[mythtv-users] intermittent error starting mythfrontend on Raspberry PI OS 64 bit

[Jim Abernathy]

On 12/14/21 11:57 AM, James Abernathy wrote:
>
>  I have tried to simplify the key part of the command from this:
>
> QT_QPA_EGLFS_ALWAYS_SET_MODE="1" QT_QPA_PLATFORM=eglfs 
> QT_QPA_EGLFS_DEBUG=1 QT_LOGGING_RULES=qt.qpa.*=true 
> QT_QPA_EGLFS_KMS_CONFIG=/home/pi/pi_mythfrontend.json mythfrontend 
> $ARGUMENTS
>
> to this:
>
> QT_QPA_EGLFS_ALWAYS_SET_MODE="1" QT_QPA_PLATFORM=eglfs 
> QT_QPA_EGLFS_DEBUG=1 QT_LOGGING_RULES=qt.qpa.*=true mythfrontend 
> $ARGUMENTS
>
> It runs, but the CONFIG is defaulting to my UHD 4K parameters so the 
> FPS jitter goes from +/-0.03 to  +/- 1.29. and the picture is no 
> longer smooth. With the config it's supposed to make it 1080P. When it 
> works it's great.
>
> Jim A
>

If I switch the RPI4 over to a 1080p FHD TV and just run:

QT_QPA_EGLFS_ALWAYS_SET_MODE="1" QT_QPA_PLATFORM=eglfs mythfrontend

It works fine with very good FPS jitter.  So the culprit seems to be 
something is the way the QT_QPA_EGLFS_KMS_CONFIG=...json part of the 
command is working to cause the error.

Jim A


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