[mythtv] Problems with Bob Playback

[Michael T. Dean]

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 
timestretch.

http://cvs.mythtv.org/trac/changeset/6723

Mike