Appsink halts pipeline

[luca101]

Hello,

I'm trying to grab frames with appsink to implement a GUI in Qt.  To test my pipeline, I first run it from the console but after the 1st frame or so it halts completely. Can you please tell me what is wrong with it:

gst-launch-1.0 imxv4l2videosrc device=/dev/video1 ! tee name=tp \tp. ! queue ! imxeglvivsink  \tp. ! queue ! appsink

Thank you!

Luca

[John OCallaghan]

Hi Luca

Looking at the appsink plugin page I see that it has a “drop” capability that defaults to FALSE. This means that the appsink will hold that first frame in its buffer until you ask for it (gst_app_sink_try_pull_sample) and will signal back up the pipeline that no other frames should be sent. You can try setting the drop cap to TRUE and this should then start to drop all those frames as they come through.

At least that’s my understanding of how it works.
Hope that helps
John


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On 23/01/2017, 20:39, "gstreamer-devel on behalf of luca101" <[hidden email] on behalf of [hidden email]> wrote:

    Hello,

    I'm trying to grab frames with appsink to implement a GUI in Qt.  To test my
    pipeline, I first run it from the console but after the 1st frame or so it
    halts completely. Can you please tell me what is wrong with it:

    *gst-launch-1.0 imxv4l2videosrc device=/dev/video1 ! tee name=tp \tp. !
    queue ! imxeglvivsink  \tp. ! queue ! appsink*

    Thank you!

    Luca



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[luca101]

Hello John,

Thanks a lot for your reply! I already tried some combinations of settings for appsink (like drop=TRUE) but it still halts after the first frame or 2.

I put the pipeline into a test program but I got the same results.

//Configure appsink
g_object_set (G_OBJECT (appsink), "emit-signals", TRUE, "drop", TRUE, "sync", FALSE, "throttle-time", 0, "max-buffers", 5, "wait-on-eos", FALSE, "eos", FALSE, "qos", TRUE, NULL);


//Connect signal "new-sample" to function new_sample()
g_signal_connect (appsink, "new-sample", G_CALLBACK(new_sample), NULL);


//Function new_sample()
static void new_sample (GstElement *appsink, gpointer user_data) {
  GstSample *sample=NULL;
  g_signal_emit_by_name (appsink, "pull-sample", &sample, NULL);
}

I'm still trying to solve this problem and appreciate any ideas.

Cheers,

-Luca