[FFmpeg-trac] #3968(documentation:open): fieldmatch does not work for mixed telecined and progressive content (was: fieldmatch with decimate generates out-of-sync video)

FFmpeg trac at avcodec.org
Mon Sep 22 19:15:52 CEST 2014


#3968: fieldmatch does not work for mixed telecined and progressive content
-------------------------------------+-------------------------------------
             Reporter:  myleal       |                    Owner:
                 Type:  defect       |                   Status:  open
             Priority:  minor        |                Component:
              Version:  git-master   |  documentation
             Keywords:  fieldmatch   |               Resolution:
             Blocking:               |               Blocked By:
Analyzed by developer:  0            |  Reproduced by developer:  1
-------------------------------------+-------------------------------------
Changes (by cehoyos):

 * status:  new => open
 * reproduced:  0 => 1
 * component:  undetermined => documentation
 * priority:  normal => minor
 * version:  unspecified => git-master
 * keywords:   => fieldmatch


Comment:

 For future tickets: Please always test current FFmpeg git head, nothing
 else is supported both here and on the user mailing list.

 The content is mixed progressive and telecined (actually 20 seconds
 telecined Fox Intro followed by a progressive movie), this does not work
 with fieldmatch currently, it requires cfr input: This seems not
 documented (although known),

 The following is supposed to produce perfect output, it unfortunately
 doesn't work correctly:
 {{{-vf fps=30000/1001,fieldmatch,decimate}}}

 I suggest you either use the pullup filter or cut the Intro (or brutally
 edit it with {{{-fps}}} or {{{-r}}}).

--
Ticket URL: <https://trac.ffmpeg.org/ticket/3968#comment:3>
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