Appsrc doesn't play audio to autoaudiosink

[Kyle Gibbons]

I am finally making some progress! I set the min-latency to 8000000000
which obviously causes a huge delay, but does allow audio to play. When I
stop sending audio I get a "Got Underflow" error from pulsesink and then
audio does not play again until I restart the application. Also, the audio
does not sound great. It's almost like it's playing under speed, sounds a
bit lower than expected. I have to set the volume to at least 2 to be able
to hear the audio well.

Is there a way to compensate for the timestamps coming in from the source
without introducing a large delay? I am guessing that since I am basically
just passing the opus from Zello through my application that the
origins opus timestamp is being used, which of course would be well past
when my app starts playing.

All the best,
Kyle Gibbons



On Wed, Nov 24, 2021 at 8:02 AM Kyle Gibbons <kyle at kylegibbons.com> wrote:

> I wanted to add that when there is data coming in the samples and buffers
> should be consistent, but because the ultimate source is a walkie-talkie
> like interface, there is not always audio coming in. We only send data to
> gstreamer when there is audio coming into the system over the network, we
> do not send silence. I did try starting the stream before the application
> so there was essentially always audio flowing in, but that made no
> difference.
>
> All the best,
> Kyle Gibbons
>
>
>
> On Wed, Nov 24, 2021 at 7:00 AM Kyle Gibbons <kyle at kylegibbons.com> wrote:
>
>> Tim,
>>
>> Thanks for the reply. I tried adding min-latency of 40000000, 60000000,
>> 100000000, and 1000000000 to no avail.
>>
>> The buffers and number of samples should be consistent. The audio comes
>> from another service I wrote using Go and Pion which gets its audio from
>> the Zello API (zello.com)
>>
>> All the best,
>> Kyle Gibbons
>>
>>
>>
>> On Wed, Nov 24, 2021 at 6:48 AM Tim-Philipp Müller via gstreamer-devel <
>> gstreamer-devel at lists.freedesktop.org> wrote:
>>
>>> Hi Kyle,
>>>
>>> > But this doesn't:
>>> >
>>> > appsrc is-live=true do-timestamp=true name=src ! queue ! opusparse !
>>> > opusdec ! audioconvert ! audioresample!  queue ! pulsesink
>>>
>>>
>>> Try adding appsrc min-latency=40000000 (=40ms in nanoseconds) or such.
>>>
>>> You might have to experiment with the values.
>>>
>>> Do you always push in buffers of the same size / number of samples?
>>> Where do you get the audio data from?
>>>
>>> Cheers
>>>  Tim
>>>
>>
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