List of best mirrors for IP address 3.19.255.255, located in an unknown country.
I am very sorry, but no mirror was found. Feel free to download directly:
http://mirrordirector-mb.raspbian.org/raspbian/pool/main/q/qtmultimedia-opensource-src/libqt5multimediagsttools5_5.15.15-2_armhf.deb