g_string_append_printf(filename, "-%" PRId64 "-%" PRId64,
stream_class_id, stream->common.id);
file_path = g_build_filename(writer->path->str, filename->str, NULL);
g_string_append_printf(filename, "-%" PRId64 "-%" PRId64,
stream_class_id, stream->common.id);
file_path = g_build_filename(writer->path->str, filename->str, NULL);