[mythtv-commits] Ticket #9593: Teletext subtitles not working properly for Scandinavian Canal+ movie channels

[MythTV]

#9593: Teletext subtitles not working properly for Scandinavian Canal+ movie
channels
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 Reporter:  Jari Nevalainen <jari.nevalainen@…>  |          Owner:  markk
     Type:  Bug Report                           |         Status:
 Priority:  minor                                |  accepted
Component:  MythTV - General                     |      Milestone:  unknown
 Severity:  medium                               |        Version:
 Keywords:                                       |  0.24-fixes
                                                 |     Resolution:
                                                 |  Ticket locked:  0
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Comment (by markk):

 Jari - I've spent some time looking at this and I'm no closer to finding a
 fix. Can you confirm those subtitles work as expected when using a set top
 box or television?

 Notes:

 For a given magazine, a page starts with a page header, followed by a
 number of data packets and is considered complete when another page header
 for the same magazine is received.

 For the above clip, the Finnish subtitles are on magazine 6 and by and
 large there is only one page in that magazine (1689). Hence that magazine
 is only receiving page headers for that one page. For certain subs, a page
 header is received and is followed almost immediately by a data (subtitle)
 packet. The next page header is then not received for 3-4 seconds, at
 which point that subtitle is either then displayed only briefly or
 immediately replaced by the next.

 It looks like those subs should be displayed almost as they are received
 but they do not match the transmission model of header->packet->header.
 There are additional flags that we do not appear to do anything with -
 which may be the problem - or (less likely), the demuxer is presenting
 those packets out of order; which would explain the timing problem.

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Ticket URL: <http://code.mythtv.org/trac/ticket/9593#comment:3>
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