Mailing List Archive: MythTV: Users

Intel video

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dave at daveoxley

Jul 16, 2008, 2:20 AM

Post #1 of 6 (2900 views)
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Intel video

I have an Abit iL-90MV motherboard which is a very cool MOTD board with
integrated HDMI. I am very impressed with it; I just connected to the
Plasma and got 1280x720 video and sound with barely any configuration!
However I have found that when playing back video (MythTV and xine) I
get a corruption line that gradually moves down the screen. Kind of
reminds me of tracking on a VCR! I've tried various different MythTV
options like XVMC and they all either have the same problem or very
jerky video instead.

Does anyone have any ideas how to solve this please or has this been
seen before? I really don't want to have to get a new graphics card;
this machine was supposed to be low power and I've never seen such good
'plug and play' with Linux displays before!

I upgraded X11 from 7.2 to 7.3 and xf86-video-i810 from 2.1.1 to 2.3.2
yesterday but that made no difference. It runs Gentoo with the following
various software:
x11-libs/libdrm-2.3.0, x11-base/x11-drm-20071019, media-libs/mesa-7.0.3,
x11-base/xorg-server-1.4.2, x11-drivers/xf86-video-i810-2.3.2 and
x11-base/xorg-x11-7.3.

Various other info below.

Cheers,
Dave.

uname -a:
Linux bob 2.6.25-gentoo-r6 #4 SMP Tue Jul 15 21:31:19 EST 2008 x86_64
Intel(R) Core(TM)2 CPU T5500 @ 1.66GHz GenuineIntel GNU/Linux

lspci:
00:02.0 VGA compatible controller: Intel Corporation Mobile 945GM/GMS,
943/940GML Express Integrated Graphics Controller (rev 03)
00:02.1 Display controller: Intel Corporation Mobile 945GM/GMS,
943/940GML Express Integrated Graphics Controller (rev 03)

lsmod:
Module Size Used by
i915 35968 3
drm 144544 4 i915
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newbury at mandamus

Jul 16, 2008, 9:41 AM

Post #2 of 6 (2793 views)
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Re: Intel video [In reply to]

Dave Oxley wrote:
> I have an Abit iL-90MV motherboard which is a very cool MOTD board with
> integrated HDMI. I am very impressed with it; I just connected to the
> Plasma and got 1280x720 video and sound with barely any configuration!
> However I have found that when playing back video (MythTV and xine) I
> get a corruption line that gradually moves down the screen. Kind of
> reminds me of tracking on a VCR! I've tried various different MythTV
> options like XVMC and they all either have the same problem or very
> jerky video instead.
>
> Does anyone have any ideas how to solve this please or has this been
> seen before? I really don't want to have to get a new graphics card;
> this machine was supposed to be low power and I've never seen such good
> 'plug and play' with Linux displays before!
>
> I upgraded X11 from 7.2 to 7.3 and xf86-video-i810 from 2.1.1 to 2.3.2
> yesterday but that made no difference. It runs Gentoo with the following
> various software:
> x11-libs/libdrm-2.3.0, x11-base/x11-drm-20071019, media-libs/mesa-7.0.3,
> x11-base/xorg-server-1.4.2, x11-drivers/xf86-video-i810-2.3.2 and
> x11-base/xorg-x11-7.3.
>

Well that is certainly the latest intel driver.

Is mythtv compiled with xvmc? Are the various xvmc settings correct?

Have your tried various (of the many) combinations of video filters in
TV Playback settings?

What happens when you play a video with mplayer using '-vo xv' or any
other switches?

Note that, unfortunately, the Intel driver is broken for xvmc for frames
over 720x568 in size. Actually the xvmc works, but something else in the
driver is broken, so that playing a 720p stream with 'mplayer -vo xvmc
-vc ffmpeg12mc' gives the correct output, including a reduced CPU load,
but with a bright green pixelated overlay (like night vision goggles).

None of this sounds like the 'tracking error' effect you are seeing
however.

I have had no problems with the Intel driver going back to the i810
version, aside from xvmc. Try choosing a non-xvmc setting in myth.

