[mythtv-commits] Ticket #13334: Improved Video timing and Synchronization

MythTV noreply at mythtv.org
Mon Oct 29 23:18:20 UTC 2018

#13334: Improved Video timing and Synchronization
 Reporter:  Peter Bennett            |          Owner:  Peter Bennett
     Type:  Patch - Feature          |         Status:  assigned
 Priority:  minor                    |      Milestone:  30.0
Component:  MythTV - Video Playback  |        Version:  Master Head
 Severity:  medium                   |     Resolution:
 Keywords:                           |  Ticket locked:  0

Comment (by jpilk):

 I have been using master 1af2764 today, mainly in Fedora 28 with vdpau
 advanced, and mainly on UK DVB-T .ts recordings or edited recordings in
 mplex -f 9 (DVD profile without nav packets).  I've also viewed some
 processed DVB-T2 HD content.

 Playback of all of these was excellent, and I tried some with modest
 speedup.  Here are a few minor comments.

 In the online editor, playback from an editpoint starts with 'AV Sync
 audio ahead by' around -500 ms, after which the number falls rapidly.  I
 didn't see or hear any artefacts.

 Stepping backwards in the editor by single frames doesn't really work.
 This may not be a direct result of this commit. Stepping forwards is ok.
 For years I have been editing DVB content at keyframes and feel no need to

 Sometimes playback does not exit cleanly at EoF; the picture stays on
 screen and the 'audio ahead' number gets more and more negative.

 And playing the .iso image taken from my favourite defective DVD (#13326)
 showed no obvious event at the point where playback of the actual DVD
 still fails...

Ticket URL: <https://code.mythtv.org/trac/ticket/13334#comment:6>
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