The parser stores the text from each inline element of a scene in its own GstMemory, which is inserted in the GstBuffer containing the scene data. However, GstBuffers can contain only a limited number of GstMemorys. Therefore, don't add more than the maximum number of GstMemorys to each buffer, and warn if this is attempted. https://bugzilla.gnome.org/show_bug.cgi?id=781725