[mythtv-commits] Ticket #11137: Misformed Captions/subtitles

[MythTV]

#11137: Misformed Captions/subtitles
----------------------------------+----------------------------
 Reporter:  jens@…                |          Owner:  stichnot
     Type:  Bug Report - General  |         Status:  accepted
 Priority:  minor                 |      Milestone:  unknown
Component:  MythTV - Captions     |        Version:  0.25-fixes
 Severity:  medium                |     Resolution:
 Keywords:  Captions misformed    |  Ticket locked:  0
----------------------------------+----------------------------

Comment (by stichnot):

 This appears to be a problem with a heuristic mismatch between handbrake
 and ffmpeg.  When the video does not have an explicit palette for the
 bitmap subtitle colors, ffmpeg tries to guess a reasonable palette,
 consisting of grayscale values evenly spaced between black and white.

 Unfortunately, this guess does not match the apparent intent of the
 subtitle author, and the interior color ends up being gray instead of
 white, and the border ends up a combination of white and black instead of
 gray and black.  (Between 0.25 and 0.26, ffmpeg reversed the order of
 guessed colors, resulting in the white and black being swapped, but the
 interior color is still gray.)

 I don't know Handbrake, but the best option for now would be if you could
 convince Handbrake to produce explicit palette information.

 I considered closing this ticket as an Upstream Bug, but I will wait until
 I can figure out how vlc gets it right.

-- 
Ticket URL: <http://code.mythtv.org/trac/ticket/11137#comment:9>
MythTV <http://code.mythtv.org/trac>
MythTV Media Center