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Pipeline preroll problem

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Duchassin Frederic

Pipeline preroll problem

Hello,

This is a code snippets of my application :

// Firstly, i link my scanning branch :

      /* CreateGstreamer element */
       m_pQueueTsParse = gst_element_factory_make("queue", "queueTsParse");
       g_object_set(G_OBJECT(m_pQueueTsParse), "max-size-buffers",
(guint)0, NULL);
       g_object_set(G_OBJECT(m_pQueueTsParse), "max-size-bytes",
(guint)0, NULL);
       g_object_set(G_OBJECT(m_pQueueTsParse), "max-size-time",
(guint64)0, NULL);

       m_pTsparse = gst_element_factory_make("tsparse", "tsparse");
       m_pFakesink = gst_element_factory_make("fakesink", "fakesink");
       g_object_set(G_OBJECT(m_pFakesink), "async", false, NULL);

       /*add gstelement to pipeline bin*/
       gst_bin_add_many(GST_BIN(m_pPipeline), m_pQueueTsParse,
m_pTsparse, m_pFakesink, NULL);

       /*link element*/
       gst_element_link_many(m_pTee, m_pQueueTsParse, m_pTsparse,
m_pFakesink, NULL);

// Secondly, i link my playing branch :

       m_pDecodebin = gst_element_factory_make("decodebin", "decodebin1");
       g_object_set(G_OBJECT(m_pDecodebin), "max-size-buffers", (guint)
0, NULL);
       g_object_set(G_OBJECT(m_pDecodebin), "max-size-bytes", (guint)
100000000, NULL);
       g_object_set(G_OBJECT(m_pDecodebin), "max-size-time", (guint64)
0, NULL);

       m_pVideoqueue = gst_element_factory_make("queue", "queueVideo");
       m_pVideosink = gst_element_factory_make("kmssink", "kmssink1");
       g_object_set(G_OBJECT(m_pVideosink), "max-lateness", (gint64)
200000000, NULL);
       //m_pVideosink = gst_element_factory_make("waylandsink",
"waylandsink1");

       m_pAudioqueue = gst_element_factory_make("queue", "queueAudio");
       g_object_set(G_OBJECT(m_pAudioqueue), "max-size-time", (guint64)
10000000000, NULL);
       g_object_set(G_OBJECT(m_pAudioqueue), "max-size-buffers",
(guint64) 2000, NULL);

       m_pAudioConvert = gst_element_factory_make("audioconvert",
"audioconvert1");
       m_pAudiosink = gst_element_factory_make("alsasink", "alsasink1");

       //CB for dynamic link
       g_signal_connect (m_pDecodebin, "autoplug-select", G_CALLBACK
(cb_autoplug_select_decodebin), this);
       g_signal_connect (m_pDecodebin, "pad-added", G_CALLBACK
(cb_new_pad_decodebin), this);
       g_signal_connect (m_pDecodebin, "element-added", G_CALLBACK
(cb_element_added_decodebin), this);
       g_signal_connect (m_pDecodebin, "autoplug-continue", G_CALLBACK
(cb_autoplug_continue_decodebin), this);

       /*add gstelement to pipeline bin*/
       gst_bin_add_many(GST_BIN(m_pPipeline), m_pDecodebin,
m_pVideoqueue, m_pVideosink, m_pAudioqueue, m_pAudioConvert,
m_pAudiosink, NULL);

       /*link element*/
       gst_element_link_many(m_pTee, m_pDecodebin, NULL);
       gst_element_link_many(m_pVideoqueue, m_pVideosink, NULL);
       gst_element_link_many(m_pAudioqueue, m_pAudioConvert,
m_pAudiosink, NULL);

// And finally, i play the pipeline :

      gst_element_set_state(m_pPipeline, GST_STATE_PLAYING);

--> as a result, my pipeline is blocked in prerolling state.....and i
don't really understand why.

But If i link my scan branch after the playing branch, it magically works !

Is somebody could explain me why ?

BR

Frédéric

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David Ing

Re: Pipeline preroll problem

I don't have an answer for you (I am not an expert) but I would suggest using the function gst_debug_bin_to_dot_data(m_pPipeline, GST_DEBUG_GRAPH_SHOW_ALL) to save a dot file of the pipeline graph at the point where it gets stuck. You can use graphviz to convert the file to an SVG which will allow you to look at the graph.

You might consider comparing the two graphs.

After your problematic pipeline gets stuck (this probably happens during the attempted transition READY --> PAUSED).
After your working pipeline successfully transitions to PAUSED.

