epoch1970 wrote: > Something I did to find the "right" value of player audio delay: I > created an AIFF file with alternating 2secs L/R tones, for a total > length of 60 secs. > I set an SB3 to play only the right channel, [I wanted to do the > opposite with the software player but I always got both channels output] > I half-unplugged the audio cord on my Airport Express to output the left > channel only. > Then I synced the group, played the file in loop and fiddled with the > audio delay slider on the software player. > Until you reach the right value to your setup and ears, you'll hear a > silence gap and/or both sources at the same time. > To my surprise, the right value for this device was around 400ms (nearly > 50ms higher than I thought) > I don't know what you think of the idea but if felt I needed some help > in assessing the right audio delay. > > EDIT. Since we are knee-deep into psychoacoustics, another remark, but > within the same post ;) > I have 1 source to the left of a small room where I am sitting and 1 > source on the right, nearby. Speaker systems are *not* the same. Sync is > perfect but I can feel the "stage" shifting from left to right (and > back) from time to time. Yeah, I know that's scary... I think (not > verified) this is related to 10ms player sync adjustment events within > LMS. 10ms is the minimum value in the web interface. Is it possible to > go lower? > Please disregard if this doesn't make sense.
There is another option which is to indicate to LMS that each "sampling point" are not 'fully' accurate and must be averaged out. This is an option you can set when the player is being registered. The result is probably that LMS will do adjustement more slowly but that would prevent that effect from happening. Today, I can't do below 10ms as I'm using "sample point" every 8 ms to LMS, so ther accuracy is +/-8ms. Again, mean is centered but if you take every point for an accurate value, then LMS might do shift a bit too often (you can see in the log that there are often adjustement of "skip 441 frames = 441/44100 = 10ms) LMS 7.7.5 - 5xRadio, 3xBoom, 4xDuet, 1xTouch, 1 SB2. Sonos 2xPLAY:1, PLAY:3, PLAY:5, Marantz NR1603, JBL OnBeat, XBMC, Foobar2000, XBoxOne, JRiver 21, Chromecast Audio, Chromecast v1, Pi B2, Pi B+, 2xPi A+, Odroid-C1, Cubie2 ------------------------------------------------------------------------ philippe_44's Profile: http://forums.slimdevices.com/member.php?userid=17261 View this thread: http://forums.slimdevices.com/showthread.php?t=105198 _______________________________________________ plugins mailing list [email protected] http://lists.slimdevices.com/mailman/listinfo/plugins
