[FFmpeg-trac] #3832(avfilter:new): support frame metadata in idet filter

[FFmpeg]

#3832: support frame metadata in idet filter
-------------------------------------+-------------------------------------
               Reporter:  dericed    |                  Owner:
                   Type:             |                 Status:  new
  enhancement                        |              Component:  avfilter
               Priority:  wish       |               Keywords:  idet,
                Version:  git-       |  metadata
  master                             |               Blocking:
             Blocked By:             |  Analyzed by developer:  0
Reproduced by developer:  0          |
-------------------------------------+-------------------------------------
 Summary of the enhancement:

 I would find it useful if the idet filter set frame metadata similar to
 how cropdetect, signalstats, and ebur128 do.

 How to reproduce:
 {{{
 ffprobe -f lavfi mandelbrot,idet -show_frames
 }}}

 For frame metadata I suggest lavfi.idet.mfd and lavfi.idet.sfd. Perhaps
 the output of
 {{{
 ffprobe -f lavfi movie=INPUT,idet -show_entries frame_tags=lavfi.idet.mfd
 }}}
 could be

 {{{
 [FRAME]
 TAG:lavfi.idet.mfd=Undetermined
 [/FRAME]
 [FRAME]
 TAG:lavfi.idet.mfd=BFF
 [/FRAME]
 [FRAME]
 TAG:lavfi.idet.mfd=Progressive
 [/FRAME]
 [FRAME]
 TAG:lavfi.idet.mfd=TFF
 [/FRAME]
 }}}

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Ticket URL: <https://trac.ffmpeg.org/ticket/3832>
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