I have a savvy instructor who ran into this trouble (added a video that when played back had a green screen - audio was there but video was greenish).
None of our eLearning staff could replicate this teacher's experience on our Mac's, PC's and varied browsers. So I assumed this was specific to this teacher's computer and browser settings because these videos are working for her students and our staff on our varied setups.
Upon working with the teacher virtually today (12/30/2020) we narrowed the trouble down to her PC, her Chrome browser and her videos (whether they were youtube or self-created did't matter) placed on an assignment page is when they would turn green upon play. When placed on a regular Canvas page, she didn't get the green screen. I stripped down the video code to its bare minimum on the assignment page in case.
The same videos placed on a regular Canvas page (not an assignment page) didn't turn green for her. We tested her assignment page and regular page in Firefox and had no trouble with any of the videos we tried on both assignment pages and regular Canvas pages. Which means this troubleshooting is pointing us to something to do with her Chrome/PC's experience/settings and whatever assignment page code personal PC is complaining about.
- More work is needed on determining what Chrome, on her personal PC, is running into on videos embedded/linked on assignment pages that its balking at.
- The students and our eLearning staff are not experiencing trouble with these videos.
- The teacher is now using Firefox to view her assignment pages where she's embedded videos.