[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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Comment (by Jim Stichnoth <jstichnoth@…>):

 In [changeset:"c13b8361627f971cef10d47eb52445157f23eff6/mythtv"]:
 {{{
 #!CommitTicketReference repository="mythtv"
 revision="c13b8361627f971cef10d47eb52445157f23eff6"
 Add utility marks for preroll amount and latest playback position.

 ==== Program start:

 The recorder writes a mark of the new type MARK_UTIL_PROGSTART as soon
 as it encounters a keyframe close to the recording's scheduled start
 time.  This essentially skips past the preroll region and the "start
 early" region.

 The frontend 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).

 ==== Playback position:

 During playback, a timer event auto-saves the current playback frame
 with the new MARK_UTIL_LASTPLAYPOS mark type, every 30 seconds. The
 actual saving is done in a background thread to avoid playback
 glitches.  Saving is done only during active playback, i.e. not while
 paused.  The MARK_UTIL_LASTPLAYPOS mark is tidied up (cleared) if the
 user saves a bookmark while exiting playback.

 The "Play from..." menu gets a new item (a new translatable string):
     Play from last played position

 This item is added to the menu only when the recording markup actually
 contains a MARK_UTIL_LASTPLAYPOS mark.

 The motivation of MARK_UTIL_LASTPLAYPOS is that if you accidentally
 exit playback without setting a bookmark (or the frontend crashes, or
 the OS crashes, or ...), this allows you to resume roughly where you
 left off.  Because of the 30-second timer, if you start playing
 normally and realize you've made a mistake, you have 30 seconds to
 exit playback and instead "Play from last played position".

 Note that different frontends can fight over setting this mark, same
 as with a regular bookmark.

 Still to do:
 1. Preview generator can do less guessing about preroll.
 2. Provide MythVideo launcher with similar progstart/lastplaypos options.

 Refs #11713.
 }}}

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Ticket URL: <https://code.mythtv.org/trac/ticket/11713#comment:6>
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