DIVE plays MP4/H.264 videos and YouTube video streams.
Here's what is working well for our customers so far:
Always test a few short samples first to narrow in on what works best for your target screens (not just your own computer screen) before proceeding to record or transcode lots of video.
Playback quality also depends a great deal on the hardware and browser you're using. DIVE-owned media computers use recent versions of Google Chrome. If you're running DIVE on your own computers you may use any supported web browser.