[pulseaudio-discuss] Crackling Audio in Pulseaudio RTP Stream

[NicoHood]

Hi Chris,
I've checles that, but on archlinux I have speexdsp 1.2.1, but the 
problem still occurs :(

Any other idea?

On 20/02/2023 12:40, Chris Beat wrote:
> On 19/02/2023 20:10, NicoHood wrote:
>> Hey Sean
>> as I said I've setup pulseaudio via paprefs. I've enabled the RTP 
>> receiver and the sender with a
>> loopback device. Basically I've checked all 4 checkboxes in the 
>> paprefs RTP menu.
>>
>> And as I said, it also happens on the local host itself. I am also 
>> receiving (playing) the sound on
>> the device that is the sender, via the loopback functionality. And 
>> thatswhy there is no lan/wifi
>> issue, as it is completely local. But I use LAN anyways everywhere.
>>
>> @Chris (from the other mail), I am also using puldeaudio 16.1 on 
>> ArchLinux, but sadly it does not
>> fix it for me. :( Maybe you can find the bug report?
> 
> 
> I found it, and also figured out again, why it was so difficult to find 
> ... it was *not* directly a
> pulseaudio bug, but a bug in the libspeexdsp1 library, which also only 
> affected a minority use case
> involving e.g. Raspberries (if I understood correctly):
> 
> https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=799176
> 
> I followed the advise of the Debian maintainer at the end of the bug 
> report:
> 
> "Version: 1.2.0-1
> 
> I believe this bug is fixed with latest unpatched speexdsp upload.
> 
> Thanks,
> Boyuan Yang"
> 
> and installed the latest version of "libspeexdsp1" and I *think* that 
> solved the problem for me.
> 
> For reference ... in the debian bug report, they are referring to this 
> commit:
> https://gitlab.xiph.org/xiph/speexdsp/-/commit/0e5d424fdba2fd1c132428da38add0c0845b4178
> 
> ... you will problably have to check when/if this was incorporated into 
> your distribution's version
> of the library ... assuming that you ARE hit by the same bug as me ... 
> could as well be something
> completely different.
> 
> 
>>
>> On 19/02/2023 07:46, Sean Greenslade wrote:
>>> On Sat, Feb 18, 2023 at 08:44:21PM +0100, NicoHood wrote:
>>>> Hey Guys,
>>>> I am using pulseaudio for years now, but since Version 14, maybe 15 
>>>> there is
>>>> a crackling in the rtp stream. I've setup RTP just with paprefs, 
>>>> enable the
>>>> sender and local receiver on a separate audio device.
>>>>
>>>> I know that I am reporting this really late and the bug is there for 
>>>> some
>>>> years now. I hoped this gets eventually fixed, but it did not. I am 
>>>> using
>>>> the latest archlinux pulseaudio.
>>>>
>>>> Are you guys aware of the issue, does it also happen to you? It is 
>>>> just a
>>>> tiny crackling, but you can hear in on good audio boxes. It sound a 
>>>> bit like
>>>> the vinyl sound, just not so often. You can hear it on the sender via
>>>> loopback and on all other receivers as well.
>>>
>>> Can you describe your setup in more detail? It's unclear if you're using
>>> pulseaudio as the RTP sender, RTP receiver, or both.
>>>
>>> Occasional audible crackling is usually due to buffer underruns. Are
>>> your RTP streams going over a wireless network? If so, have you tried
>>> increasing the jitter buffer size on the receiver?
>>>
>>> --Sean
>>>