[mythtv-commits] Ticket #13532: Slow drift in a/v sync on non-nVidia system

MythTV noreply at mythtv.org
Wed Dec 11 20:22:23 UTC 2019


#13532: Slow drift in a/v sync on non-nVidia system
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 Reporter:  jpilk                 |          Owner:  mark-kendall
     Type:  Bug Report - General  |         Status:  accepted
 Priority:  minor                 |      Milestone:  needs_triage
Component:  MythTV - General      |        Version:  Master Head
 Severity:  medium                |     Resolution:
 Keywords:  a/v sync              |  Ticket locked:  0
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Comment (by jpilk):

 OK, my "Peston v Johnson" test recording has previously shown serious
 lipsync problems in el7. I have just played it again and no a/v drift was
 noticeable.

 Frame dropping was reported "quite often", particularly when I was
 reloading Thunderbird, and CPU load, usually 2 x 85%, seems high for SD.
 The log sample below looks as if sensible things are happening.  I'm not
 sure that the recording does.

 Commit 234f34b0

 OSD shows Codec/Dec MPEG-2 ffmpeg, CPUs 2 x (2.80 GHz) ~85%, Deint 2x CPU
 onefield

 {{{
 2019-12-11 19:36:32.119275 I  Player(1): FPS:   25.01 Mean: 39987 Std.Dev:
 1237 CPUs: 88% 82%
 2019-12-11 19:36:33.119052 I  Player(1): FPS:   25.01 Mean: 39980 Std.Dev:
 660 CPUs: 80% 86%
 2019-12-11 19:36:33.671667 I  Player(1): AV Sync: Audio ahead by 33 ms
 2019-12-11 19:36:33.709330 I  Player(1): AV Sync: Audio ahead by 32 ms
 2019-12-11 19:36:33.746729 I  Player(1): AV Sync: Audio ahead by 30 ms
 2019-12-11 19:36:33.785031 I  Player(1): AV Sync: Audio ahead by 27 ms
 2019-12-11 19:36:33.821721 I  Player(1): dropping frame to catch up,
 lateness=31845 usec
 2019-12-11 19:36:33.892225 I  Player(1): AV Sync: Audio behind by 27 ms
 2019-12-11 19:36:33.936415 I  Player(1): AV Sync: Audio behind by 24 ms
 2019-12-11 19:36:34.116205 I  Player(1): FPS:   25.08 Mean: 39875 Std.Dev:
 10713 CPUs: 88% 83%
 2019-12-11 19:36:35.119459 I  Player(1): FPS:   24.93 Mean: 40118 Std.Dev:
 802 CPUs: 86% 84%
 2019-12-11 19:36:36.119252 I  Player(1): FPS:   25.01 Mean: 39980 Std.Dev:
 599 CPUs: 86% 81%

 }}}

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Ticket URL: <https://code.mythtv.org/trac/ticket/13532#comment:5>
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