[FFmpeg-trac] #4785(avfilter:new): Decimate filter doesn't work when used directly with fieldmatch

FFmpeg trac at avcodec.org
Wed Aug 19 16:27:11 CEST 2015


#4785: Decimate filter doesn't work when used directly with fieldmatch
-------------------------------------+-------------------------------------
             Reporter:  Detergent    |                     Type:  defect
               Status:  new          |                 Priority:  normal
            Component:  avfilter     |                  Version:  2.7
             Keywords:  fieldmatch,  |               Blocked By:
  decimate, ivtc                     |  Reproduced by developer:  0
             Blocking:               |
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 Hello,

 For a lot of telecined inputs, using '-vf fieldmatch,decimate' will not
 work and the result will have too many dropped frames that will result in
 accelerated playback (leading to audio desync).

 Now, the weird part is the following. This will not work :


 {{{
 ffmpeg -i input.1080i.ts -vf fieldmatch,decimate -vcodec libx264 out.mkv
 }}}

 '''However''', this command will work flawlessly :

 {{{
 ffmpeg -i input.1080i.ts -vf fieldmatch -f yuv4mpegpipe - | ffmpeg -i -
 -vf decimate -vcodec libx264 out.mkv
 }}}

 You can download a telecined sample that will reproduce the problem using
 the above commands here :
 https://drive.google.com/file/d/0Bz_fz7x43dCZT2tvZi1kZXJ0TUk/view?usp=sharing

 I am using FFmpeg 2.7.2 and used MPC-HC 1.7.9 to play the outputs.

--
Ticket URL: <https://trac.ffmpeg.org/ticket/4785>
FFmpeg <https://ffmpeg.org>
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