[mythtv] AVSync in master, Normal decoding, vga monitor and built-in audio analog stereo

[John Pilkington]

Hi Mark, Peter, Tim et al...

I'm now running b5edda1b06e, today's master, under el7 with hardware as 
in the subject.

A recording that allows good sensory evaluation of a/v sync shows 
noticeable drift that is not evident from the -v playback log.

The same recording plays with perfect a/v sync via the MythTV DLNA 
server on my TV

This sample of the log shows a higher rate of frame-dropping than the 
average for that recording.  It suggests to me that the result of 
dropping a frame may not be getting through to the sync filter input.  I 
first reported sync drift on 16 Nov, and IIRC I first noticed it a day 
or two earlier.  AVSync2 increment is 1 ms.

HTH,

John P

{{{

2019-12-09 18:19:49.635638 I  Player(5): dropping frame to catch up, 
lateness=39890 usec
2019-12-09 18:19:49.793242 I  Player(5): dropping frame to catch up, 
lateness=38490 usec
2019-12-09 18:19:49.832012 I  Player(5): AV Sync: Audio ahead by 28 ms
2019-12-09 18:19:49.960731 I  Player(5): dropping frame to catch up, 
lateness=48985 usec
2019-12-09 18:19:49.988455 I  Player(5): AV Sync: Audio ahead by 24 ms
2019-12-09 18:19:50.054778 I  Player(5): AV Sync: Audio ahead by 24 ms
2019-12-09 18:19:50.116016 I  Player(5): dropping frame to catch up, 
lateness=47266 usec
2019-12-09 18:19:50.156979 I  Player(5): AV Sync: Audio ahead by 33 ms
2019-12-09 18:19:50.216963 I  Player(5): dropping frame to catch up, 
lateness=30218 usec
2019-12-09 18:19:50.378709 I  Player(5): dropping frame to catch up, 
lateness=32955 usec
2019-12-09 18:19:50.542979 I  Player(5): dropping frame to catch up, 
lateness=38217 usec
2019-12-09 18:19:50.700887 I  Player(5): dropping frame to catch up, 
lateness=37134 usec
2019-12-09 18:19:50.861823 I  Player(5): dropping frame to catch up, 
lateness=39076 usec
2019-12-09 18:19:51.015041 I  Player(5): dropping frame to catch up, 
lateness=32288 usec
2019-12-09 18:19:51.172908 I  Player(5): dropping frame to catch up, 
lateness=31159 usec
2019-12-09 18:19:52.062073 I  Player(5): AV Sync: Audio behind by 1 ms
2019-12-09 18:19:52.889115 I  Player(5): AV Sync: Audio ahead by 24 ms
2019-12-09 18:19:52.921252 I  Player(5): AV Sync: Audio ahead by 23 ms
2019-12-09 18:19:52.992925 I  Player(5): FPS:   24.94 Mean: 40102 
Std.Dev: 18410 CPUs: 91% 91%
2019-12-09 18:19:56.984290 I  Player(5): FPS:   25.06 Mean: 39909 
Std.Dev:  1221 CPUs: 81% 78%
2019-12-09 18:20:00.984315 I  Player(5): FPS:   25.00 Mean: 39996 
Std.Dev:  1200 CPUs: 80% 79%
2019-12-09 18:20:01.868788 I  Player(5): dropping frame to catch up, 
lateness=66031 usec
2019-12-09 18:20:01.901175 I  Player(5): AV Sync: Audio ahead by 57 ms
2019-12-09 18:20:01.940942 I  Player(5): AV Sync: Audio ahead by 39 ms
2019-12-09 18:20:01.977668 I  Player(5): AV Sync: Audio ahead by 35 ms
2019-12-09 18:20:02.011394 I  Player(5): AV Sync: Audio ahead by 29 ms
2019-12-09 18:20:02.045813 I  Player(5): AV Sync: Audio ahead by 24 ms

)))