[mythtv-commits] Ticket #12990: Playback jitter deinterlaced media

MythTV noreply at mythtv.org
Mon Feb 6 03:26:47 UTC 2017

#12990: Playback jitter deinterlaced media
     Reporter:  blm-ubunet@…         |      Owner:  jyavenard
         Type:  Patch - Bug Fix      |     Status:  new
     Priority:  minor                |  Milestone:  29.0
    Component:  MythTV - Video       |    Version:  Master Head
  Playback                           |   Keywords:  jitter playback
     Severity:  medium               |  interlaced
Ticket locked:  0                    |
 High jitter for playback of double framerate deinterlaced video media.
 The frame delay is not calculated correctly for double frame rate
 deinterlaced playback so the AVSync oscillates wildly.

 See Ticket #11246 https://code.mythtv.org/trac/ticket/11246 for history.
 The patch from 11246 worked because typically the monitor refreshrate is
 >= double frame rate (field --> frame) of deinterlaced video. I think the
 actual fault was same as described by this ticket.

 New patch attached,
 Have tested (eyeballs on screen) with display refreshrates of 50 & 60Hz &
 range of international video samples of progressive & interlaced from 24p
 to 120p.
 When display rate == video rate, playback is jitter free (prog &
 Viewing i50 on 60Hz display is pretty good even for watching motorsport.

Ticket URL: <https://code.mythtv.org/trac/ticket/12990>
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