After using your Samsung Galaxy S5 for a few weeks now I'm pretty sure you already know how to play videos and other multimedia files. So, apparently, this post is for those who might still be learning the ins and outs of the phone especially the ones who just got their first smartphone. The new Galaxy S5 can play a handful of video formats such as: MP4, 3GP, 3G2, AVI, ASF, FLV, M4V, MKV, WEBM, and WMV. Playing videos on it is straightforward: Step 1 : From the Home screen, tap the Apps icon.