Hi Gregor, This might partially help - to get around a similar issue with clip length, we extract with IPWS the system metadata "_QM_TRACK_INFO" from which we parse out the various available tracks and durations in frames: 1,PICTURE,1810,30000/1001;1,SOUND,1810,30000/1001;2,SOUND,1810,30000/1001;3,SOUND,1810,30000/1001;4,SOUND,1810,30000/1001;