Hi, I have a problem with module-rtp-recv.
On the sender side, I start with: pacmd load-module module-rtp-send format=s16be channels=2 rate=44100 source=NullSink.monitor On the receiver side, I start with: pacmd load-module module-rtp-recv On the receiver side I notice the following: - the value of "Buffer Latency" of the rtp-recv sink-input constantly increases, with a rate of approximately 100 ms per minute (so after 10 minutes there is roughly a 1 second delay between sender and receiver). - the value of "Sample Specification" of the rtp-recv sink-input shows "s16be 2ch 44011Hz", the value of the sink itself it is "s16le 2ch 44100Hz". So my speculation is that because of this difference of 99Hz between sink-input (44011Hz) and sink (44100Hz) there is samples "left over" that keep piling up and thus filling up the buffer. I tried to understand the logic in the source code of https://github.com/pulseaudio/pulseaudio/blob/master/src/modules/rtp/module-rtp-recv.c but failed. Below is a log excerpt of the pulseaudio daemon when loading module-rtp-recv: Dec 20 09:35:45 raspberrypi pulseaudio[1137]: Created 4 "UNIX socket client" Dec 20 09:35:45 raspberrypi pulseaudio[1137]: Loaded "module-rtp-recv" (index: #6; argument: ""). Dec 20 09:35:45 raspberrypi pulseaudio[1137]: CLI got EOF from user. Dec 20 09:35:45 raspberrypi pulseaudio[1137]: Freed 4 "UNIX socket client" Dec 20 09:35:49 raspberrypi pulseaudio[1137]: Negotiated format: pcm, format.sample_format = "\"s16be\"" format.rate = "44100" format.channels = "2" Dec 20 09:35:49 raspberrypi pulseaudio[1137]: Resampler: Dec 20 09:35:49 raspberrypi pulseaudio[1137]: rate 44100 -> 44100 (method speex-float-1) Dec 20 09:35:49 raspberrypi pulseaudio[1137]: format s16be -> s16le (intermediate float32le) Dec 20 09:35:49 raspberrypi pulseaudio[1137]: channels 2 -> 2 (resampling 2) Dec 20 09:35:49 raspberrypi pulseaudio[1137]: Choosing speex quality setting 1. Dec 20 09:35:49 raspberrypi pulseaudio[1137]: memblockq requested: maxlength=33554432, tlength=0, base=4, prebuf=0, minreq=1 maxrewind=0 Dec 20 09:35:49 raspberrypi pulseaudio[1137]: memblockq sanitized: maxlength=33554432, tlength=33554432, base=4, prebuf=0, minreq=4 maxrewind=0 Dec 20 09:35:49 raspberrypi pulseaudio[1137]: memblockq requested: maxlength=33554432, tlength=0, base=4, prebuf=0, minreq=1 maxrewind=0 Dec 20 09:35:49 raspberrypi pulseaudio[1137]: memblockq sanitized: maxlength=33554432, tlength=33554432, base=4, prebuf=0, minreq=4 maxrewind=0 Dec 20 09:35:49 raspberrypi pulseaudio[1137]: Created input 1 "RTP Stream (PulseAudio RTP Stream on netbook.zuhause)" on alsa_output.platform-bcm2835_audio.analog-stereo with sample spec s16be 2ch 44100Hz and channel map front-left,front-right Dec 20 09:35:49 raspberrypi pulseaudio[1137]: media.role = "stream" Dec 20 09:35:49 raspberrypi pulseaudio[1137]: media.name = "RTP Stream (PulseAudio RTP Stream on netbook.zuhause)" Dec 20 09:35:49 raspberrypi pulseaudio[1137]: rtp.session = "PulseAudio RTP Stream on netbook.zuhause" Dec 20 09:35:49 raspberrypi pulseaudio[1137]: rtp.origin = "makemkv 3912044479 0 IN IP4 192.168.2.15" Dec 20 09:35:49 raspberrypi pulseaudio[1137]: rtp.payload = "10" Dec 20 09:35:49 raspberrypi pulseaudio[1137]: memblockq requested: maxlength=41943040, tlength=41943040, base=4, prebuf=70568, minreq=0 maxrewind=0 Dec 20 09:35:49 raspberrypi pulseaudio[1137]: memblockq sanitized: maxlength=41943040, tlength=41943040, base=4, prebuf=70568, minreq=4 maxrewind=0 Dec 20 09:35:49 raspberrypi pulseaudio[1137]: Initialising GStreamer RTP backend for receive Dec 20 09:35:49 raspberrypi pulseaudio[1137]: Requested volume: front-left: 56210 / 86% / -4.00 dB, front-right: 56210 / 86% / -4.00 dB Dec 20 09:35:49 raspberrypi pulseaudio[1137]: Got hardware volume: front-left: 56210 / 86% / -4.00 dB, front-right: 56210 / 86% / -4.00 dB Dec 20 09:35:49 raspberrypi pulseaudio[1137]: Calculated software volume: front-left: 65536 / 100% / 0.00 dB, front-right: 65536 / 100% / 0.00 dB (accurate-enough=yes) Dec 20 09:35:49 raspberrypi pulseaudio[1137]: Volume not changing Dec 20 09:35:49 raspberrypi pulseaudio[1137]: alsa_output.platform-bcm2835_audio.analog-stereo: state: IDLE -> RUNNING Dec 20 09:35:49 raspberrypi pulseaudio[1137]: New session 'PulseAudio RTP Stream on netbook.zuhause' Dec 20 09:35:50 raspberrypi pulseaudio[1137]: Discontinuity detected, possibly lost some packets Dec 20 09:35:50 raspberrypi pulseaudio[1137]: Updating sample rate Dec 20 09:35:50 raspberrypi pulseaudio[1137]: wi=7188 ri=0 Dec 20 09:35:50 raspberrypi pulseaudio[1137]: Write index deviates by 7.19 ms, expected 500.00 ms Dec 20 09:35:50 raspberrypi pulseaudio[1137]: Estimated target rate: 40143 Hz, using average of 44021 Hz (α=0.020) Dec 20 09:35:50 raspberrypi pulseaudio[1137]: New rate of 42936 Hz not within 2‰ of 44100 Hz, forcing smaller adjustment Dec 20 09:35:50 raspberrypi pulseaudio[1137]: Updated sampling rate to 44011 Hz. Dec 20 09:35:50 raspberrypi pulseaudio[1137]: Requesting rewind due to end of underrun Dec 20 09:35:50 raspberrypi pulseaudio[1137]: Requested to rewind 17632 bytes. Dec 20 09:35:50 raspberrypi pulseaudio[1137]: Limited to 17376 bytes. Dec 20 09:35:50 raspberrypi pulseaudio[1137]: before: 4344 Dec 20 09:35:50 raspberrypi pulseaudio[1137]: after: 0 Dec 20 09:35:50 raspberrypi pulseaudio[1137]: Tried rewind, but was apparently not possible. Dec 20 09:36:05 raspberrypi pulseaudio[1137]: Checking for dead streams ... There are no further log entries regarding updates of the sampling rate, so maybe this is a bug in module-rtp-recv.c ? Regards, Chris.
