If you are not sure whether your embedded video's URL is wrong:
Edit the resource which contains your embedded video. This might be a Label, Page, Book, Lesson, Quiz, Assignment, or Forum Post (i.e., LEO resources that may include HTML content).
When you first open a page with the text editor, you will probably only see one row of editing functions until you select the first button in the Text Editor called 'Toolbar Toggle'.
Select the 'Toolbar Toggle' button to open up two more rows of editing functions.
Next to 'Font size' on the bottom row of icons is the 'Edit HTML source' button . Selecting 'Edit HTML source' will open a new pop-up window called the 'HTML source editor'. In this editor, find for your embedded video's HTML code. The following example is the HTML code for embedding the "Welcome to Australian Catholic University for Undergraduate Students" video on YouTube: <iframe src="http://www.youtube.com/embed/mdNA7wMlqNM?rel=0" allowfullscreen="" frameborder="0" height="315" width="560"></iframe>
In this example, the SRC value is http://www.youtube.com/embed/mdNA7wMlqNM?rel=0. This will not work in LEO because your web browser expects an "s" after "http". For this example to work, the SRC value must be changed to https://www.youtube.com/embed/mdNA7wMlqNM?rel=0.
Note: '?rel=0' needs to be added after the video ID. This will stop suggested videos from appearing once the primary video is finished playing.
Change the beginning of your embedded video's SRC value to "https" and click "Save changes".
Changing your embedded video's SRC value from "http" to "https" will also fix issues with HTML codes from most other video sources like SBS News Videos, Vimeo and Dailymotion.