[GST_BUFFER_TIMESTAMP] Large intervalle delta skew timestamp on rtp_jitter_buffer

[sofien rahmouni]

Hello Guys,

After the receiving video frame from jni , i try to construct the buffer to
be displayed on my android screen but i have an issue which consist freez
video after some seconds.

here is my method of push frame data on appsrc pipeline :


static void gst_native_receive_video_data(JNIEnv *env, jobject thiz,
jbyteArray array) {

    GstFlowReturn ret;

    jbyte *temp = (*env)->GetByteArrayElements(env, array, NULL);
    jsize size = (*env)->GetArrayLength(env, array);

    GST_DEBUG("Gst size before %d", size);

    GstBuffer *buffer = gst_buffer_new_allocate(NULL, size, NULL);
    gst_buffer_fill(buffer, 0, temp, size);

    GST_DEBUG("Gst size after %d", gst_buffer_get_size(buffer));

    //g_async_queue_push(gAsyncQueue, gst_buffer_ref(buffer));

    GstElement *element =
gst_bin_get_by_name(GST_BIN(pCustomData->pipeline), "video_app_source");

    if (basetimestamp == 0) {

        if (appsrc) {
            element = gst_object_ref(appsrc);
        } else {
            fprintf(stdout, "%s:%d %s\n", __func__, __LINE__, "manually
setting time: exit");
            element = NULL;
            return;
        }

        GST_OBJECT_LOCK (element);

        if (GST_ELEMENT_CLOCK (element)) {
            GstClockTime now;
            GstClockTime base_time;
            now = gst_clock_get_time (GST_ELEMENT_CLOCK (element));
            base_time = GST_ELEMENT_CAST (element)->base_time;

            basetimestamp = now - base_time;
            GST_BUFFER_TIMESTAMP (buffer) = basetimestamp;

            GST_DEBUG ("Timestamp calculated = : %",GST_TIME_ARGS
(basetimestamp));

        }

        GST_OBJECT_UNLOCK (element);
        gst_object_unref (element);

        gst_app_src_push_buffer (GST_APP_SRC(element), buffer);
    } else {
        gst_app_src_push_buffer(appsrc, buffer);
    }
    
    (*env)->ReleaseByteArrayElements(env, array, temp, JNI_ABORT);
}

in the logs i see the delta skew become a big interval on timestamp :

03-18 14:04:25.520 9749-10359/com.test.demo W/GStreamer+rtpjitterbuffer:
0:00:25.369909886 0x9b61eb80
../gst/rtpmanager/rtpjitterbuffer.c:749:rtp_jitter_buffer_calculate_pts
backward timestamps at server, schedule resync
03-18 14:04:27.585 9749-10359/com.test.demo W/GStreamer+rtpjitterbuffer:
0:00:27.436841348 0x9b61eb80
../gst/rtpmanager/rtpjitterbuffer.c:749:rtp_jitter_buffer_calculate_pts
backward timestamps at server, schedule resync
03-18 14:04:27.725 9749-10359/com.test.demo W/GStreamer+rtpjitterbuffer:
0:00:27.574713348 0x9b61eb80
../gst/rtpmanager/rtpjitterbuffer.c:749:rtp_jitter_buffer_calculate_pts
backward timestamps at server, schedule resync
03-18 14:04:27.785 9749-10359/com.test.demo W/GStreamer+rtpjitterbuffer:
0:00:27.635596155 0x9b61eb80
../gst/rtpmanager/rtpjitterbuffer.c:573:calculate_skew delta - skew:
0:00:01.004460489 too big, reset skew

Can you please give me how can i resolve this issue of the timestamp.

Best Regards,
Sofien



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