missing attack of sound with playbin after seek to beginning

Matthieu Imbert matthieu.imbert at gmail.com
Sun Feb 26 07:31:00 UTC 2023

After further testing, i filled bug #987 to gst-plugins-base

On Mon, Feb 20, 2023 at 10:57 AM Matthieu Imbert <matthieu.imbert at gmail.com>

> I have some minimal test case to reproduce the issue here:
> https://github.com/mimbert/gst-playbin-seek-test
> You just need to clone, instantiate the two vagrant VMs (one is debian
> stable with pulse, the other is debian testing with pipewire) and run the
> test case, which plays repeatedly a bass drum sound, waiting two seconds
> between end of play and seeking back to beginning and replay.
> The behavior is even worse with this test case than with my full
> application:
> - with debian stable / pulse is works well
> - with debian testing / pipewire I can only hear the first play, and
> there's no sound after that
> I would like to know if it may be related to me not using the gstreamer
> API properly (i'm new to gstreamer), an issue at OS/driver level (e.g.
> pipewire not stable enough yet), a bug in gstreamer?
> cheers
> Matthieu
> On Sat, Feb 18, 2023 at 9:53 AM Matthieu Imbert <matthieu.imbert at gmail.com>
> wrote:
>> Hi,
>> I'm developing a software that plays sound using gstreamer playbin (in
>> python, with qt).
>> When playing sounds that have a fast attack (such as bass drum samples, i
>> can provide examples if needed), i have issues in some situations:
>>    - on my development laptop in debian testing (debian 12), with
>>    gstreamer 1.22, pipewire, when I load the sound and play it the first time,
>>    i get the correct attack, but then when seeking to 0 and playing again, the
>>    attack of the sound is "eaten", which in some cases can deeply alter the
>>    audio rendering (on a bass drum sound with a short attack, the attack is
>>    really missing, it sounds really different)
>>    - on the same laptop, in a virtualbox VM in debian stable (debian
>>    11), with gstreamer 1.18, pulseaudio, the issue does not occur
>> I tried many things to solve that, like playing with seek flags, even
>> trying introducing small delays between operations, and at this point i'm
>> really lacking ideas, so any help, suggestions would be appreciated.
>> cheers,
>> Matthieu
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