[FFmpeg-devel] H.264 + PAFF: BBC HD recording shows extreme interlacing artefacts

Michael Niedermayer michaelni
Sun Oct 28 21:06:55 CET 2007


On Sun, Oct 28, 2007 at 07:46:07PM +0100, Reinhard Nissl wrote:
> Hi,
> Michael Niedermayer schrieb:
> >>> no, there is no problem with decoding, the problem is in the yv12->rgb
> >>> convertion, the fields have to be converted seperately not like a frame
> Is this a general rule, 


> i. e. should this also be the case for MPEG2
> frames when flag "interlaced_frame" is set?

yes in theory, in practice IIRC these flags are often set incorrectly by
the encoder

> Besides colorspace conversion, is it correct to assume that a frame is
> progressive when interlaced_frame is not set, i. e. could it be that a
> progressively coded image will show interlace artefacts (and should
> therefore be sent through a deinterlacer)?

yes of course, it all depends on how broken the encoder (and user using
the encoder) is


Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

While the State exists there can be no freedom; when there is freedom there
will be no State. -- Vladimir Lenin
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