Playing ALAC files and generating MP4 thumbnails no longer working in versions newer than 1.18.3
I have Arch Linux and Cinnamon with its default Nemo file manager.
Since upgrading from version 1.18.3 to the 1.18.4 series, I noticed that Gnome-videos (totem) and Rhythmbox would no longer play my ALAC files. In addition, Nemo is unable to generate thumbnails for my MP4 video files.
I have isolated this issue by downgrading all gstreamer packages until it was finally resolved by downgrading gst-libav to version 1.18.3-1 from the Arch Linux archive.
What can possibly be going on and how can I help in debugging this?