[FFmpeg-trac] #2970(avcodec:open): White line in top macroblock of dvvideo

FFmpeg trac at avcodec.org
Tue Oct 14 14:10:56 CEST 2014

#2970: White line in top macroblock of dvvideo
             Reporter:  cehoyos        |                    Owner:
                 Type:  defect         |                   Status:  open
             Priority:  normal         |                Component:  avcodec
              Version:  git-master     |               Resolution:
             Keywords:  dvvideo dvdec  |               Blocked By:
             Blocking:                 |  Reproduced by developer:  1
Analyzed by developer:  1              |
Changes (by kurosu):

 * analyzed:  0 => 1
 * keywords:  dvvideo => dvvideo dvdec


 The error is indeed in the weight table for interlaced blocks, and should
 impact the decoding of any such content. I haven't checked the encoder.

 On the other hand, the weight tables for 8x8 and 2x4x8 (non-HD) have
 values somewhat diverging from the mathematical ones. I wonder if that
 would be related to simple idct, but on the other hand they are not the
 inverse of what the encoder use.

Ticket URL: <https://trac.ffmpeg.org/ticket/2970#comment:3>
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