-users mailing list
> mythtv-users [at] mythtv
> http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users
>
>
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jarpublic at gmail

Nov 24, 2009, 9:46 AM

Post #19 of 30 (1836 views)
Permalink

Re: Video noise or distortion across very top edge of image [In reply to]

> I was having that thought - I've not even had HD until recently - I
> might as well set the box to 720p and like it.

Most of the channels are in 1080i I believe. One thing to keep in mind
is that if the the original signal is 1080i then it has to get
deinterlaced somewhere. If you set your STB to 720p then it is doing
the deinterlacing. If you keep it at 1080i then the you can let
mythtv/GPU do it, or you can even do some work to get it all the way
to your TV and let it do it. My point is that setting your STB doesn't
get rid of the the deinterlacing issue it just moves around where it
gets done. I would bet that VDPAU does a better job than most cheap
STB would do.
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johnnyjboss at gmail

Nov 24, 2009, 11:14 AM

Post #20 of 30 (1816 views)
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Re: Video noise or distortion across very top edge of image [In reply to]

On Tue, Nov 24, 2009 at 9:51 AM, Johnny <jarpublic [at] gmail> wrote:
>> I also have trouble - I set my Cable box to 'my tv only supports 720
>> and 1080i - suddenly it recorded Dexter at 1080i and my frontend had
>> issues decoding it smoothly. I was using VDPAU High Quality and it
>> stuttered pretty bad. I changed to VDPAU normal and it was better but
>> on panning I noticed some aliasing.
>
> Unfortunately for you the 8300 is one the least powerful VDPAU capable
> chips. It will do the decoding but you are going to be very limited on
> your deinterlacers. Look at the chart in the wiki:
> http://www.mythtv.org/wiki/VDPAU#Supported_Cards.

Oh wow - I was using the driver in Aptitude which was nvidia-185 - I
found that nvidia released a new beta driver today:

ftp://download.nvidia.com/XFree86/Linux-x86/195.22/README/index.html

You are going to be
> limited to One Field, Bob, and Temporal 1x. The 8300 is very similar
> to the 8200.
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travis at tabbal

Nov 24, 2009, 11:18 AM

Post #21 of 30 (1817 views)
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Re: Video noise or distortion across very top edge of image [In reply to]

On Tue, Nov 24, 2009 at 12:14 PM, Johnny Walker <johnnyjboss [at] gmail>wrote:

>
> Oh wow - I was using the driver in Aptitude which was nvidia-185 - I
> found that nvidia released a new beta driver today:
>

Yeah, that one doesn't have overscan options. I'm using 190.42 and the
options are there. I haven't tried the 195 drivers. Now that I have it
working well, I plan to let things sit for a while. :)

newbury at mandamus

Nov 24, 2009, 7:21 PM

Post #22 of 30 (1802 views)
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Re: Video noise or distortion across very top edge of image [In reply to]

Johnny Walker wrote:
> On Tue, Nov 24, 2009 at 9:51 AM, Johnny <jarpublic [at] gmail> wrote:
>>> I also have trouble - I set my Cable box to 'my tv only supports 720
>>> and 1080i - suddenly it recorded Dexter at 1080i and my frontend had
>>> issues decoding it smoothly. I was using VDPAU High Quality and it
>>> stuttered pretty bad. I changed to VDPAU normal and it was better but
>>> on panning I noticed some aliasing.
>> Unfortunately for you the 8300 is one the least powerful VDPAU capable
>> chips. It will do the decoding but you are going to be very limited on
>> your deinterlacers. Look at the chart in the wiki:
>> http://www.mythtv.org/wiki/VDPAU#Supported_Cards. You are going to be
>> limited to One Field, Bob, and Temporal 1x. The 8300 is very similar
>> to the 8200.
>
> I suspected as much - I think I'll swap this motherboard into my
> backend as it's more powerful and make a new frontend using an Atom
> board. I see discussion on this list of which atom form factor boards
> are good.
>
> Can anyone suggest a good and stylish atom form factor case for HTPC?

Zotac just announced a ION mb plus atom form factor case combo. It's a
book sized plastic case like some of the Morex cases. Nice.

