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

[mindfsck]

or use 'vlc' or use any Video/Audio playback you have on your machine.Sigh,
I may just reach out for alternative APIs instead of trying to convince
people that this might be a bug in the simple API you provide.

On Sun, Aug 29, 2021 at 6:53 PM mindfsck <mindfsck at gmail.com> wrote:

> I repeat myself...use 'paplay' or 'aplay' and the result is fine.
>
> On Sun, Aug 29, 2021 at 6:31 PM guest271314 <guest271314 at gmail.com> wrote:
>
>> How do we know what the expected result is?
>>
>> On Sun, Aug 29, 2021 at 5:01 AM mindfsck <mindfsck at gmail.com> wrote:
>>
>>> you could try is making use of the buffering attributes in
>>>> pa_simple_new. Specifically, setting prebuf to a suitable value.
>>>>
>>>
>>> I tried setting prebuf to -1, 0, 1, 2, 4, 16, and 320. Made no
>>> difference to me.
>>>
>>> Another thing to check is if there are a couple of silent samples at the
>>>> beginning of the problematic wav files
>>>>
>>>
>>> I checked. The first 20ms are silent samples.
>>> Attached is the file.
>>>
>>> On Sun, Aug 29, 2021 at 12:06 AM Sean Greenslade <
>>> sean at seangreenslade.com> wrote:
>>>
>>>> On Fri, Aug 27, 2021 at 04:57:07PM +0200, mindfsck wrote:
>>>> > 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!
>>>>
>>>> I would not bother with trying to change sample rates, that's very
>>>> unlikely to be the issue. Plus, a lot of sound cards only support 44.1
>>>> kHz and 48 kHz, so pulse would just have to resample it again on
>>>> playback.
>>>>
>>>> One thing you could try is making use of the buffering attributes in
>>>> pa_simple_new. Specifically, setting prebuf to a suitable value. There's
>>>> some helpful info in the buffer_attr docs page here:
>>>>
>>>>
>>>> https://www.freedesktop.org/software/pulseaudio/doxygen/structpa__buffer__attr.html
>>>>
>>>> Another thing to check is if there are a couple of silent samples at the
>>>> beginning of the problematic wav files. If the first sample is non-zero,
>>>> that could potentially cause pops on playback.
>>>>
>>>> --Sean
>>>>
>>>>
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