You will probably notice a difference in the graphs. Either there will be a missing link in the first graph, or you will see that caps didn't get negotiated properly ... or something like that. It should provide a hint about what is wrong.

On Tue, Apr 16, 2019 at 2:57 AM Duchassin Frederic <[hidden email]> wrote:

Hello,

This is a code snippets of my application :

// Firstly, i link my scanning branch :

      /* CreateGstreamer element */
       m_pQueueTsParse = gst_element_factory_make("queue", "queueTsParse");
       g_object_set(G_OBJECT(m_pQueueTsParse), "max-size-buffers",
(guint)0, NULL);
       g_object_set(G_OBJECT(m_pQueueTsParse), "max-size-bytes",
(guint)0, NULL);
       g_object_set(G_OBJECT(m_pQueueTsParse), "max-size-time",
(guint64)0, NULL);

       m_pTsparse = gst_element_factory_make("tsparse", "tsparse");
       m_pFakesink = gst_element_factory_make("fakesink", "fakesink");
       g_object_set(G_OBJECT(m_pFakesink), "async", false, NULL);

       /*add gstelement to pipeline bin*/
       gst_bin_add_many(GST_BIN(m_pPipeline), m_pQueueTsParse,
m_pTsparse, m_pFakesink, NULL);

       /*link element*/
       gst_element_link_many(m_pTee, m_pQueueTsParse, m_pTsparse,
m_pFakesink, NULL);

// Secondly, i link my playing branch :

       m_pDecodebin = gst_element_factory_make("decodebin", "decodebin1");
       g_object_set(G_OBJECT(m_pDecodebin), "max-size-buffers", (guint)
0, NULL);
       g_object_set(G_OBJECT(m_pDecodebin), "max-size-bytes", (guint)
100000000, NULL);
       g_object_set(G_OBJECT(m_pDecodebin), "max-size-time", (guint64)
0, NULL);

       m_pVideoqueue = gst_element_factory_make("queue", "queueVideo");
       m_pVideosink = gst_element_factory_make("kmssink", "kmssink1");
       g_object_set(G_OBJECT(m_pVideosink), "max-lateness", (gint64)
200000000, NULL);
       //m_pVideosink = gst_element_factory_make("waylandsink",
"waylandsink1");

       m_pAudioqueue = gst_element_factory_make("queue", "queueAudio");
       g_object_set(G_OBJECT(m_pAudioqueue), "max-size-time", (guint64)
10000000000, NULL);
       g_object_set(G_OBJECT(m_pAudioqueue), "max-size-buffers",
(guint64) 2000, NULL);

       m_pAudioConvert = gst_element_factory_make("audioconvert",
"audioconvert1");
       m_pAudiosink = gst_element_factory_make("alsasink", "alsasink1");

       //CB for dynamic link
       g_signal_connect (m_pDecodebin, "autoplug-select", G_CALLBACK
(cb_autoplug_select_decodebin), this);
       g_signal_connect (m_pDecodebin, "pad-added", G_CALLBACK
(cb_new_pad_decodebin), this);
       g_signal_connect (m_pDecodebin, "element-added", G_CALLBACK
(cb_element_added_decodebin), this);
       g_signal_connect (m_pDecodebin, "autoplug-continue", G_CALLBACK
(cb_autoplug_continue_decodebin), this);

       /*add gstelement to pipeline bin*/
       gst_bin_add_many(GST_BIN(m_pPipeline), m_pDecodebin,
m_pVideoqueue, m_pVideosink, m_pAudioqueue, m_pAudioConvert,
m_pAudiosink, NULL);

       /*link element*/
       gst_element_link_many(m_pTee, m_pDecodebin, NULL);
       gst_element_link_many(m_pVideoqueue, m_pVideosink, NULL);
       gst_element_link_many(m_pAudioqueue, m_pAudioConvert,
m_pAudiosink, NULL);

// And finally, i play the pipeline :

      gst_element_set_state(m_pPipeline, GST_STATE_PLAYING);

--> as a result, my pipeline is blocked in prerolling state.....and i
don't really understand why.

But If i link my scan branch after the playing branch, it magically works !

Is somebody could explain me why ?

BR

Frédéric

_______________________________________________
gstreamer-devel mailing list
[hidden email]
https://lists.freedesktop.org/mailman/listinfo/gstreamer-devel

_______________________________________________
gstreamer-devel mailing list
[hidden email]
https://lists.freedesktop.org/mailman/listinfo/gstreamer-devel

Duchassin Frederic

Pipeline preroll problem

In reply to this post by Duchassin Frederic