FR 12 then OS 543 at Vienna
Barcelona → Vienna → Venezia
Timetable, Vienna time
17:20FR 12 from Barcelona at the gate
12:50OS 543 to Venezia leaves the gate
19 h 30 apart on the timetable, overnight
OS 543 leaves 19 h 30 after FR 12 arrives on the timetable: more than half a day, so not a connection we count.