Mix of picture and video does seem to be tricky.
IrfanView worked for me.
Hardware Media Players don't seem to do it. In particular the Micca Speck, the Incredisonic, the Blusmart, and KDLINKS HD720 mini-hardware media players do NOT do it. That is, as of 6/2/2015 because they come out with new versions of these little boxes every year or so.
How do I know?I purchased the Micca Speck and tried it. A friend had the Incredisonic (which btw had the EXACT same menu system as the Micca Speck) and I tried it. For the Blusmart I asked on Amazon's question feature and someone who owned it actually tried it. And for the KDLINKS I also asked in Amazon and a distributor answered.
I also tried on a recent Android tablet the Gallery app and Picasa.Gallery you had to click on the video. Picasa didn't see the videos.
So following recommendations here I downloaded IrfanView today (thru LiberKey (a portable application launcher, although i think i prefer...