If you want to help with mythtv packaging, please start from the packaging work done for Ubuntu at
https://github.com/MythTV/packaging. The main maintainer for the mythtv packages in Ubuntu is superm1.
Note that for Debian, the issue with using a fork of ffmpeg/libav will need to be addressed. Last I checked, mythtv was still making changes to their version of ffmpeg that were different from upstream ffmpeg/libav. There's also the licensing issues from using openssl. With this, I believe you can simply use the openssl wrapper provided by gnutls.