I've been using Smart Cutter to cut out parts of videos I downloaded from Youtube, and with some downloaded videos, after I transcode them, the file won't play. I get the following error message:

"The document “videoplayback.[0].mp4” could not be opened. An unknown error occurred (-12842)"


I have tried downloading them at a lower resolution and using Smart Cutter on those and they work then. Any idea what could be the cause of this?