[mythtv-users] Caveats in upgrading from Ubuntu 18.04 + MythTV 29.1 to something newer?

Will Dormann wdormann at gmail.com
Tue Apr 25 14:24:28 UTC 2023

On 4/24/23 11:59 PM, Stephen Worthington wrote:
> I find this interesting, as I am very sensitive to deinterlacing
> problems and have not had this happen to me.  I have been using both
> VDPAU and NVDEC at times on the 525 drivers and can see no difference
> between them, except for the NVDEC drivers supporting more 4K files
> than VDPAU, and NVDEC not supporting some older video files.  I do not
> remember any difference in the deinterlacing as I moved through the
> driver versions from 390 upwards.  I am using Nvidia GT1030 cards.

Yeah, I can't rule out that it may be hardware-specific.  In my case 
it's a GeForce GT 730.  I happened to have a horizontally-panning scene 
on the TV at the time, and it was distractingly flickering.

Given that the broken-for-reasons-I-didn't-get-around-to-figuring-out 
6200ch channel changer was the more-pressing deal breaker, I'll admit 
that I didn't spend a whole lot of time poking around with the 
deinterlacing issues.  The fact that manually running 6200ch worked fine 
from a shell, but not as expectd when invoked from MythTV sure was a 
head scratcher for me.  Could be as simple as a race condition between 
the channel changing being sent out over firewire and the HD-PVR 
starting to record.  I did notice that the HD-PVR started recording 
before 6200ch actually completes (tested via adding e.g. a 10-second 
sleep to the channel changer).  That's about the point where the time I 
had sunk into looking at it had exceeded the value of being on a recent 
Ubuntu version.  :)

But after reverting back to my backup that had the 390 Nvidia drivers, 
it's back to smooth / non-flickering / no evidence of having been 


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