id3_tag_render(v2_tag, v2_buffer);
PARA_INFO_LOG("writing v2 tag (%lu bytes)\n", new_v2size);
ret = write_all(fd, (char *)v2_buffer, new_v2size);
id3_tag_render(v2_tag, v2_buffer);
PARA_INFO_LOG("writing v2 tag (%lu bytes)\n", new_v2size);
ret = write_all(fd, (char *)v2_buffer, new_v2size);