[mythtv-users] Deinterlacing svideo

[Paul Gardiner]

Allen Edwards wrote:
> When using my CRT-TV through SVideo I get these messages:
> "Video sync method can't support double framerate (refresh rate too low 
> for bob deint)"
> 
> I seem to remember this is caused by the system looking for 60Hz or 
> above and seeing 59.9Hz due to some round off error or lack of round off.
> 
> I also seem to remember someone saying there was a fix for this.
> 
> I have searched 6 months of archives but can't seem to find any 
> references so maybe I was imagining the discussion.
> 
> I don't really have a problem with my system, my problem at the moment 
> is my back went out reading my email this morning (could have something 
> to do with working in odd positions all day yesterday) so I have too 
> much time on my hands.  It has thus occurred to me that this was a 
> hanging problem for which I have not found a solution.

There are two problems in this area. One is the rounding problem you
mention, the other is MythTv interpreting interlaced display modes
as 30Hz rather than 60Hz (or 25/50 for PAL). If it's the latter then
have a look at Ticket #2903. The patch in Ticket #2903 may not work
if your modeline doesn't explicitly have the "interlace" key word.
I'm not sure what you should do in that circumstance.

If you get this working, you should be able to use yadif and you'll
see a huge difference. You may also want to look at Ticket #6391.
Under the right conditions that'll beat yadif.

Cheers,
	Paul.