Seems this feature is not working at all for me... I split the audio in shotcut, deleted the track.. disabled audio and exported the video as MOV in PAL 720x..
I was hoping you could at least get the original sound track to jibe with a preview quality render of the footage and then when it's all done you just add your track to the original quality and export.... but NOOOOOooo... ?
The thumbnails generate and frame thumbs show but the video preview window does nothing.. and the Animate is ticked when I right click the output window...