Enable sip test for flatpak
After merging !621 (merged) we still need to fix the sip test for flatpak.
The flatpak is missing avdec_g722
and avenc_g722
codecs, to add those we need to build gstreamer ourself (I think with -Dlibav=enabled
).
See: https://github.com/flathub/org.gnome.Totem.Devel/blob/beta/codecs/gstreamer.json