volatile is not sufficient to provide atomic guarantees and real atomics should be used instead. GCC 11 has started warning about using volatile with atomic operations. https://gitlab.gnome.org/GNOME/glib/-/merge_requests/1719 Discovered in https://gitlab.freedesktop.org/gstreamer/gst-plugins-good/-/issues/868 Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/2098>
Add a parser (ttmlparse) and renderer (ttmlrender) element that handle subtitles that use the EBU-TT-D profile of TTML1. https://bugzilla.gnome.org/show_bug.cgi?id=758232