我尝试在macosx（Mojave）上安装mpeg4ip，但失败：
sudo port install mpeg4ip
错误消息：
---> Building db48
Error: Failed to build db48: command execution failed
Error: See /opt/local/var/macports/logs/_opt_local_var_macports_sources_distfiles.macports.org_ports_databases_db48/db48/main.log for details.
Error: Follow https://guide.macports.org/#project.tickets to report a bug.
Error: Processing of port mpeg4ip failed
此项目（mpeg4ip）是否仍处于活动状态？如果没有，怎么安装！