[MPlayer-dev-eng] Re: -of mpeg

[Tobias Diedrich]

D Richard Felker III wrote:

> Very very strange. How on earth does vf_softpulldown work right,
> then?? It interprets top_field_first as what it should logically mean,
> not this repeat count nonsense...

The meaning of top_field_first depends on progressive_sequence:

> > and heres the MPEG2 standard:
> > ---
> > top_field_first   --   The   meaning   of   this   element   depends    upon
> > picture_structure, progressive_sequence and repeat_first_field.
> > If progressive_sequence is equal to '0', this flag indicates what  field  of
> > a reconstructed frame is output first by the decoding process:
> > In a field picture top_field_first shall have the value '0',  and  the  only
> > field output by the decoding process is the decoded field picture.
> > In a frame picture top_field_first being set to '1' indicates that  the  top
> > field of the reconstructed frame is the first field output by  the  decoding
> > process.  top_field_first being set to '0' indicates that the  bottom  field
> > of the reconstructed frame is the first field output by decoding process

So indeed vf_softpulldown will not work correctly on material where
progressive_sequence is set.  Note that there is both a
progressive_sequence flag (in the Sequence extension) and a
progressive_frame flag (in the Picture coding extension).

-- 
Tobias						PGP: http://9ac7e0bc.2ya.com
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