Quick Time Player question about missing files/can't open

Hi there,

I'm having troubles with opening this particular file from Quick time player as shown in the picutre, does anyone know if it's corrupted?(Right clicked on Quick time player -> show all windows) There is no thumbnail present like in other video files, if I try to open it nothing happens and the file can't be found on my mac. This happened after I tried to trim the file a bit.