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  // get info about the stream  GList* streaminfo;  g_object_get(G_OBJECT(playbin), "stream-info", &streaminfo, NULL);                   for( ; streaminfo != NULL; streaminfo = streaminfo->next) {    GObject* info = (GObject*) streaminfo->data;                                      typedef enum {      GST_STREAM_TYPE_UNKNOWN = 0,      GST_STREAM_TYPE_AUDIO   = 1,      GST_STREAM_TYPE_VIDEO   = 2,      GST_STREAM_TYPE_TEXT    = 3,    } GstStreamType;                     int type;    g_object_get(info, "type", &type, NULL);                     switch(type) {      case GST_STREAM_TYPE_AUDIO: {        break;      }      // video      case GST_STREAM_TYPE_VIDEO: {        break;      }    }    char* decoder;    char* codec;    g_object_get(info, "decoder", &decoder, "codec", &codec, NULL);    if(decoder == NULL && codec == NULL) {       std::cout << "error while getting stream-info" << std::endl;       return 1;    }    std::cout << "decoder: " << decoder << std::endl;    std::cout << "codec: " << codec << std::endl;  }  g_list_free(streaminfo);