I have a video recorded via camtasia in fullscreen

I can edit it fine in virtualdub however when i save i get the original video. If i crop 10 seconds in and 10sec before it ends the video is saved correctly if i crop 3seconds in to the time i want to edit it i get the original video... what the hell!?

How do i save this?

PS: codec is tscc and i use direct stream copy. The original is 51seconds the edit i tried to make is 45sec

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