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

FFmpeg trac at avcodec.org
Mon Dec 17 15:44:12 EET 2018

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

Comment (by ablinne):

 I have just encountered this exact bug. Those white pixels are probably
 due to an integer underflow in the interpolation routine. A bit strange
 that this happens, because my source material is in the limited 16-235
 luma range. Maybe this should be reported upstream at
 https://github.com/georgmartius/vid.stab?. I work around the issue by
 compressing the luma range a bit further before applying the filter and
 expanding it back afterwards. However, this introduces a little bit of
 quantization noise.

Ticket URL: <https://trac.ffmpeg.org/ticket/6734#comment:2>
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