[mythtv-users] Bob and TV-Out: refresh rate too low

Thomas Börkel thomas at boerkel.de
Sun Aug 24 12:31:16 UTC 2008


HI!

Allen Edwards wrote:

> I saw this on my system as well but assumed that since S-Video was
> interlaced, why would you de-interlace it.  Is this a problem?

You are right. That would be the ideal solution. Otherwise MythTV
deinterlaces an originally interlaced signal and then the TV encoder of
the gfx card interlaces it again.

The problem is, the NVidia driver will only passthrough the original
interlaced signal, if you have the correct TV resolution and even then
it does not work with all driver versions.

But when I use the correct resolution (720x576) for PAL, then the driver
outputs ca. 60 Hz and I don't know why.

So, the 2nd best solution would be to have 800x600 with exactly 50 Hz,
which worked in older driver versions, and use Bob. Unfortunately, newer
driver versions use (or at least report) 49.99 Hz and then MythTV
refuses to use Bob.

Thomas


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