Automatic Screencapping with VLC Player for Mac
Step 1: Open VLC Player, and on the top bar go to VLC->Preferences. (x)
Step 2: On the screen that pops up, click the "Video" tab. (x)
Step 3: Click on "Show All" in the bottom left corner. (x)
Step 4: In the left-hand column, click on "Video," then "Output Modules," then "Scene Filter." (x)
Step 5: Edit the "Directory path prefix" based on where you want the caps to be saved (if you leave it blank, the caps will be saved to your "Pictures" folder). It should be in the format /Users/Username/Desktop/FolderName. For example, let's say your name is Lalala and you want your caps to be saved in a folder entitled "VlcCaps" on your desktop. The directory path prefix would read /Users/Lalala/Desktop/Vlccaps. Hint: if you don't know what your name is, open up Finder and look in the left-hand column under "Places." Your username should be the one listed under "Desktop." (x)
Step 6: Now edit the "Recording ratio," which determines how often VLC makes a screencap. The lower the number, the greater the frequency of the caps. I personally usually set it somewhere around 20, but experiment to see what you like. (x)
Step 7: Back in the left-hand column, click on "Filters" under the "Video" section. Next to where it says "Video filter module," type in "scene." Then click "Save" at the bottom of the page. (x)
You're now ready to screencap! Open up the file that you'd like VLC to cap, and it should start saving the caps right away.
Extra: To turn off automatic capping, go back to the "Filters" tab and delete the "scene" that you typed in. Then save the settings.
I hope this is helpful! If you have any questions, ask below. This tutorial is also posted on my tumblr.