I have recently installed squeezelite on some raspberry pi's, running LMS on a Windows machine. Server and clients on a wired network at home. Working very well but with some synchronisation issues. When I sync one player to the other I notice occasional small skips in the playback; enough to bother me. I have taken some care with my NTP setup to ensure that the client clocks are well synchronised (within 1ms of each other and within 3-4 ms of the server). With debug logging enabled on the server I see a lot of resync events in the logs (one every couple of seconds or so). It seems as though the server flip/flops between thinking one player is behind other (see extract below). First it decides that A is 40ms or so behind B and tells A to skip ahead; then a couple of seconds later it thinks B is behind A by a similar amount and tells B to skip ahead; and so on.
This looks to me like bad timing data or some kind of instability in the LMS sync algorithm, rather than jitter in the clients. I don't see any obvious problems with the sendSTAT code in squeezelite. The LMS code I don't understand very well. I'd be grateful for any suggestions how to get a better understanding of the underlying causes or how to improve this behaviour. Seb [14-06-24 16:39:14.0172] Slim::Player::StreamingController::_CheckSync (559) 00:13:ef:20:2d:21 resync: skipAhead 20ms [14-06-24 16:39:16.0194] Slim::Player::StreamingController::_CheckSync (559) 00:13:ef:20:2d:21 resync: skipAhead 19ms [14-06-24 16:39:18.7812] Slim::Player::StreamingController::_CheckSync (559) b8:27:eb:83:7f:a2 resync: skipAhead 39ms [14-06-24 16:39:20.7860] Slim::Player::StreamingController::_CheckSync (559) 00:13:ef:20:2d:21 resync: skipAhead 39ms [14-06-24 16:39:24.0050] Slim::Player::StreamingController::_CheckSync (559) 00:13:ef:20:2d:21 resync: skipAhead 31ms [14-06-24 16:39:26.0082] Slim::Player::StreamingController::_CheckSync (559) b8:27:eb:83:7f:a2 resync: skipAhead 70ms [14-06-24 16:39:28.0138] Slim::Player::StreamingController::_CheckSync (559) 00:13:ef:20:2d:21 resync: skipAhead 70ms [14-06-24 16:39:30.0156] Slim::Player::StreamingController::_CheckSync (559) b8:27:eb:83:7f:a2 resync: skipAhead 49ms [14-06-24 16:39:32.0025] Slim::Player::StreamingController::_CheckSync (559) 00:13:ef:20:2d:21 resync: skipAhead 49ms [14-06-24 16:39:34.0056] Slim::Player::StreamingController::_CheckSync (559) b8:27:eb:83:7f:a2 resync: skipAhead 70ms [14-06-24 16:39:36.0101] Slim::Player::StreamingController::_CheckSync (559) 00:13:ef:20:2d:21 resync: skipAhead 71ms [14-06-24 16:39:38.0062] Slim::Player::StreamingController::_CheckSync (559) b8:27:eb:83:7f:a2 resync: skipAhead 10ms [14-06-24 16:39:40.0110] Slim::Player::StreamingController::_CheckSync (559) b8:27:eb:83:7f:a2 resync: skipAhead 20ms [14-06-24 16:39:42.0126] Slim::Player::StreamingController::_CheckSync (559) b8:27:eb:83:7f:a2 resync: skipAhead 20ms [14-06-24 16:39:45.0686] Slim::Player::StreamingController::_CheckSync (559) b8:27:eb:83:7f:a2 resync: skipAhead 21ms [14-06-24 16:39:48.0041] Slim::Player::StreamingController::_CheckSync (559) 00:13:ef:20:2d:21 resync: skipAhead 70ms [14-06-24 16:39:50.0079] Slim::Player::StreamingController::_CheckSync (559) b8:27:eb:83:7f:a2 resync: skipAhead 70ms [14-06-24 16:39:52.0033] Slim::Player::StreamingController::_CheckSync (559) 00:13:ef:20:2d:21 resync: skipAhead 70ms [14-06-24 16:39:54.0054] Slim::Player::StreamingController::_CheckSync (559) b8:27:eb:83:7f:a2 resync: skipAhead 70ms ------------------------------------------------------------------------ seberoon's Profile: http://forums.slimdevices.com/member.php?userid=63052 View this thread: http://forums.slimdevices.com/showthread.php?t=97046 _______________________________________________ unix mailing list [email protected] http://lists.slimdevices.com/mailman/listinfo/unix
