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Yep! Just a slight thing. Specifying -t gives the duration for the clip, not the end time. For the end time you want -to instead.

That seems like it would encode the video again and youtube is already ass-quality. Start and end the cut on key frames instead to keep it...

Yep, you don't even need to download the whole file. From the FFMPEG tips and tricks thread: note: I have edited the quoted post to fix the...