this method it’s just for test i am not responsable of an illegal use.
wel well well i just remember when i had my flash video just downloaded on fuckin /tmp folder and it was so easy to …. now ? there is no fuckin easy way to do that anymore if you search on the chrome’s cache folder it’s a mess the most of time and so .,…or you just use firefox with some tricks or there is no hope until today when i just got this method  that i will save here for my own usage .
i will add just this if you want save it just do  wget LINK  🙂
#How to download streaming video
Streaming just means a download that they don't want you to keep. But Chrome's developer tools make it easy to access what's really going on under the hood.
##Open Developer Tools
From the page where you want to download some things, go into your chrome menu to open the developer tools. You can either:
1. (On a mac): Command-option-J
2. (On a PC): Control-alt-J
3. (In your menu on a mac): Open View > Developer > Developer Tools
4. (On any Chrome machine): The far right menu button, to the right of the URL bar, you can press that, go down to "Tools", then open the "Developer Tools".
##Monitor Network Traffic
By clicking the "Network" tab, you'll get a list of all files requested since you opened that tab. Our goal is to isolate the web request that returns the video of your choice. At this point, you can navigate to the video you want, and I'd probably press the "clear" button in the developer tools right before finally pressing the "Play" button on the video, so it can be one of the only transfers you see.
##Identify the video transfer
It should be easy to recognize the video transfer: It has a mime type of video, it's a transfer that should take a lot longer than the rest, etc.
Once you've found it, click on the request name, which represents the HTTP request that was sent to the server for the video file.
##Identify the Request URL
The first thing in the first tab of the request viewer should be the Request URL in the Headers tab. You can just copy this URL into another video, and now if you right click the video, it should include a Save option, unlike when the whole thing was wrapped in Flash or whatever.
##Enjoy!