[FFmpeg-trac] #6916(undetermined:new): DVBSUB ==> DVDSUB width oversized (canvas_size issue ?)

FFmpeg trac at avcodec.org
Sat Dec 16 00:23:28 EET 2017

#6916: DVBSUB ==> DVDSUB width oversized  (canvas_size issue ?)
             Reporter:  Sami32       |                     Type:
               Status:  new          |  enhancement
            Component:               |                 Priority:  normal
  undetermined                       |                  Version:  git-
             Keywords:  DVDSUB       |  master
  canvas                             |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
 Summary of the bug:
 When converting DVBSUB to DVDSUB, the bitmap subtitle size is modified and
 become a slighly bigger size after been converted to DVDSUB. See the
 following images:
 https://ibb.co/btyDh6   (DVBSUB original)
 https://ibb.co/mxcnaR   (DVDSUB convertion)

 Sample used can be found here:

 How to reproduce:
 % ffmpeg -canvas_size 720x576 -fix_sub_duration -i
 "F:\!MEDIA_TEST_FILES\UMS Video Testing Suite (20150121)\TESTS\INTERNAL
 SUBTITLES\BDAV recorded video sample.ts" -c:v copy -c:a copy -c:s dvdsub
 -f matroska dvdsub.mkv

Ticket URL: <https://trac.ffmpeg.org/ticket/6916>
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