[mythtv-commits] Ticket #11713: add mythical bookmark at the scheduled start of programme (to automatically skip preroll)

[MythTV]

#11713: add mythical bookmark at the scheduled start of programme (to automatically
skip preroll)
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 Reporter:  dekarl              |          Owner:  stichnot
     Type:  Developer Task      |         Status:  accepted
 Priority:  minor               |      Milestone:  0.27.5
Component:  MythTV - Recording  |        Version:  Unspecified
 Severity:  medium              |     Resolution:
 Keywords:                      |  Ticket locked:  0
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Changes (by stichnot):

 * owner:  dekarl => stichnot
 * status:  new => accepted


Comment:

 After some more thought, here's the current plan.

 Add a new value MARK_UTIL_PREROLL to MarkTypes.

 RecorderBase::SavePositionMap() writes this mark as soon as it encounters
 a keyframe close to the recording's scheduled start time.

 The frontend PBB starts playback from this keyframe if the user selects
 Play and there is no explicit bookmark (but not if the user selects one of
 the "Play from..." menu items).


 I also want another "utility mark" mechanism:

 Add a new value MARK_UTIL_PLAYPOS to MarkTypes.

 The TV class (tv_play.cpp) adds a timer event that auto-saves the current
 playback frame with this mark type every 30 seconds.  The actual saving is
 done in a background thread to avoid playback glitches.

 The "Play from..." menu gets a new item:
   Play from last played position

 If you accidentally exit playback without setting a bookmark (or
 mythfrontend crashes, or the OS crashes, or ...), this allows you to
 resume roughly where you left off.

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Ticket URL: <https://code.mythtv.org/trac/ticket/11713#comment:4>
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