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

[Stefano Sabatini]

On date Friday 2011-04-08 12:10:32 +0100, Mark Himsley encoded:
> On 31/03/11 08:47, Mark Himsley wrote:
> >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.
> >
> >format=yuv422p,crop=720:575:0:1,pad=720:576:0:0:black
> >
> >but that chain does not fill the remaining line.
> 
> New version attached.
> 
> removes bitstream formats from the accepted list of formats
> hopefully addresses Stefano's usability nit's
> makes tff the default
> implements Stefano's suggestion for accepting string values in input
> implements using av_image_get_linesize() to find the number of bytes
> of video in a line
> updated docs

Looks OK but for a few nits and typos I'll address when committing the
patch. I note that most/all non-paletted bitstream formats should be
already supported by the implemented logic, but this can be added with
another patch if you have no interest in supporting them.
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