So I dug a little bit deeper into this bug and in my case it turned out the real problem is libopenblas0-pthread version 0.3.10+ds-2 and -3.
This package is a dependency of libopenblas0 which is a dependency of Octave and others. Creating a thumbnail with totem-video-thumbnailer fails for flv and mkv videos like that one mentioned by the OP: (totem-video-thumbnailer:37500): GStreamer-WARNING **: 21:23:41.129: failed to create thread: Error creating thread: Die Ressource ist zur Zeit nicht verfügbar (totem-video-thumbnailer:37500): GLib-ERROR **: 21:23:41.131: ../../../glib/gmem.c:112: failed to allocate 3145167 bytes Trace/Breakpoint ausgelöst Installing libopenblas0-pthread_0.3.10+ds-1 or adding the -l option in /usr/share/thumbnailers/totem.thumbnailer works around this bug. this bug report should really be forwarded to libopenblas0-pthread... Greetings Thorsten
