[FFmpeg-trac] #6734(avfilter:new): vidstabtransform bicubic interpolation issue

[FFmpeg]

#6734: vidstabtransform bicubic interpolation issue
-------------------------------------+-------------------------------------
             Reporter:  oregszun     |                     Type:  defect
               Status:  new          |                 Priority:  normal
            Component:  avfilter     |                  Version:  git-
             Keywords:  libvidstab   |  master
  bicubic                            |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 Summary of the bug:

 Using vidstabtransform with '''bicubic''' interpolation causes white
 atrtefacts on low exposure pixels. (no, linear, bilinear interpolation
 works well!)

 How to reproduce:
 {{{
 $ ffmpeg -y -i ./VI000290.mp4 -vf
 vidstabtransform=optalgo=gauss:maxangle=0.12566370614:interpol=bicubic:maxshift=54:smoothing=30:optzoom=0:zoom=0:input=./VI000290-stab.trf:crop=keep,pp=al:f
 -vcodec utvideo ./VI000290-stab.avi

 ffmpeg version N-87306-g6743351 Copyright (c) 2000-2017 the FFmpeg
 developers
 built with gcc 7.2.0 (GCC)
 configuration: --disable-static --enable-shared --enable-gpl --enable-
 version3 --enable-cuda --enable-cuvid --enable-d3d11va --enable-dxva2
 --enable-libmfx --enable-nvenc --enable-avisynth --enable-bzlib --enable-
 fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass
 --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libfreetype
 --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug
 --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb
 --enable-libopenh264 --enable-libopenjpeg --enable-libopus --enable-
 librtmp --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-
 libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-amrwbenc
 --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp
 --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid
 --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib
 libavutil      55. 75.100 / 55. 75.100
 libavcodec     57.106.101 / 57.106.101
 libavformat    57. 82.100 / 57. 82.100
 libavdevice    57.  8.101 / 57.  8.101
 libavfilter     6.105.100 /  6.105.100
 libswscale      4.  7.103 /  4.  7.103
 libswresample   2.  8.100 /  2.  8.100
 libpostproc    54.  6.100 / 54.  6.100
 }}}

--
Ticket URL: <https://trac.ffmpeg.org/ticket/6734>
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