You are correct; Chrome fills its cache with extensionless, numbered files (most browsers do something like this as well). That is partly by design because you are not normally meant to access cache files manually (technically you are supposed to view/save files via the browser). You can identify the filetype of unknown files with tools like TrID.
That said, you are looking in the wrong place. Streaming videos are not stored in the cache; they are stored in the temporary directory.
Moreover, Internet videos are almost always set to be deleted when finished with. That is, the browser (or the Flash/Silverlight/etc. video-players to be specific) create the temporary file with a flag set that tells the OS to lock the file while it’s being used and immediately delete it when it’s released. As such, unlike other temp files, you cannot just copy it (because it’s locked) and when it’s unlocked, it’s gone.
(You don’t want the
.swf files, those are for the video-player, not the video itself which is usually either
You will need to use some tricks to get the video file:
- Download and install Unlocker
- Open the web page and let the video buffer (you will want to do this for one video at a time to keep things from getting cluttered)
- Open the folder
%tmp% (defaults to
%LOCALAPPDATA%\Temp in Windows 7, and
%USERPROFILE%\Local Settings\Temp in XP)
- look for a large file with a filename of the form
- Right-click the file and select
- Click the drop-down in the bottom-right corner and select Copy
- Save the file to another location (it needs to be on the same drive letter for now)
- Rename the file if needed (give it either a
- Open the video in a video player (VLC) and check it
- If good, then you can close the webpage and the temp file should be automatically deleted
That is the manual method and it is a bit of work (though it becomes quite fast and easy after you do it a couple of times). An easier way is to use a Chrome extension specifically meant to facilitate downloading videos instead of streaming them. Many of them support multiple video sites. For YouTube in particular, I recommend the userscript YousableTubeFix which seamlessly integrates into YouTube and also lets you remove various parts of the page (like useless comments and time-killing related-videos), as well as configure other settings like the default video size and to not auto buffer/play the video.