same issue here. removing gstreamer1.0-vaapi solved it for Quicktime MPEG4-AAC files produced by iPhone.
I was getting the same error: (totem:3619317): GStreamer-CRITICAL **: 22:44:02.296: gst_buffer_get_meta: assertion 'buffer != NULL' failed -- You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is subscribed to totem in Ubuntu. https://bugs.launchpad.net/bugs/1969767 Title: totem crashes when attempting to play mp4 files [gst_buffer_get_meta: assertion 'buffer != NULL' failed] To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/totem/+bug/1969767/+subscriptions -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs
