I am using a Raspberry Pi as a "sound server". Essentially, the RPI is connected to the actual audio hardware. The RPI advertises itself via module-native-protocol-tcp and module-zeroconf-publish. My desktop/workstation in turn uses the RPI for playback via module-tunnel. Everything seems to work as expected, except there is a noticeable lag between doing something on the PC, and having the audio "catch up" on the RPI. For example, watching YouTube - the audio and video are out of sync to the point of being unwatchable. Or using a simple audio player on the PC, hitting "play" or "stop", there is a noticeable delay from when the button is pressed to when the action actually takes effect. I can't think of a good way to measure the lag, but I'm guessing it's around half to three fourths of a second. To be clear, there are no stutters or skips or other audio artifacts. Playback is smooth and sounds as good as I expect - but the lag is a problem. What's interesting is, this is actually the second RPI sound server I've built. The first one had this lag, but to a much smaller degree, as in, barely noticeable. The differences between the systems are: the first (barely noticeably lag) is an RPI 4, connected to a Topping D70 DAC. The new system (with the obvious latency issue) is an RPI 3, connected to an MA12070P-based amplifier. IOW, the RPI hardware and audio hardware are different. But the network is the same, and the devices are all in the same physical location (i.e. same cable length). The RPI 3 does have only 100mbps network, and the RPI 4 has gigabit. The rest of the network chain is all gigabit. These are all hardwired networks (i.e. no wireless). I feel like 100mbps is more than sufficient for CD-quality audio. The RPI isn't running any other services or doing any other work. Any thoughts on how I might track this down? Or what config options I can play with to see if it improves the situation? Also, as the RPI is headless, I can't think of a good way to determine if the latency is on the RPI itself, or comes from the network between the PC and RPI. Thanks! _______________________________________________ pulseaudio-discuss mailing list pulseaudio-discuss@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/pulseaudio-discuss
