[mythtv-users] Video playing at 30fps

[Andrew Wilkinson]

I have discovered that this is caused by a kernel bug -
https://bugzilla.kernel.org/show_bug.cgi?id=74861. Adding
i915.disable_power_well=0
to the kernel boot line solves the issue, or presumably upgrading to 3.16.

Sorry for the noise, but I hope this helps someone else out.

Andrew


On Wed, Nov 12, 2014 at 5:39 PM, Andrew Wilkinson <
andrewjwilkinson at gmail.com> wrote:

> Further investigations into this issue reveal that if I set the audio
> output to NULL then the video plays at 25fps as it should. Obviously the
> lack of sound is a bit of problem...
>
> This leads me to think that there is some issue with ALSA and my Onkyo
> amp. As I mentioned before everything works fine if the TV and amp are on
> before the computer boots, but there is an issue if they are switched on
> later (e.g. if it is recording).
>
> Any suggestions gratefully received.
>
> Regards,
> Andrew
>
>
> On Tue, Nov 11, 2014 at 7:08 PM, Andrew Wilkinson <
> andrewjwilkinson at gmail.com> wrote:
>
>> I'm using the inbuilt Intel graphics card using vaapi. It's got to be a
>> settings issue because it works fine provided the tv is turned on before it
>> boots.
>>
>> Andrew
>>
>>
>> On Tuesday, 11 November 2014, Peter Bennett (cats22) <cats22 at comcast.net>
>> wrote:
>>
>>>  On 11/10/2014 04:38 AM, Andrew Wilkinson wrote:
>>>
>>> Hi,
>>>
>>>  Since upgrading from Mythbuntu 12.04 to 14.04 I've had the issue where
>>> if booted without the tv being on then there is no signal when the tv is
>>> switched on. I've resolved the issue by disabling xfsettingsd and running a
>>> script that calls xrandr on hdmi connect. There is one remaining issue, and
>>> that's that after my script uses xrandr to turn on the screen MythTV plays
>>> all recordings at 30fps, making the sound higher pitched than usual. If the
>>> tv is on when the machine is booted the recordings play at 25 fps as usual.
>>>
>>>  Here is the xrandr output when the TV was on when booted:
>>>
>>>  Screen 0: minimum 320 x 200, current 1360 x 768, maximum 32767 x 32767
>>> VGA1 disconnected (normal left inverted right x axis y axis)
>>> HDMI1 disconnected (normal left inverted right x axis y axis)
>>> HDMI2 connected 1360x768+0+0 (normal left inverted right x axis y axis)
>>> 160mm x 90mm
>>>    1360x768       60.0*+
>>>    1920x1080i     60.1     50.0     60.0
>>>    1280x720       60.0     50.0     59.9
>>>    1024x768       60.0
>>>    800x600        60.3
>>>    720x576        50.0
>>>    720x480        60.0     59.9
>>>    640x480        60.0     59.9
>>>    720x400        70.1
>>> VIRTUAL1 disconnected (normal left inverted right x axis y axis)
>>>
>>>  And here's the start of the frontend log with -v playback, also when
>>> the TV was on when booted.
>>>
>>>  http://pastebin.com/A1DMTgqN
>>>
>>>  Here is the xrandr output from when the TV was turned off when the
>>> machine booted:
>>>
>>>  Screen 0: minimum 320 x 200, current 1360 x 768, maximum 32767 x 32767
>>> VGA1 disconnected (normal left inverted right x axis y axis)
>>> HDMI1 disconnected (normal left inverted right x axis y axis)
>>> HDMI2 connected 1360x768+0+0 (normal left inverted right x axis y axis)
>>> 160mm x 90mm
>>>    1920x1080i     60.1 +   50.0     60.0
>>>    1360x768       60.0*+
>>>    1280x720       60.0     50.0     59.9
>>>    1440x576       50.0
>>>    1024x768       60.0
>>>    1440x480       60.0     59.9
>>>    800x600        60.3
>>>    720x576        50.0
>>>    720x480        60.0     59.9
>>>    640x480        60.0     59.9
>>>    720x400        70.1
>>> VIRTUAL1 disconnected (normal left inverted right x axis y axis)
>>>
>>>  And here's the log with -v playback from when TV was off during boot.
>>>
>>>  http://pastebin.com/wBxuCP2M
>>>
>>>  As you can see in the second of these log outputs it is playing the
>>> video at 30fps, but earlier it correctly detects that the video is 25fps.
>>> Why? What can I do to get it to play at the correct speed?
>>>
>>>  Many thanks,
>>> Andrew
>>>
>>>
>>>  What video adapter do you have?
>>> I have had problems in the past of recordings playing at the wrong
>>> speed. I switched to an NVidia display adapter and use vdpau and have not
>>> had the problem since. I use the $20 Nvidia GeForce 210.
>>>
>>> Peter
>>>
>>>
>
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