[mythtvnz] VDPAU package can be removed?

Fri May 8 01:41:01 BST 2009

Thanks for the info. I will have a read and give this a go.

Aaron

From: mythtvnz-bounces at lists.linuxnut.co.nz [mailto:mythtvnz-bounces at lists.linuxnut.co.nz] On Behalf Of Dylan Hall
Sent: Friday, 8 May 2009 12:02
To: MythTV in NZ
Subject: Re: [mythtvnz] VDPAU package can be removed?

On Fri, 2009-05-08 at 11:02 +1200, Aaron Drysdale wrote: 

Because I get a small amount of tearing and judder while watching TV in myth. I originally thought it might have started when I turned on deinterlacing, but someone here said that this is most often associated with a mismatch between the source video fps and monitor refresh rate (at least that is what I took out of it.)

Since we use 25 fps with PAL TV, then my understanding is that I would get a smoother video if I could run the TV at 50Hz. Do you not have that problem? As a test this morning, I turned off deinterlacing, but I still had the slight tearing so I assumed it must be a refresh rate problem.

I don't get any issues like that, but the vast majority of the content I watch is .mkv and .avi files with US origins, so if anything, I probably benefit from the 60Hz default.  What little TV I do watch is SD captured from an analogue source so tends to look fairly rubbish at the best of times.

It might also be worth noting that I use Freevo which uses mplayer for all the playback.

Currently I am just letting the OS select the preferred timing as well, and it is running at 1360x768 @ 60.01 Hz.

I notice the EDID info you posted doesn’t show any other timings? I thought this TV would at least support 50Hz. Why is that not shown?

I'm curious myself, it seems unlikely that those are the only two modes supported. While reading about the CustomEDID stuff mentioned by Jean-Yves I can across this post (http://www.nvnews.net/vbulletin/showthread.php?t=126648) that talks about using "gtf" to generate mode lines, e.g.

> gtf 1360 768 50 

  # 1360x768 @ 50.00 Hz (GTF) hsync: 39.55 kHz; pclk: 69.61 MHz
  Modeline "1360x768_50.00"  69.61  1360 1416 1560 1760  768 769 772 791  -HSync +Vsync

No idea if the above works, but might be worth a try. Read the rest of the post at the link above, there are a bunch of other settings required to force the use of the custom mode line.

Dylan

Thanks

Aaron

	From:mythtvnz-bounces at lists.linuxnut.co.nz [mailto:mythtvnz-bounces at lists.linuxnut.co.nz] On Behalf Of Dylan Hall
	Sent: Friday, 8 May 2009 10:25
	To: MythTV in NZ
	Subject: Re: [mythtvnz] VDPAU package can be removed?

	I have the same TV and I don't use any mode lines to drive it, I just let the driver figure it out for itself. The only caveat is that the TV needs to be switched on and connected if you reboot so that the video card can probe the TV when X starts.

	I've extracted the edid data with "get-edid" and attached the results.

	Running that through "parse-edid" it generates the following:

	parse-edid: parse-edid version 1.4.2
	parse-edid: EDID checksum passed.

	        # EDID version 1 revision 3
	Section "Monitor"
	        # Block type: 2:0 3:fc
	        Identifier "SONY TV"
	        VendorName "SNY"
	        ModelName "SONY TV"
	        # Block type: 2:0 3:fc
	        # Block type: 2:0 3:fd
	        HorizSync 14-68
	        VertRefresh 48-62
	        # Max dot clock (video bandwidth) 150 MHz
	        # DPMS capabilities: Active off:no  Suspend:no  Standby:no

	        Mode    "1360x768"      # vfreq 60.015Hz, hfreq 47.712kHz
	                DotClock        85.500000
	                HTimings        1360 1424 1536 1792
	                VTimings        768 771 777 795
	                Flags   "+HSync" "+VSync"
	        EndMode
	        Mode    "1280x720"      # vfreq 60.000Hz, hfreq 45.000kHz
	                DotClock        74.250000
	                HTimings        1280 1390 1430 1650
	                VTimings        720 725 730 750
	                Flags   "-HSync" "-VSync"
	        EndMode
	        # Block type: 2:0 3:fc
	        # Block type: 2:0 3:fd
	EndSection

	I assume the 1360x768 at 60 mode above is the one the driver figures out for itself. It doesn't look like the panel is reporting a 50Hz mode.

	I'm curious, why do you need/want 50Hz? 

	Dylan

	On Fri, 2009-05-08 at 09:37 +1200, Aaron Drysdale wrote: 

	Thanks for that. So I've now disabled Dynamic Twin View in my xorg.conf
	file, and sure enough in the Xrandr gui the 50 51 52 Hz has disappeared.
	However all it reports now is 60Hz. So I assume this is where I need to
	start coming up with custom modelines to get it to run at 50Hz.

	Unfortunately, my TV is "HD ready" - so it doesn't support 1080p and
	there I can't use your xorg.conf. I'm running it at the native panel
	resolution of 1360x768 and want to get it running at 50Hz. By the way,
	if anyone already has figured out the modelines for a Sony Bravia
	40V300A then I would greatly appreciate hearing from you.

	Does it sound like I'm on the right track?

	Aaron
	-----Original Message-----
	From: mythtvnz-bounces at lists.linuxnut.co.nz
	[mailto:mythtvnz-bounces at lists.linuxnut.co.nz] On Behalf Of Jean-Yves
	Avenard
	Sent: Thursday, 7 May 2009 22:32
	To: MythTV in NZ
	Subject: Re: [mythtvnz] VDPAU package can be removed?

	Hi

	2009/5/7 Aaron Drysdale <Aaron.Drysdale at provencocadmus.com>:
	> I turned off GPU Scaling in the nVidia xserver settings. This got rid
	of the 50 51 52 Hz refresh rates, however now the only refresh rates
	that show up are 60Hz. How can I figure out what the available refrsh
	rates and timings are, so I can put the correct timings in xorg.conf?

	No GPU scaling can't make 50,51 and 52 disappeared. It only prevent
	the refresh being always 60Hz no matter what you choose.

	For what timing to use if you want to set it manually, refer to my
	previous post... There's a link to a xorg.conf that works perfectly
	with Sony TV

	> 
	> You talk about the nvidia-settings program - is this a command line
	util that returns the timings from the EDID? Is there some other way of
	getting the timings from the EDID of my tv?

	no

	nvidia-settings let you play with the driver configuration. It comes
	with the nvidia driver packages... And should be automatically
	installed.
	If not, the package name is nvidia-settings :)

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