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<div class="moz-cite-prefix">Downward state changes are always
synchronous.<br>
<br>
So once gst_element_set_state (pipeline, GST_STATE_NULL);
completes, all the internal elements are in the NULL state and you
can unref the pipeline.<br>
<br>
On 8/5/19 12:42 pm, Halley Zhao wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CAJ1_6ND3poCuEN_fFmujq=pV9eDf0_a4E-FjLMDyv-42LdbL2w@mail.gmail.com">
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<div dir="ltr">then, what's the right way to cleanup the pipeline
to make sure it has already changed status to GST_STATE_NULL?</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">Matthew Waters <<a
href="mailto:ystreet00@gmail.com" moz-do-not-send="true">ystreet00@gmail.com</a>>
于2019年5月8日周三 上午10:32写道：<br>
</div>
<blockquote class="gmail_quote" style="margin:0px 0px 0px
0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
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<div class="gmail-m_-3439340797728667417moz-cite-prefix">Not
receiving READY->NULL state change messages is normal
as the GstBus attached to the pipeline is set to flushing
to avoid reference cycles.<br>
<br>
Cheers<br>
-Matt<br>
<br>
On 8/5/19 12:05 pm, Halley Zhao wrote:<br>
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<div dir="ltr">
<div dir="ltr">
<div dir="ltr">
<div dir="ltr">
<div>Hi experts:</div>
<div>I want to do cleanup after pipeline changed
to GST_STATE_NULL. however I
received GST_MESSAGE_STATE_CHANGED with
newstate of GST_STATE_NULL of its children
element, but not the pipeline itself.</div>
<div><br>
</div>
<div>I don't know whether there is something
wrong in my code, or it is by design?</div>
<div>my pipeline contains
"appsrc-->h264parse-->videodecode-->appsink".
here is my log:</div>
<div>the source code sees attachment</div>
<div><br>
</div>
<div>
<div>(cb_need_data, 148)emit eos signal</div>
<div>(bus_call, 61)End of stream</div>
<div><br>
</div>
<div>(bus_call, 84)my_sink state change, old
state: PLAYING, new state: PAUSED</div>
<div>(bus_call, 84)my_vdec state change, old
state: PLAYING, new state: PAUSED</div>
<div>(bus_call, 84)my_h264parse state change,
old state: PLAYING, new state: PAUSED</div>
<div>(bus_call, 84)my_appsrc state change, old
state: PLAYING, new state: PAUSED</div>
<div>(bus_call, 84)my_pipeline state change,
old state: PLAYING, new state: PAUSED</div>
<div>(bus_call, 84)my_sink state change, old
state: PAUSED, new state: READY</div>
<div>(bus_call, 84)my_vdec state change, old
state: PAUSED, new state: READY</div>
<div>(bus_call, 84)my_h264parse state change,
old state: PAUSED, new state: READY</div>
<div>(bus_call, 84)my_appsrc state change, old
state: PAUSED, new state: READY</div>
<div>(bus_call, 84)my_pipeline state change,
old state: PAUSED, new state: READY</div>
<div>(bus_call, 84)my_sink state change, old
state: READY, new state: NULL</div>
<div>(bus_call, 84)my_vdec state change, old
state: READY, new state: NULL</div>
</div>
</div>
</div>
</div>
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<pre class="gmail-m_-3439340797728667417moz-quote-pre">_______________________________________________
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