[FFmpeg-trac] #4360(undetermined:new): -mbd 0 causes artifacts when encoding a specific video to MPEG-1

[FFmpeg]

#4360: -mbd 0 causes artifacts when encoding a specific video to MPEG-1
-------------------------------------+-------------------------------------
             Reporter:  ejlasota     |                     Type:  defect
               Status:  new          |                 Priority:  normal
            Component:               |                  Version:
  undetermined                       |  unspecified
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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 Summary of the bug:

 A specific sample video experiences heavy artifacts when transcoded to
 MPEG-1 video using -mbd 0 (or leaving it as default), even at very high
 bit rates.  -q:v 1 increases the severity.

 How to reproduce:

 Download this video:
 http://trailers.divx.com/divx_prod/profiles/Micayala_DivX1080p_ASP.divx

 Run this (used Zoranoe git-9d7e42e 64-bit static build)
 {{{
 % ffmpeg -i Micayala_DivX1080p_ASP.divx -b:v 30000k -bf 5 -report -y
 artifacts.m1v
 }}}

 Notice artifacts on the DivX logo animations and both the start and end of
 the video.

 Changing -b:v to 5000k or 30000k did not have any effect.  -q:v 1
 increased the severity.  The problem does not occur when using -mbd 1 or
 -mbd 2.

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Ticket URL: <https://trac.ffmpeg.org/ticket/4360>
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