Geoff
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tino.keitel at gmx

Jul 16, 2008, 10:40 AM

Post #3 of 6 (2790 views)
Permalink

Re: Intel video [In reply to]

On Wed, Jul 16, 2008 at 19:20:29 +1000, Dave Oxley wrote:
> I have an Abit iL-90MV motherboard which is a very cool MOTD board with
> integrated HDMI. I am very impressed with it; I just connected to the
> Plasma and got 1280x720 video and sound with barely any configuration!
> However I have found that when playing back video (MythTV and xine) I
> get a corruption line that gradually moves down the screen. Kind of
> reminds me of tracking on a VCR! I've tried various different MythTV
> options like XVMC and they all either have the same problem or very
> jerky video instead.

That sounds like the tearing video problem that is caused by the
textured video XV port of the intel driver. Please check the output of
this command:

xvinfo | grep -E "Adaptor|port base"

If you only see the "Intel(R) Textured Video" adaptor, then it seems as
you have to live with it.

If you also see a "Intel(R) Video Overlay" adapotor, then you have at
least 2 options:

1. Rebuild MythTV with a patch so that the frontend ignores the
textured video XV port.

http://tikei.de/50_skip_intel_textured_video.dpatch

2. Rebuild the Intel Xorg driver with a patch that adds an option
called "XvPreferOverlay" to give the video overlay port higher
priority. Just add Option "XvPreferOverlay" "true" to the device
section in your xorg.conf.

http://tikei.de/intel-prefer-hardware-overlay.diff

The latter will also work with all other applications, whereas the
first patch only fixes mythtv playback.

To test if video overlay works better without patching anything, you
can use mplayer:

mplayer file.mpg -vo xv:port=<port>

For <port>, use the port number from the xvinfo output above. If you
use the port number of the video overlay adaptor, the tearing video
should not happen, whereas a simple "mplayer file.mpg" should.

Regards,
Tino

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dave at daveoxley

Jul 16, 2008, 6:31 PM

Post #4 of 6 (2784 views)
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Re: Intel video [In reply to]

Tino Keitel wrote:

On Wed, Jul 16, 2008 at 19:20:29 +1000, Dave Oxley wrote:
I have an Abit iL-90MV motherboard which is a very cool MOTD board with integrated HDMI. I am very impressed with it; I just connected to the Plasma and got 1280x720 video and sound with barely any configuration! However I have found that when playing back video (MythTV and xine) I get a corruption line that gradually moves down the screen. Kind of reminds me of tracking on a VCR! I've tried various different MythTV options like XVMC and they all either have the same problem or very jerky video instead.
2. Rebuild the Intel Xorg driver with a patch that adds an option called "XvPreferOverlay" to give the video overlay port higher priority. Just add Option "XvPreferOverlay" "true" to the device section in your xorg.conf. http://tikei.de/intel-prefer-hardware-overlay.diff"]http://tikei.de/intel-prefer-hardware-overlay.diff The latter will also work with all other applications, whereas the first patch only fixes mythtv playback.

Thank you very much. I've rebuilt the driver with the patch and turned the option on as this seemed like the cleanest solution and the video is now flawless. Don't you just love open source.

Cheers,
Dave.

tino.keitel at gmx

Jul 16, 2008, 10:36 PM

Post #5 of 6 (2785 views)
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Re: Intel video [In reply to]

On Thu, Jul 17, 2008 at 11:31:28 +1000, Dave Oxley wrote:
> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
> <html>
> <head>
> <meta content="text/html;charset=ISO-8859-1" http-equiv="Content-Type">
> </head>
> <body bgcolor="#ffffff" text="#000000">

[...]

> Thank you very much. I've rebuilt the driver with the patch and turned
> the option on as this seemed like the cleanest solution and the video
> is now flawless. Don't you just love open source.<br>
> <br>

I'd love it even more if people wo want to say "thank you" don't send
me HTML mails. :-)

> Cheers,<br>
> Dave.<br>
> </body>
> </html>

Regards,
Tino
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tino.keitel at gmx

Jul 16, 2008, 10:38 PM

Post #6 of 6 (2773 views)
Permalink

Re: Intel video [In reply to]

On Thu, Jul 17, 2008 at 07:36:24 +0200, Tino Keitel wrote:

[...]

> I'd love it even more if people wo want to say "thank you" don't send
> me HTML mails. :-)

...and also care about the Mail-Followup-To: line in my mails, of cause.

Regards,
Tino
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