Question

我目前正在尝试与GSteamer循环播放视频。我目前有这样实现：

void VPlayer::playFile(QString video_filename, bool loop)
{
    m_isLooping = loop;
    QString cmdstr = "gst-launch-1.0 -v filesrc location=" + video_filename + " ! qtdemux ! queue max-size-buffers=0 max-size-time=0 ! vpudec frame-drop=0 ! queue ! imxv4l2sink device=/dev/video16";
    GError **l_error = NULL;;
    m_gst_pipeline = gst_parse_launch (cmdstr.toUtf8().data(), l_error);

    m_gst_bus = gst_pipeline_get_bus (GST_PIPELINE(m_gst_pipeline));
    gst_bus_set_sync_handler (m_gst_bus, GStreamerBusCallback, this, nullptr);
    gst_object_ref (m_gst_bus);
    gst_object_ref(m_gst_pipeline);

    gst_element_set_state (m_gst_pipeline, GST_STATE_NULL);
    gst_element_seek_simple (m_gst_pipeline, GST_FORMAT_TIME, GST_SEEK_FLAG_FLUSH, 0);
    gst_element_set_state (m_gst_pipeline, GST_STATE_PLAYING);
}

GstBusSyncReply VPlayer::GStreamerBusCallback(GstBus *bus, GstMessage *msg, gpointer data)
{
    VPlayer* player = (VPlayer*) data;
    GstElement *pipeline = player->getPipeline();
    switch (GST_MESSAGE_TYPE(msg))
    {
    case GST_MESSAGE_EOS:
        /* restart playback if at end */
        qDebug() << "PLAYBACK FINISHED";
        if(player->isLooping())
        {
            qDebug() << "LOOPING";
            gst_element_seek_simple (pipeline, GST_FORMAT_TIME, GST_SEEK_FLAG_FLUSH, 0);
            gst_element_set_state (pipeline, GST_STATE_PLAYING);
        }

        break;
    default:
        break;
    }

    return GST_BUS_PASS;
}

当我运行此示例时，我得到了预期的EOS，调试输出也可以，但是没有寻找图像冻结的情况，没有任何反应。而且循环似乎没有继续。

我在这里想念什么？

Answer 1

至少需要解决此问题：

$sql = "INSERT INTO visitors (visitor_id,visitor_name,gender,address,phone,date,contact_person,reason,photo,time_in) 
    VALUES (".$visitor_id.",'".$visitor_name."','".$gender."','".$address."',".$phone.",'".$date."','".$contact_person."','".$reason."','".$fileName."','".$time_in."')";

if ($conn->query($sql) === TRUE) {
  //echo "New record created successfully";
  echo "<script>alert('Record inserted')</script>;";
  include('visitor.php');
} else {
  echo "<script>alert('Record cannot be inserted')</script>;";
  include('visitor.php');
}

我假设您在某处致电GError *l_error = NULL; m_gst_pipeline = gst_parse_launch (cmdstr.toUtf8().data(), &l_error);。

C ++ / Qt 5 GStreamer继续循环

1 个答案: