[mythtv-users] Video quality on 0.28 worse than it was on 0.21

[Allen Edwards]

As the subject line suggests, playback is perfect on this exact same
hardware with 0.21 and is terrible with 0.28.  The video driver is
different.  Everything else I am able to check is the same.  I can just
switch the HD without touching anything in the hardware and the playback is
smooth as silk.  It is almost unwatchable with 0.28.

If it is true that the video driver won't make a difference, then I need to
go back to 8.04.  I find that difficult to believe.  Perhaps there is some
other setting, maybe in the backend, I am missing that is different. But
the playback is terrible even when the backend isn't doing anything except
sourcing a recording.

The card is a 6200.  I misspoke saying it was a 6600.

Allen

On Fri, Aug 24, 2018 at 8:02 AM, Stephen Worthington <
stephen_agent at jsw.gen.nz> wrote:

> On Fri, 24 Aug 2018 07:20:58 -0700, you wrote:
>
> >Clearly the drivers were not installed correctly as shown
> >*configuration: driver=nouveau latency=0*
> >
> >And
> >*more: stat of /etc/modprobe.d/nvidia-graphics-drivers.conf failed: No
> such
> >file or directory*
> >
> >I installed using the GUI that was something like Other Drivers, an option
> >that somehow disappeared from the menu but shows up under the software
> >update tab now.
> >
> >Initially I autoinstalled the 340 driver, which was a disaster for the
> 8600
> >card. I then purged the system and installed the 304 driver manually,
> still
> >had issues and went back to the 6200 card, which worked better but clearly
> >the nvidia drivers are not there.
> >
> >I saw instructions to use the Administrator tab to finish the install but
> I
> >don't have that tab so I went to the tab that lists the driver options and
> >saw that 304 was listed and checked as installed and the the nouveau was
> >there as an option.  I then selected the nouveau and installed that
> >followed by selecting the 304 and reinstalling it.  I thought that would
> >allow the system to do a proper install but obviously I was wrong.
> >
> >The only thing I can think of at this point is to purge the system of
> >nevidia drivers and then do the autoselect again with the 6200 card so
> that
> >the 304 driver will be selected.
> >
> >Allen
>
> I just looked up the 6600 in the Nvidia documentation, and as expected
> it does not support VDPAU at all.  So with that card, there is no
> point in installing the Nvidia drivers.  The 8600GT supports VDPAU
> feature set A, which means it can do most of what MythTV wants, except
> probably not the best deinterlacing modes.
>
> Note that in order to use VDPAU, as well as installing the Nvidia
> drivers, you have to configure mythfrontend to use a VDPAU mode.  See
> the MythTV Wiki for the setup for this.  Without configuring
> mythfrontend for VDPAU, output will be relying on the CPU only to do
> the processing and the results will be bad on 720p or above unless the
> CPU is new enough and powerfull enough to cope.
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