[FFmpeg-devel] [PATCH] add fieldorder video filter

Mark Himsley mark at mdsh.com
Thu Mar 31 09:47:38 CEST 2011

Second version of this filter. Renamed and updated from the suggestions 
given for the first version.

Converting to and from interlaced PAL DV files, with their 
bottom-field-first interlace field order, can be a pain. Converting tff 
files to DV results in tff DV files, which are hard to work with in 
editing software.

The attached filter can:

Convert field order by either moving all of the lines in the picture up 
by 1 line (bff to tff conversion) or down by 1 line (tff to bff 
conversion). The remaining line, the bottom line in bff to tff 
transforms or the top line in tff to bff transforms, is filled by 
copying the closest line in that field.

Previous to this filter I have used a filter chain like this to do bff 
to tff conversion.


but that chain does not fill the remaining line.

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