I'm using a Casetronic 299 which comes with an external brick and a PICO
psu style plugin, so the ION-A-E which I bought was actually the wrong
unit. I ended up with 2 bricks! The Casetronic is an all metal unit: a
little more industrial looking. Lots of ventilation.

Geoff

--
Please let me know if anything I say offends you.
I may wish to offend you again in the future.

Tux says: "Be regular. Eat cron flakes."
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johnnyjboss at gmail

Nov 25, 2009, 2:17 PM

Post #23 of 30 (1769 views)
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Re: Video noise or distortion across very top edge of image [In reply to]

On Fri, Nov 20, 2009 at 10:59 AM, Brian J. Murrell
<brian [at] interlinx> wrote:
> On Fri, 2009-11-20 at 10:49 -0600, Johnny Walker wrote:
>>
>> Channel 222 is CNN Headline News (love my Robin Meade). I am seeing
>> some sort of video noise or distortion across what seems to be the
>> very top pixel of my playback image. This happens in LiveTV and also
>> on Recording.
>
> Are you overscanning on playback or are you displaying every single
> pixel of the captured picture inside your viewable area on the playback?
>
> Hiding this sort of "edge distortion" is what overscan is for.
>
>> I tried adjusting the Vertical offset in the Setup-->Playback menu. I
>> moved it from 0 through 10 (trying each incrementally) and I wasn't
>> able to notice any difference. It does seem that each time I invoke
>> the LiveTv mode I may get a more or less dramatic experience of this
>> noise.
>
> Can you not make the video hardware do the overscanning? �I do this with
> my 5200FX, admittedly in a pure analog output stream. �Maybe using VDPAU
> restricts this video card driven overscanning?
>
> I set up the overscanning on mine with nvidia-settings. �I basically
> tuned it until what I was seeing coming from Myth matched exactly what I
> saw watching native television.

I have updated to the latest Nvidia driver and all I have is OverScan
compensation where I can make the image smaller. I am unable to make
the image grow so that this line of data would be off the screen.

Any tips from anyone else on this?

>
> b.
>
>
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>
>
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johnnyjboss at gmail

Nov 30, 2009, 8:55 AM

Post #24 of 30 (1641 views)
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Re: Video noise or distortion across very top edge of image [In reply to]

On Tue, Nov 24, 2009 at 9:53 AM, Johnny <jarpublic [at] gmail> wrote:
>> I don't follow you - I'm using VDPAU on the playback profiles -
>> There's VDPAU Slim, Normal and High Quality.
>>
>> Where do these Temporal 2X and Advanced 1x come in?
>
> These are the deinterlacers. the Slim, Normal, and High are
> preconfigured profiles that have selected different deinterlacers for
> varying capabilities of the cards. Edit one of those playback profiles
> to see where you can pick the deinterlacer. Or better yet, create your
> own profile and choose the deinterlacer that is appropriate for your
> card.

Johnny don't you have the same motherboard? The ASUS M3N78-EM? Do you
not see the video distortion across the top the some of the playback?
I'm not able to find the option to turn on Overscan - I only see
Overscan compensation in the Nvidia-settings utility.

I heard that the video offset in the frontend settings is disabled by
VDPAU - so is there a solution to this?

> _______________________________________________
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>
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jarpublic at gmail

Nov 30, 2009, 9:46 AM

Post #25 of 30 (1650 views)
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Re: Video noise or distortion across very top edge of image [In reply to]

> Johnny don't you have the same motherboard? The ASUS M3N78-EM? Do you
> not see the video distortion across the top the some of the playback?
> I'm not able to find the option to turn on Overscan - I only see
> Overscan compensation in the Nvidia-settings utility.

I do have that board but I actually have a 8400GS card in it because I
needed s-video or component out for my SD CRT. Overscan is not
something you turn on. The TV set is what does the overscan. The
nvidia setting is called overscan compensation because it is designed
to compensate for TVs that are overscanning the image. That is why it
only scales down and it doesn't have an option to scale it larger.
With one of my machines a few years ago I remember I had the problem
of seeing the noise in the first few lines at the top of the screen
and I just used the screen wizard in mythtv to scale the image a
little bit and that handled it fine. Some people would argue against
this but I didn't see any noticeable loss in image quality from the
scaling. Maybe that is because it was already getting rescaled
somewhere along the line because of my display resolution etc.
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