[pulseaudio-discuss] Pulseaudio latency

Georg Chini georg at chini.tk
Sun Jul 29 16:07:22 UTC 2018

On 29.07.2018 18:03, Georg Chini wrote:
> On 29.07.2018 12:44, Harish Gaddameedi wrote:
>> Hi Georg,
>> I was working on simple Openwrt Platform, and Source device is 
>> Android phone Bluetooth with Youtube app 24 hrs live streaming video 
>> and alsa device is speaker, which is hardwired
>> The 12 hrs testing which i did on pulseaudio-11.1 are without my 
>> modification. The basic modification which i made in the previous 
>> pulseaudio-8.0 is with the idle state of bluez_source card (i.e., 
>> card is vanishing when the song is in the pause state) and did some 
>> changes to buffers of pulseaudio to reduce the latency. But in 
>> pulseaudio-11.1 i didn't do all the changes as i didn't find any 
>> initial latency. but periodic latency after 12hrs still exists. The 
>> issue is reproducible with Gstreamer also.
>> I haven't worked on microphone scenarios, I'm just working on music 
>> player and speaker.
>> Let me clear you some test scenarios for better understanding,
>> Case 1: Android phone as source (bluez_source) and device with 
>> internal speaker (alsa-sink as sink for pulseaudio) -------> delay 
>> after 12hrs exists.
>> Case 2: Device with Gstreamer as source and same device with internal 
>> speaker (pulsesink with alsa card as sink for pulseaudio) ----------> 
>> delay after 12 hrs exists.
>> Case 3: Device with Gstreamer as source and External Bluetooth 
>> speaker (pulsesink with bluez_sink card) -----------> No delay after 
>> 12 hrs.
> What output does module-loopback give when you run with debugging?
> Do you see the growing latency there? Does it show up with pactl list 
> sinks
> or pactl list sources? Any error messages in the PA log?
> Regards
>              Georg
One more comment: It may well be worth trying 12.2 because the bluetooth 
function has changed.
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