Playing a video in the engine that is WebM format, results in skipped frames and cropped resolution. This does not happen with other video formats supported in the engine. Attached are links to the WebM videos used to test.
Result: The video is cropped and skipping frames
Expected: The file to playback with the imported resolution and to play at a consistent frame rate.
There's no existing public thread on this issue, so head over to AnswerHub just mention UE-82252 in the post.