[mythtv-commits] Ticket #12256: Playback of MKVs with embedded-font subtitles irregular and jerky

[MythTV]

#12256: Playback of MKVs with embedded-font subtitles irregular and jerky
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 Reporter:  hardmann@…               |          Owner:  jyavenard
     Type:  Bug Report - General     |         Status:  new
 Priority:  minor                    |      Milestone:  unknown
Component:  MythTV - Video Playback  |        Version:  0.27.3
 Severity:  medium                   |     Resolution:
 Keywords:  subtitles mkv            |  Ticket locked:  0
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Old description:

> Playback of MKVs with "fansub" embedded SRT subtitles is jerky.  The main
> problem is pauses in playback, and/or subtitles displaying only for a
> split-second.
>
> After a bit of testing, it looks like it's something to do with the
> loading of the font or the rendering of the font for the subtitle.  The
> fonts were embedded into the MKV  - however I extracted the fonts too,
> installing them normally.  This did not seem to help at all.
>
> Example videos exhibiting this problem:
>     https://kickass.to/vivid-mushishi-zoku-
> shou-01-8902b060-mkv-t8961335.html
>
> Where the first few seconds of the musical-score subtitles cause
> jerkyness.
>
> These files play fine in VLC.

New description:

 Playback of MKVs with "fansub" embedded SRT subtitles is jerky.  The main
 problem is pauses in playback, and/or subtitles displaying only for a
 split-second.

 After a bit of testing, it looks like it's something to do with the
 loading of the font or the rendering of the font for the subtitle.  The
 fonts were embedded into the MKV  - however I extracted the fonts too,
 installing them normally.  This did not seem to help at all.

 These files play fine in VLC.

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Comment (by wagnerrp):

 Removed illegal file sharing link...

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Ticket URL: <https://code.mythtv.org/trac/ticket/12256#comment:1>
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