[MPlayer-dev-eng] Re: -of mpeg
ranma at gmx.at
Wed Oct 22 14:59:21 CEST 2003
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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