[mythtv] Problems with Bob Playback

Michael T. Dean mtdean at thirdcontact.com
Sun Jan 15 20:57:09 UTC 2006

Martin Ebourne wrote:
> On Sat, 14 Jan 2006 21:12:05 -0500, Michael T. Dean wrote:
>> Martin Ebourne wrote:
>>> Anything other than timestretch 1.0 works great, just at 1.0 it is
>>> broken. 
>> If using timestretch, bob deinterlacing is disabled, so that would explain
>> why you don't see the problem with timestretch.  :)
> Yes, that is certainly implicated. But then something else is still going
> on because with bob on and timestretch other than 1.0 the picture is
> clearly being deinterlaced somehow - with bob off completely (from the
> settings page) scrolling text has a comb effect at any timestretch, but
> with bob on and timestretch in action there is no comb.
> Actually, looking at the picture some more I think I can see what's
> happening. With bob on and timestretch active the vertical resolution
> appears to be halved, so I guess it's doing one-field deinterlacing
> instead. That would explain the lack of shake.
Yes.  If you have enabled bob deinterlacing, you've told Myth that you 
want deinterlacing, however bob only works at certain multiples of the 
frame rate, so Myth falls back to one-field deint when you turn on 



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