AW: Regarding preevent

[Thornton, Keith]

I did something similar with a queue and a valve. In c it looked like this

        m_delayQueue = gst_element_factory_make("queue", "DelayQueue");
        gst_object_ref(GST_OBJECT(m_delayQueue));
       g_object_set(G_OBJECT(m_delayQueue), "min-threshold-buffers", 30, (char *)NULL);
        g_object_set(G_OBJECT(m_delayQueue), "min-threshold-bytes", 0, (char *)NULL);
        g_object_set(G_OBJECT(m_delayQueue), "min-threshold-time", (gint64)0, (char *)NULL);
        g_object_set(G_OBJECT(m_delayQueue), "max-size-buffers", 31, (char *)NULL);
        g_object_set(G_OBJECT(m_delayQueue), "max-size-bytes", 0, (char *)NULL);
        g_object_set(G_OBJECT(m_delayQueue), "max-size-time", (gint64)0, (char *)NULL);

        m_delayValve = gst_element_factory_make("valve", "DelayValve");
        gst_object_ref(GST_OBJECT(m_delayValve));
        g_object_set(G_OBJECT(m_delayValve), "drop", TRUE, (char *)NULL);

initially I stored 30 seconds of video (30 GOPS) and then started to drop the oldest.
I then switched it into athe file by re-configuring the following

    g_object_set(G_OBJECT(m_delayValve), "drop", FALSE, (char *)NULL);
    g_object_set(G_OBJECT(m_delayQueue), "min-threshold-buffers", 0, (char *)NULL);

-----Ursprüngliche Nachricht-----
Von: gstreamer-devel [mailto:gstreamer-devel-bounces at lists.freedesktop.org] Im Auftrag von Shilpa Chandrappa
Gesendet: Montag, 17. März 2014 12:34
An: gstreamer-devel at lists.freedesktop.org
Betreff: Regarding preevent

Hi,

Is it possible to implement circluar buffer in gstreamer to store 60 seconds video data continuously. During an event trigger I need to prepend the circular buffer data with the incoming video data and store in a file.

I saw a thread which mentions using 'queue' we can achieve this. So I tried below approach.

 gst_parse_launch ("rtspsrc location=rtsp://172.22.75.2/live.sdp name=rtsp !
*queue min-threshold-time=60000000000 name=que12 ! valve drop=true
name=val12* !  rtph264depay ! video/x-h264, width=1920, height=1080,
framerate=30/1  ! avimux name=avi !  filesink location=*rtsp.avi*", &error);

 During an event trigger I am setting the below properties.

g_object_set (G_OBJECT (val2), "drop",false, NULL); g_object_set (G_OBJECT (que2), "min-threshold-time",(gint64)0, NULL);

With this approach I am *not able* to see creation of preevent video of
60seconds(prepended) in the recorded file rtsp.avi.

Is there anything which I am missing ?

I request you to provide inputs on how to achieve this.

Regards,
Shilpa







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