[FFmpeg-devel] Interlaced video processing

Michael Niedermayer michaelni
Sat Sep 22 17:43:30 CEST 2007


On Sat, Sep 22, 2007 at 02:20:18PM +0300, Maksym Veremeyenko wrote:
> Dear developers!
> I am trying to convert PAL MPEG-2/MJPG to PAL DV25 format (and visa-verse).
> Common PAL files has UpperFieldFist by DV want LowerFieldFirst - as 
> results of encoding I always got incorrect fields order.
> Option '-top X' do not help (none of values),
> trick '-croptop 1 -padbottom 1' do not work (due to all crop/pad
> operation should be mod2)
> What part of *ffmpeg* should carry about field order change/modify: 
> decoder,encoder,vhook?

you can implement a field delay, reorder, ... filter in libavfilter,
see soc-svn (libavfilter is not integrated into ffmpeg-svn yet)

Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

it is not once nor twice but times without number that the same ideas make
their appearance in the world. -- Aristotle
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