[FFmpeg-user] fieldmatch "marked as interlaced" -- doesn't work

[Paul B Mahol]

On Sun, Mar 14, 2021 at 11:18 PM Mark Filipak (ffmpeg) <markfilipak at bog.us>
wrote:

> On 2021-03-14 10:47, Mark Filipak (ffmpeg) wrote:
> > I hoped that "marked as interlaced" [1] meant that
> >
> >
> 'select=expr=not(eq(interlace_type\,TOPFIRST)+eq(interlace_type\,BOTTOMFIRST))'
> [2]
>
> Have I made myself understood? Do you see the problem?
>
> ...progressive.&.scan-int.here... 'select' ...only.progressive.here...
>
> But scan-interlace frames are getting through the 'select'.
>
> Either,
> 1, 'select' is broken, or
> 2, 'fieldmatch' is broken, or
> 3, 'fieldmatch' is setting a different flag (not 'interlace_type').
>
4, Missing more than half of information to give actual correct conclusion.

>
> How do I proceed?
>
> > would work. However, the 'select' doesn't work. I'm counting on the
> 'select' working -- not working
> > is a complete show stopper.
> >
> > Is there some other species of "marked as interlaced" that will make the
> 'select' work?
> >
> > Thanks,
> > Mark.
> >
> > [1] From https://ffmpeg.org/ffmpeg-filters.html#fieldmatch
> > "The separation of the field matching and the decimation is notably
> > motivated by the possibility of inserting a de-interlacing filter
> > fallback between the two. If the source has mixed telecined and real
> > interlaced content, fieldmatch will not be able to match fields for
> > the interlaced parts. But these remaining combed frames will be
> > *marked as interlaced*, and thus can be de-interlaced by a later
> > filter such as yadif before decimation."
> >
> > [2] From https://ffmpeg.org/ffmpeg-filters.html#select_002c-aselect
> > "interlace_type (video only)
> > "    The frame interlace type. It can assume one of the following values:
> > "    PROGRESSIVE
> > "        The frame is progressive (not interlaced).
> > "    TOPFIRST
> > "        The frame is top-field-first.
> > "    BOTTOMFIRST
> > "        The frame is bottom-field-first."
>
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