[mythtv] Swapping from Inerlaced -> Progressive channels "Slow Motion"

Michael T. Dean mtdean at thirdcontact.com
Thu Mar 9 08:57:28 UTC 2006


On 03/09/2006 03:33 AM, Matthew Moore wrote:
> I have asked this question on the user list without success so thought it  
> time to bring it to the big-person's list ;-)
>
> In Australia, 576P is classed as "High Definition" and whilst IMHO there  
> is little benefit to swapping from the SD resolution of 576i to 576p, I  
> really do want the Dolby Digital that is (sparingly) used on these  
> broadcasts.
>
> My problem is that if I have been watching an interlaced resolution  
> (either 576i or 1080i) then switch to a progressive scan channel, the  
> movement looks like slow motion.  Almost like Myth is still expecting an  
> interlaced picture so is only showing every second frame.  Audio stays in  
> sync and has no quality issues.
>
> If Myth starts on the progressive scan station it works perfectly.   
> Recordings also seem to function ok - this seems to be a live-tv only  
> problem.
>
> I have previously seen other discussions of my problem around the time of  
> the big DVB patch here:   
> http://www.gossamer-threads.com/lists/mythtv/dev/104050?search_string=seven%20hd%20slow;#104050   
> and my posting to the users list is here:   
> http://www.gossamer-threads.com/lists/mythtv/users/187422?search_string=540p;#187422
>
> It has been suggested that I disable deinterlacing, but this doesn't fix  
> the problem.  I also know that this isn't Australian-specific as a  
> respondant in my previous post has this problem with 720P broadcasts in  
> the US.
>
> I'm keen to help debug the problem but have absolutely no idea on where to  
> start and what information to capture.
>
> Can anyone suggest where to begin?
>   

It seems that David Asher is working a patch that would handle this 
perfectly for you.  
http://www.gossamer-threads.com/lists/mythtv/commits/188592#188592

I don't know what to suggest in the interim, though...  :)

Mike


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