[pulseaudio-discuss] Audible plop at beginning when using pcat-simple

[mindfsck]

I seem to be to silly for it:
# sox in.wav -r 22050 out.wav resample
sox FAIL formats: can't open input file `out.wav': No such file or directory

Of course there is no out.wav since that's what I want to create!

On Fri, Aug 27, 2021 at 4:28 PM guest271314 <guest271314 at gmail.com> wrote:

> What happens when you resample to 22050?
>
> On Fri, Aug 27, 2021 at 7:18 AM mindfsck <mindfsck at gmail.com> wrote:
>
>> Why is the sample rate set to 48000?
>>>
>>
>> No idea! The sourcing of the file is outside of my hands..
>>
>> On Fri, Aug 27, 2021 at 4:14 PM guest271314 <guest271314 at gmail.com>
>> wrote:
>>
>>> Why is the sample rate set to 48000?
>>>
>>> On Fri, Aug 27, 2021 at 6:40 AM mindfsck <mindfsck at gmail.com> wrote:
>>>
>>>> Thanks Sean. I unloaded the suspend module but the plop is still there.
>>>> I don't really think it is HW related since the file plays just fine
>>>> with paplay and aplay.
>>>>
>>>> On Fri, Aug 27, 2021 at 5:49 AM Sean Greenslade <
>>>> sean at seangreenslade.com> wrote:
>>>>
>>>>> On Thu, Aug 26, 2021 at 09:43:23PM +0200, mindfsck wrote:
>>>>> > Hi there,
>>>>> >
>>>>> > I was using this example to simply play a WAV file without having
>>>>> much clue
>>>>> > of audio:
>>>>> >
>>>>> https://www.freedesktop.org/software/pulseaudio/doxygen/pacat-simple_8c-example.html
>>>>> > I changed the sources to match (IMHO) my settings, i.e. channels=1
>>>>> and
>>>>> > rate=48000.
>>>>> >
>>>>> > I have two wavefiles, the first plays as it should (compared with
>>>>> command
>>>>> > line paplay or aplay) and the second one has an audible PLOP (but
>>>>> only
>>>>> > around 90% of the time) at the very beginning of playback:
>>>>> >
>>>>> > (1 - OK)
>>>>> > General
>>>>> > Complete name                            : out_clean.wav
>>>>> > Format                                   : Wave
>>>>> > File size                                : 81.3 KiB
>>>>> > Duration                                 : 866 ms
>>>>> > Overall bit rate mode                    : Constant
>>>>> > Overall bit rate                         : 769 kb/s
>>>>> > Audio
>>>>> > Format                                   : PCM
>>>>> > Format settings                          : Little / Signed
>>>>> > Codec ID                                 : 1
>>>>> > Duration                                 : 866 ms
>>>>> > Bit rate mode                            : Constant
>>>>> > Bit rate                                 : 768 kb/s
>>>>> > Channel(s)                               : 1 channel
>>>>> > Sampling rate                            : 48.0 kHz
>>>>> > Bit depth                                : 16 bits
>>>>> > Stream size                              : 81.2 KiB (100%)
>>>>> >
>>>>> > (2 - NOK)
>>>>> > General
>>>>> > Complete name                            : out_short_clean.wav
>>>>> > Format                                   : Wave
>>>>> > File size                                : 22.8 KiB
>>>>> > Duration                                 : 242 ms
>>>>> > Overall bit rate mode                    : Constant
>>>>> > Overall bit rate                         : 772 kb/s
>>>>> > Audio
>>>>> > Format                                   : PCM
>>>>> > Format settings                          : Little / Signed
>>>>> > Codec ID                                 : 1
>>>>> > Duration                                 : 242 ms
>>>>> > Bit rate mode                            : Constant
>>>>> > Bit rate                                 : 768 kb/s
>>>>> > Channel(s)                               : 1 channel
>>>>> > Sampling rate                            : 48.0 kHz
>>>>> > Bit depth                                : 16 bits
>>>>> > Stream size                              : 22.8 KiB (100%)
>>>>> >
>>>>> > I tried using different BUFSIZE and my systemload is also not an
>>>>> issue...
>>>>> > Any ideas?
>>>>>
>>>>> I've experienced something like this with a few built-in audio cards on
>>>>> various laptops. It's never bothered me enough to track it down, but I
>>>>> suspect it's due to the suspending and resuming of cards. Can you try
>>>>> disabling the autosuspend module and see if it still happens? Use this
>>>>> command to temporarily disable it until the next time pulse reloads:
>>>>>
>>>>> $ pactl unload-module module-suspend-on-idle
>>>>>
>>>>> --Sean
>>>>>
>>>>>
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