Re: [BUG] Some tvtime deinterlacing methods ignore TFF flag

On Mon, 21 Jul 2003, Billy Biggs wrote:

> James Slorach (jrs47@xxxxxxxx):
> 
> > The following tvtime deinterlacing methods produce very jerky output...
[snip]
> > 
> > This appears to be because they operate on whole frames, but ignore the 
> > TFF flag, getting the fields in the wrong order.
[snip]
> 
>   This will probably be more difficult than it should be because of the
> way I have written the processing function.  It's not hard to fix, and I'd
> rather do it than have Miguel do it, but whichever of us does it first...

I've just noticed that the same problem (field order ignored) also affects 
3:2 pulldown detection.

On a DVD which is partially encoded as progressive and partially 
interlaced, the field order in the interlaced sections can be top or 
bottom field first. The interlaced sections which have the top field first 
work ok with the 3:2 pulldown detection. The interlaced sections which 
have the bottom field first continually jump in and out of film mode (and 
suffer from the deinterlacing problem mentioned above).

Presumably the merging of fields from different frames (once 3:2 pulldown 
has been detected) also needs to take account of field order.


James



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