[FFmpeg-trac] #3019(avfilter:reopened): fieldmatch + decimate causes out-of-sync audio

[FFmpeg]

#3019: fieldmatch + decimate causes out-of-sync audio
-------------------------------------+-------------------------------------
             Reporter:               |                    Owner:
  spookybathtub                      |                   Status:  reopened
                 Type:  defect       |                Component:  avfilter
             Priority:  normal       |               Resolution:
              Version:  git-master   |               Blocked By:
             Keywords:  pullup       |  Reproduced by developer:  0
  decimate                           |
             Blocking:               |
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
Changes (by Detergent):

 * status:  closed => reopened
 * resolution:  fixed =>
 * reproduced:  1 => 0


Comment:

 Hi, reopening this issue as I have this problem in 2.7.1 with another
 29,97i file. Here's an extract :

 https://drive.google.com/file/d/0Bz_fz7x43dCZanJxUE9tVVF1R0k/view?usp=sharing

 The command I used was the following :


 {{{
 ffmpeg -i TD-trim.ts -vf fieldmatch,yadif=deint=interlaced,decimate
 -vcodec libx264 -preset faster -acodec copy out.mkv
 }}}


 What seems to happen is that too many frames are dropped, and the result,
 while tagged as 23,976p, is accelerated and causes out-of-sync audio. Same
 thing without the yadif filter.

 I also tested this command with the NCIS-trim.ts file attached here and it
 works fine, so there's another problem.

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Ticket URL: <https://trac.ffmpeg.org/ticket/3019#comment:18>
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