OOONA's Toolkit supports the formats which can be played by Google Chrome browser natively.
This means you can use:
.MP4 or .MOV with h.264 video codec (AVC)
.WEBM with stereo or mono audio.
We recommend working with MP4 files (h.264 video codec) due to their cross-platform compatibility.
Some video converters default to older h.263 codec when creating .MP4 files - in this case the video will not be displayed. The solution will be to re-encode the video with h.264 codec.
You can drag a video to a new browser tab and make sure it's playable in the browser.
For adaptive streaming over HTTP, OOONA Tools player supports HLS and MPEG-DASH.