[mythtv] AVSync2 Refinements

David Engel david at istwok.net
Mon Dec 16 05:21:54 UTC 2019

On Sat, Dec 14, 2019 at 03:00:24PM +0000, Mark Kendall wrote:
> On Fri, 13 Dec 2019 at 18:21, Tim Pletcher <pletchtd at gmail.com> wrote:
> >
> >
> >> I was able to do a little more testing today and figured out how to nicely parse the log playback,timestamp data into a comma-delimited file to enable me to look more closely at some real data.
> >>
> >> First, I found that a 0.4 gain and 0.9 filter as I initially proposed does work well.
> >
> >
> > Apologies Mark.
> >
> > I just noticed you already committed the 0.04.  I don't mean to appear so indecisive on this :)   I think it is probably splitting hairs at this point as the control seems to work pretty good with either settings.
> Tim
> No problem. I'm minded to go back to 0.4 as it generally seems a
> little slow to respond at the moment.

Count me firmly in the 0.4 camp.  I didn't see much difference with
progressive content yesterday but did today with interlaced content.
0.04 takes noticably longer to settle down.


> With respect to deinterlacers, hopefully the extra jitter you've
> demonstrated is just a result of system load (in this case GPU rather
> than CPU).
> The VAAPI/VPP deinterlacers use FFmpeg/libavfilter code to run. These
> will only return deinterlaced frames when they have seen at least 2
> frames as they need multiple frames to work with. Hence there should,
> in theory, be a 1 frame delay inherent in the filter. The same applies
> to the OpenGL/shader kernel deinterlacer. It is that delay that I want
> to feed back to the player.
> The EDID data that is present in most modern displays is a set of
> static figures that indicate to the connected device how long it takes
> to process video frames prior to display. It just needs to be checked
> once at the start of playback.
> Regards
> Mark
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David Engel
david at istwok.net

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