[mythtv] Jitterometer: Mixed progressive & interlaced frames?

[Mark Buechler]

Thanks for your reply. I had no idea that providers were doing that. I have
been forcing the deinterlacer on in these cases.

I've been thinking of patching Myth for this type of content but the only
way I could think to do so would be to increase the threshold but that
really doesn't fix the problem as much as hide it.

- Mark.

On 11/26/07, Markus Schulz <msc at antzsystem.de> wrote:
>
> Am Montag, 26. November 2007 schrieb Mark Buechler:
> > Has anyone seen a case where jitterometer claims to see a constant
> > mix of interlaced and progressive frames? Many of my channels, which
> > I would consider interlaced, show up in Myth's logs as:
> >
> > 2007-11-26 12:01:03.976 NVP: interlaced frame seen after 59
> > progressive frames
> > 2007-11-26 12:01:03.976 Enabled deinterlacing
> > 2007-11-26 12:01:04.326 NVP: progressive frame seen after 11
> > interlaced frames
> > 2007-11-26 12:01:04.393 Disabled deinterlacing
> > 2007-11-26 12:01:04.559 NVP: interlaced frame seen after 7
> > progressive frames
> > 2007-11-26 12:01:04.559 Enabled deinterlacing
> > 2007-11-26 12:01:04.726 NVP: progressive frame seen after 6
> > interlaced frames
> > 2007-11-26 12:01:04.793 Disabled deinterlacing
> > 2007-11-26 12:01:04.976 NVP: interlaced frame seen after 7
> > progressive frames
> > 2007-11-26 12:01:04.976 Enabled deinterlacing
> > 2007-11-26 12:01:05.326 NVP: progressive frame seen after 11
> > interlaced frames
> > 2007-11-26 12:01:05.393 Disabled deinterlacing
> > 2007-11-26 12:01:05.493 NVP: interlaced frame seen after 5
> > progressive frames
> > 2007-11-26 12:01:05.493 Enabled deinterlacing
> > 2007-11-26 12:01:05.793 NVP: progressive frame seen after 11
> > interlaced frames
> > 2007-11-26 12:01:05.859 Disabled deinterlacing
> > ...
> >
> > Is such a thing practical? I'm certain it's possible to have mix of
> > both but I can't imagine why anyone would want to do so. Is
> > jitterometer correct here?
>
> yes, it's normal, i have them too. The tv-broadcaster can encode a mix
> of interlaced and progressive frames to get maximum quality. You should
> manually force "interlaced" from playback menu for this type of
> channels/broadcasts. Especially for adaptive deinterlacer with frame
> historie the playback was ugly if you don't do this.
> And yes, there is something todo with myth AutoDeint function(it's on my
> todo).
>
> --
> Markus Schulz
>
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