[mythtv-commits] Ticket #1941: Incorrect (slow) OSD program durations for some (not all) 1080i recordings

[MythTV]

#1941: Incorrect (slow) OSD program durations for some (not all) 1080i recordings
----------------------------+-----------------------------------------------
 Reporter:  ylee at pobox.com  |       Owner:  ijr 
     Type:  defect          |      Status:  new 
 Priority:  minor           |   Milestone:      
Component:  mythtv          |     Version:  0.19
 Severity:  low             |  
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 *All* HD recordings from the 1080i premium-movie channels I subscribe to
 (HBO HD, Showtime HD, CineMAX HD, Starz! HD) have incorrect recording
 lengths. A two-hour recording will typically show a total recording time
 of about one hour and 40 minutes, although the recording is complete with
 no missing chunks (jumping to the last minute of the movie's OSD length
 does properly takes me to the last minute of the actual recording). For
 example, a snippet of _The Paper_ recorded from Showtime HD that,
 according to my watch, took 30 seconds to play, will according to the OSD
 have taken about 26 seconds.

 This issue does *not* occur with recordings from any other source, whether
 1080i/720p broadcast-network affiliates (including movies they broadcast
 in HD), 1080i all-HD channels like HDNet/HDNet movies and Discovery HD, or
 analog cable channels. Even more peculiarly, this also does not occur with
 other video on the affected premium-movie channels; for example, with a
 just-recorded recording of _Robin Hood: Prince of Thieves_ (150-minute
 recording the OSD says is two hours and 16 minutes long), the commercials
 for other movies ahead of the movie itself, at the top of the recording,
 all play with proper elapsed time, but the movie itself plays with the
 aforementioned slow OSD time.

 I presume the isue has something to do with the difference between films'
 24fps and the NTSC/HD 29.97fps refresh rates, but am puzzled by why this
 is only an isue with the aforementioned 1080i channels but not the others.
 I suppose this could be related to #1693 but I have never seen OSD times
 doubled.

 This is an issue I've noticed since first setting up my MythTV box six
 months ago, on 0.18.1, and has continued through 0.19 and 0.19.1 (all
 through the ATrpms packages). The recordings are, again, complete, and
 otherwise play fine at the normal speed. They are *not* sped up in any
 way; I've tried playing the affected recordings at 0.8X time,
 approximating the 24/29.97 difference, and that's clearly too slow. (If it
 matters, I use Bob deinterlacing, but I use it everywhere, including the
 recordings from the sources without this issue.)

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Ticket URL: <http://svn.mythtv.org/trac/ticket/1941>
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