> ?? Why 50 frames per second ??
> My understanding of setting FIELD_PARITY is, that in case of 
> SetFieldParity(0),
> the actual buffer flip is at frame boundary (top field first), whereas with
> SetFieldParity(1) (bottom field first) the buffer flip happens at half frame.

Yes absolutely.

I was trying to think up reasons why it might be going wrong.  If you
_don't_ use FIELD_PARITY, you can send 50 deinterlaced frames per
second and it'll work.  If that was what the up-stream code was doing,
it would explain why it goes wrong when FIELD_PARITY is enabled.  I've
never looked at vdr/softdevice so I'm entirely in the dark about what
it might be doing, that was just a thought.

> But streams I've seen have 25 frames /sec (frame with to fields in 
> interlaced).

Indeed they do.  If you're saying that vdr/softdevice works only with
frames and doesn't do any deinterlacing itself then that's that one
off the list of possibilities.

Mark

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