Amazon s3 and node js video streaming and thumbnail?

I am working in a node.js project in which I need to upload .mp4 files to amazon s3.

I have 2 questions:

QUES 1: I have uploaded the mp4 file into a private type bucket lets say the name of bucket is 'videobucket'. To view the video in the browser, I created it's signed URL.

My question is:

Is the signed ULR that am getting, different from the STREAMED URL. IF yes, what steps should I perform for generating the streamed URL?

QUES 2: I need to create the thumbnail of the video that I am going to upload to amazon s3. How can I do it in node.js?

I am newbie in amazon and node.

Thank you all in advance!