appsink to appsrc issue

[Tomasz Mikolajczyk]

Hi Adam,

I would also try to set appsrc's "is-live" property to true and also
autoaudiosink's "sync" property to false.

Regards,
Tomasz

On Wed, Jul 20, 2022 at 2:50 PM Ádám Balázs via gstreamer-devel <
gstreamer-devel at lists.freedesktop.org> wrote:

> Hi,
>
> I have the following pipelines:
> gst_parse_launch(R"(udpsrc port=4000 !
> application/x-rtp,payload=96,encoding-name=OPUS ! queue ! rtpopusdepay !
> appsink name=appsink)", nullptr)}
> and
> gst_parse_launch(R"(appsrc name=appsrc caps="audio/x-opus" ! queue !
> opusdec ! autoaudiosink)", nullptr)}
>
> For the appsink in the first pipeline I set "emit-signals", true and
> connect "new-sample" to a callback that pushes the buffer into a queue.
>
> For the appsrc in the second pipeline I connect callbacks to its
> "need-data" and "enough-data" signals. Those callbacks set or reset the
> g_main_loop's idle function to a function that reads a buffer from the
> queue (filled by the appsink of the first pipeline) and pushes it to appsrc
> with "push-buffer".
>
> Unfortunately the second pipeline fails as soon as the first buffer is
> pushed to it with the following log:
> 0:00:00.045154855 57060 0x55a09f976700 INFO               GST_EVENT
> gstevent.c:900:gst_event_new_segment: creating segment event bytes segment
> start=0, offset=0, stop=-1, rate=1.000000, applied_rate=1.000000,
> flags=0x00, time=0, base=0, position 0, duration -1
> 0:00:00.045165391 57060 0x55a09f976700 INFO                 basesrc
> gstbasesrc.c:2962:gst_base_src_loop:<appsrc> marking pending DISCONT
> 0:00:00.045180104 57060 0x55a09f976700 WARN                 basesrc
> gstbasesrc.c:3072:gst_base_src_loop:<appsrc> error: Internal data stream
> error.
> 0:00:00.045183271 57060 0x55a09f976700 WARN                 basesrc
> gstbasesrc.c:3072:gst_base_src_loop:<appsrc> error: streaming stopped,
> reason not-negotiated (-4)
> 0:00:00.045196292 57060 0x55a09f976700 INFO        GST_ERROR_SYSTEM
> gstelement.c:2140:gst_element_message_full_with_details:<appsrc> posting
> message: Internal data stream error.
> 0:00:00.045212868 57060 0x55a09f976700 INFO        GST_ERROR_SYSTEM
> gstelement.c:2167:gst_element_message_full_with_details:<appsrc> posted
> error message: Internal data stream error.
> 0:00:00.045225606 57060 0x55a09f976700 INFO                    task
> gsttask.c:312:gst_task_func:<appsrc:src> Task going to paused
>
> Without the appsink -> appsrc detour (if I chain the elements into one
> pipeline) everything works. If I remove the opusdec and autoaudiosink from
> the end of the second pipeline and I replace it with another appsink it
> sees the data and the pipeline works well.
>
> Is there any trick I should do to be able to feed opusdec from an appsrc?
>
> Thanks a lot,
> Adam
>
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