User Portlet User Portlet

Discussions
The week1 recap recording doesn't seem to be working for replay, https://msp4.bigmarker.com/links/wud3D6N60up/RE0CC9pK4/Ef7uvgDURRH/hKXtFDrYfl?redirect_to=https%3A%2F%2Fwww.bigmarker.com%2Fwolfram-u%2Fdsg-mpds-week-1-recap%3Fbmid%3Dea77011a35dd I...
I have a similar problem starting with first question. I used a shorthand notation of Part without "Part" that produced the requested elements from the question, but was marked wrong by auto-grader. I'll keep working on the exercises.
Thank you kindly (Vielen Dank). I won't try to reinvent the wheel.
I have a 99 minute and 43second .MOV video in ProRes422 720p format which I imported into MathematicaImport["E:\\3180\\3180HDV720p.mov"] The output I got was the following array with 358651 elements.[mcode]Out[] = {1,2,3, …...