/* Send seek event to change rate */
static void gst_set_rate (JNIEnv* env,jobject thiz, jdouble rate) {
    gint64 position;
    GstEvent *seek_event;

	CustomData *data = GET_CUSTOM_DATA (env, thiz, custom_data_field_id);
	if (!data)
		return ;

    /* Obtain the current position, needed for the seek event */
    if (!gst_element_query_position (data->pipeline, GST_FORMAT_TIME, &position)) {
        LOG_ERROR("Unable to retrieve current position.\n");
        return;
    }

    gint desired_position=position/GST_MSECOND;
    LOG_INFO("send_seek_event position:%d\n",desired_position);

    /* Create the seek event */
    if (rate> 0) {
        seek_event = gst_event_new_seek (rate, GST_FORMAT_TIME, GST_SEEK_FLAG_FLUSH | GST_SEEK_FLAG_ACCURATE,
                                         GST_SEEK_TYPE_SET, position, GST_SEEK_TYPE_SET, -1);
    } else {
        seek_event = gst_event_new_seek (rate, GST_FORMAT_TIME, GST_SEEK_FLAG_FLUSH | GST_SEEK_FLAG_ACCURATE,
        		GST_SEEK_TYPE_SET, 0, GST_SEEK_TYPE_SET, position);
    }

    if (data->video_sink == NULL) {
        g_object_get (data->pipeline, "video-sink", &data->video_sink, NULL);
    }

    /* Send the event */
    gst_element_send_event (data->video_sink, seek_event);

    LOG_INFO("send_seek_event rate:%f\n",rate);
}

gstreamer.com is unrelated to the GStreamer project and provides completely outdated versions of GStreamer. Does this problem still persist with 1.6.3 from https://gstreamer.freedesktop.org/data/pkg/ios/1.6.3/ ?

You can find their tutorials ported to 1.x here https://cgit.freedesktop.org/~slomo/gst-sdk-tutorials/


What kind of media file is this and are you playing it from a local file or HTTP or which protocol?

Dear Sebastian:

  Thank you for your reply.
  This problem still persist with 1.7.2.
  And the media file is from a local file.
  And  this problem still persist when I use tutorials ported to 1.x  from https://cgit.freedesktop.org/~slomo/gst-sdk-tutorials/.

What kind of media files? Container format and codecs.

Does it also happen with GStreamer on another platform? Can you provide a debug log?

Dear Sebastian: 
   Mp3 and Mkv hava the same problem.

   mkv: container: Matroska
        audio: Vorbis
        video: RealVideo 4.0

   It happens with GStreamer on android and ios.

   There is no error.  I  will give you the debug log tomorrow(not in company  now).

  Thanks again!!

Then it should also be reproducible on Linux/Windows/OSX. If you can make a small commandline testcase for this and provide a sample file that would be great. You can base that sample on https://github.com/sdroege/gst-snippets/blob/master/app.c

Hi Sebastian: 

  I test the demo(https://cgit.freedesktop.org/~slomo/gst-sdk-tutorials/tree/gst-sdk/tutorials/basic-tutorial-13.c) on ubuntu , it do not happen when I set rate between 0 and 1. It may be happen only on android and ios ?

 I only add the code to the demo (https://cgit.freedesktop.org/~slomo/gst-sdk-tutorials/tree/gst-sdk/tutorials/android-tutorial-5).

/* Send seek event to change rate */
static void gst_set_rate (JNIEnv* env,jobject thiz, jdouble rate) {
    gint64 position;
    GstEvent *seek_event;

	CustomData *data = GET_CUSTOM_DATA (env, thiz, custom_data_field_id);
	if (!data)
		return ;

    /* Obtain the current position, needed for the seek event */
    if (!gst_element_query_position (data->pipeline, GST_FORMAT_TIME, &position)) {
        LOG_ERROR("Unable to retrieve current position.\n");
        return;
    }

    gint desired_position=position/GST_MSECOND;
    LOG_INFO("send_seek_event position:%d\n",desired_position);

    /* Create the seek event */
    if (rate> 0) {
        seek_event = gst_event_new_seek (rate, GST_FORMAT_TIME, GST_SEEK_FLAG_FLUSH | GST_SEEK_FLAG_ACCURATE,
                                         GST_SEEK_TYPE_SET, position, GST_SEEK_TYPE_SET, -1);
    } else {
        seek_event = gst_event_new_seek (rate, GST_FORMAT_TIME, GST_SEEK_FLAG_FLUSH | GST_SEEK_FLAG_ACCURATE,
        		GST_SEEK_TYPE_SET, 0, GST_SEEK_TYPE_SET, position);
    }

    if (data->video_sink == NULL) {
        g_object_get (data->pipeline, "video-sink", &data->video_sink, NULL);
    }

    /* Send the event */
    gst_element_send_event (data->video_sink, seek_event);

    LOG_INFO("send_seek_event rate:%f\n",rate);
}

The behaviour should be exactly the same on Linux as on Android/iOS here. Can you provide a log?

Closing this bug report as no further information has been provided. Please feel free to reopen this bug report if you can provide the information that was asked for in a previous comment.
Thanks!