ii libgstreamer-plugins-base1.0-0 1.18.3-dmo1
ii gstreamer1.0-plugins-good 1.18.3-dmo1 ii libasound2-plugins 1:1.2.2-dmo1
ii gstreamer1.0-libav 1:1.18.3-dmo1 ii gstreamer1.0-plugins-bad 1:1.18.3-dmo2 ii gstreamer1.0-plugins-ugly 1:1.18.3-dmo1
The 64-bit version of libgstreamer-plugins-base1.0-0 is from deb-multimedia, make sure you install the 32-bit package from the same source.
Otherwise try replacing all deb-multimedia packages with the original Debian variant.
--- Floris