[pulseaudio-discuss] Dropped xxx samples. This is most likely because downstream can't keep up and is consuming samples too slowly.

[Georg Chini]

On 13.02.22 16:57, corbeille wrote:
> Hello,
>
> I did some additional tests.
> And it seems the problem occurs when I have a second null sink. With
> only one null sink, I don't have any problem. Weird.
>
> So here is an example of the configuration that causes the problem :
>
> 1st shell:
> $ pacmd load-module module-null-sink sink_name=MySink
> $ pacmd load-module module-null-sink sink_name=MySink2
>
> 2nd shell:
> $ gst-launch-1.0 pulsesrc device="alsa_input.usb-0d8c_C-
> Media_USB_Headphone_Set-00.analog-mono" ! audioconvert ! audioresample
> ! pulsesink device=MySink
>
> 3rd shell:
> $ gst-launch-1.0 pulsesrc device=MySink.monitor ! audio/x-
> raw,channels=2 ! audioconvert ! audioresample ! opusenc ! oggmux !
> shout2send ip=... port=... mount=... password=...
>
> After 20 minutes, the sound becomes choppy and stop 4/5 minutes after.
>
> You can notice that I don't use the second null sink.
>
> Is it a normal behavior ? If so, how can I do to achieve this
> configuration on my RPi (by using multi null sink) :
>
> gst_input1 => MySink => gst output1
> gst_input2 => MySink2 => gst output2
>
> without any trouble ?
> Thanks.
> ++
>
> Jack
>
>
>
> Le vendredi 11 février 2022 à 21:33 +0100, corbeille a écrit :
>> Hello,
>>
>> I am using pulseaudio (version 12.2) to "join" two audio streams
>> created
>> with gstreamer (1.14.4) on a raspberry pi (Raspbian GNU/Linux 10
>> (buster)).
>>
>> Here the real things :
>>
>> In a first shell, i start with :
>> $ pacmd load-module module-null-sink sink_name=MySink
>>
>> Then I use gstreamer to get the sound from my audio input (in an
>> other
>> shell) :
>> $ gst-launch-1.0 pulsesrc
>> device="alsa_input.usb-0d8c_C-Media_USB_Headphone_Set-00.analog-mono"
>> !
>> audioconvert ! audioresample ! pulsesink device=MySink
>>
>> and I send this sound on an icecast server (in an other shell) :
>> $ gst-launch-1.0 pulsesrc device=MySink.monitor !
>> "audio/x-raw,channels=2" ! audioconvert ! audioresample ! opusenc !
>> oggmux ! shout2send ip=... port=... mount=... password=...
>>
>> Everything is fine, but after 10 minutes, I get in the 3rd shell ($
>> gst-launch-1.0 pulsesrc device=MySink.monitor ! ...) a sequence of
>> messages like :
>>
>> WARNING: from element /GstPipeline:pipeline0/GstPulseSrc:pulsesrc0:
>> Can't record audio fast enough
>> Additional debug info:
>> gstaudiobasesrc.c(849): gst_audio_base_src_create ():
>> /GstPipeline:pipeline0/GstPulseSrc:pulsesrc0:
>> Dropped 10080 samples. This is most likely because downstream can't
>> keep
>> up and is consuming samples too slowly.
>> WARNING: from element /GstPipeline:pipeline0/GstPulseSrc:pulsesrc0:
>> Can't record audio fast enough
>> Additional debug info:
>> gstaudiobasesrc.c(849): gst_audio_base_src_create ():
>> /GstPipeline:pipeline0/GstPulseSrc:pulsesrc0:
>> Dropped 34560 samples. This is most likely because downstream can't
>> keep
>> up and is consuming samples too slowly.
>> WARNING: from element /GstPipeline:pipeline0/GstPulseSrc:pulsesrc0:
>> Can't record audio fast enough
>> Additional debug info:
>> gstaudiobasesrc.c(849): gst_audio_base_src_create ():
>> /GstPipeline:pipeline0/GstPulseSrc:pulsesrc0:
>> Dropped 48000 samples. This is most likely because downstream can't
>> keep
>> up and is consuming samples too slowly.
>> ...
>>
>> The sound become glitchy and stop after 2 or 3 minutes.
>>
>> According to the message, the stream after "pulsesrc
>> device=MySink.monitor" is too slow. But I don't understand why.
>>
>> Do you know where is the problem in this setup and how to solve it ?
>> Thanks !
>> ++
>>
>> Jack
>>
Hello,

have you tried with a more recent version of pulseaudio? 12.2 is pretty
old. You should use 15.0 or current git.

Regards
        Georg