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

[guest271314]

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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