[mythtv] Jitterometer: Mixed progressive & interlaced frames?

[Markus Schulz]

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