why don't you cut the clip using ReelSurfer and we can add it to the mashup?
"The owner of this video has disabled clipping. Try a different video."
Bad luck aside, ReelSurfer is a nice tool.
0.02$: Find a workaround to this: it will damage UX of your first users.
At this point if the video has its embed functionality disabled there is no way to clip it. Trying to figure out workarounds now