[MEncoder-users] Swap or not swap (fields)

[Rich Felker]

On Fri, Sep 22, 2006 at 01:54:45PM +0100, Dieter wrote:
> > And now the stupid question: is there a way of autodetect when the
> > fields are swapped and fix it automagically?
> 
> Look at the flag and hope it is set correctly.  The real problem is what
> to do when the flag changes every few frames.

This is a misleading way of looking at it. No player will play a DVD
where the field parity keeps swapping since there's no way to output
this to an interlaced device. What you're really seeing probably also
involves the repeat field frames and thus a sort of soft (or mixed
hard/soft) telecine.

Rich