[mythtv-users] judder problems with nvidia 384.59 work round

[jksjdevelop]

On 15/08/17 22:30, John Pilkington wrote:
> On 15/08/17 18:02, jksjdevelop wrote:
>>
>>
>> On 14/08/17 22:39, John Pilkington wrote:
>>> On 14/08/17 09:59, jksj wrote:
>>>> Related to the existing thread Judder problems with nvidia 358.16 
>>>> but I have raised this as a separate thread as it only offers a 
>>>> work round.
>>>>
>>>> Recently bought a Nvidia GT 1030 which requires the latest driver 
>>>> (384) and started to suffer from really bad judder.
>>>>
>>>> Puzzled by the fact that other apps like Kodi were judder free but 
>>>> preferred to stick with mythfrontend.
>>>>
>>>> Guessed eventually that Kodi worked because it was using a fixed 
>>>> frame rate unlike Mythtv which was attempting to dynamically adjust 
>>>> it.
>>>>
>>>> So I am now judder free by not following the instructions in 
>>>> https://www.mythtv.org/wiki/User_Manual:JudderFree
>>>>
>>>> Specifically
>>>>
>>>> Fix the refresh rate before running the frontend, for Freesat or 
>>>> Freeview in the UK the following works.
>>>>
>>>> nvidia-settings -a 0/CurrentMetaMode="1920x1080_50 @1920x1080 +0+0"
>>>>
>>>> Then in the “Video Mode Settings” page referred to in the wiki, 
>>>> _un_check “Separate video modes for GUI and TV playback”
>>>>
>>> I have 854.59 too, with a GT 710, and have settings that look quite 
>>> similar, eventually saved from the NVIDIA config GUI; sometimes I 
>>> can get it to come out the same twice.
>>>
>>>  Section "Screen"
>>>     Identifier     "Screen0"
>>>     Device         "Device0"
>>>     Monitor        "Monitor0"
>>>     DefaultDepth    24
>>>     Option         "Stereo" "0"
>>>     Option         "nvidiaXineramaInfoOrder" "CRT-0"
>>>     Option         "metamodes" "HDMI-0: 1920x1080_50 +1024+0, VGA-0: 
>>> 1024x768_75 +0+0"
>>>     Option         "SLI" "Off"
>>>     Option         "MultiGPU" "Off"
>>>     Option         "BaseMosaic" "off"
>>>     SubSection     "Display"
>>>         Depth       24
>>>     EndSubSection
>>> EndSection
>>>
>>> But I still have the defect I've mentioned before. In HD playback 
>>> during pan/tilt there is a perceptible horizontal divider, not 
>>> always in the same position, between two good sections of the 
>>> picture.  It looks as if it ought to be kept off-screen by syncing 
>>> the processing to the TV display, but 'X server XVideo Settings' and 
>>> ~/.nvidia-settings-rc both claim that this is being done.
>>>
>>> I suppose it might be relevant that I'm using
>>> 'mythfrontend -nw --geometry 1920x1080+1024+0' for the tv, with 
>>> 'mythfrontend' by itself giving a windowed 1024x576 display on the 
>>> monitor.
>>>
>>> Is this kind of defect one that other people see - and is there a 
>>> way to stop it?  upnp does give a workaround for me.
>>>
>>> John P
>
>>
>> I have not experienced the  the tearing you describe. A quick google 
>> shows various  Mythtv pages covering this but I think they maybe out 
>> of date. I remember that it used to be necessary to run a desktop 
>> without compositing but I think that is fixed now.
>>
>> The bits that look different in xconfig are
>>
>> Option         "nvidiaXineramaInfoOrder" "CRT-0" --which implies a 
>> VGA connection
>>
>> "metamodes" "HDMI-0: 1920x1080_50 +1024+0, VGA-0: 1024x768_75 +0+0" --
>>
>> If you are driving a VGA connection have you tried re-synching the 
>> monitor using its controls.
>>
>> Do other apps like VLC or Kodi display without tearing?
>>
>>
> Thanks for the response.  Yes, I have a VGA monitor and hdmi TV 
> connected.  I've tried swapping the sync source, switching off the 
> monitor and changing its frame rates, all with no noticeable effect on 
> the solidity of the TV image.  I've tried vlc and smplayer with 
> various settings, and mostly they have been worse. I haven't been able 
> to get smplayer to recognise the nvidia hdmi audio output, either.  I 
> haven't tried Kodi yet.  upnp is working quite well for me but may 
> well be device-dependent.
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Your problem seems independent of Mythtv.
I have tried the patch offered in thread "judder problems with nvidia 
358.16" but that did not work for me.
An instant fix for me on a Sony Android TV is fixing the refresh rate 
using Nvidia Settings.