[mythtv] Incessant flip/flop of deinterlacer in svn

Tom Dexter digitalaudiorock at gmail.com
Sun Oct 18 16:47:21 UTC 2009

On Sat, Oct 17, 2009 at 3:33 PM, Tom Dexter <digitalaudiorock at gmail.com> wrote:
> On Thu, Sep 17, 2009 at 2:04 AM, Mark Kendall <mark.kendall at gmail.com> wrote:
>> Try this patch for size:-
>> http://mythtv.pastebin.ca/1569343
>> regards
>> Mark
> I was going to try replacing my hack (which actually sets the
> m_scan_locked) with a change like changeset 22121 (I'm still on
> 0.21-fixes), but I'm a little confused by that change.
> If I'm interpreting that patch correctly, it will still switch to
> progressive if it sees four or more progressive frames after any
> interlaced frames.  The verbose message it generates says "Locking
> scan to Interlaced", but it appears that, after it does that, four
> progressive frames will in fact cause it to switch.
> Am I reading that correctly?  Has anyone verified that this sufficient
> to prevent the constant switching for (for example) NBCs dramas that
> tend to do this?  I'm using the new field order deinterlacer which is
> unusable if this switching occurs.
> Thanks.
> Tom

I went ahead and tested this change on my 0.21-fixes install.  I've
attached the patch I used which needed to be modified slightly for

So far it appears to work great.  I tried watching NBC stuff (a few
episodes of Heros) and I don't see any switching at all using verbose

Looks great.  Thanks for the fix Mark!

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