This url returns a huge html page which is for watching the video.

http://www.youtube.com/watch?v=some_id

I can't go through all the HTML tags and get the right url to the actual video. I believe there is a url from where the actual video stream is coming. I expect it to be something like,

http://www.youtube.com/get_the_video?id=some_id
Or,
http://www.youtube.com/get_the_video/some_id.mp4

I can't find any information about the correct url for the video.

Is this how YouTube maintain it's video link or their is something else?

Do they always change the url?

I want to do something like this in HTML to play the video.

<video width="320" height="240" controls autoplay>
        <source src="http://www.youtube.com/get_the_video?id=some_id" type="video/mp4">
</video>

(I am new to how YouTube works. Need some guidance)

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