Solution 1: Make sure browser is up to date
https://support.google.com/chrome/answer/95414?hl=en&co=GENIE.Platform%3DDesktop
Solution 2: Clear Chrome cache data
The cache refers to data stored on a device by different websites. This data that is stored locally on your system helps a website to load data from the site faster the next time you visit it. Sometimes this cached data gets mismatched and this can cause problems like the one you are facing of the video not playing. This is when you'll need to clear all the data like cookies, files, and cached images.
To clear cache data in Chrome, you need to press Ctrl + Shift + Delete in a new tab. This will open the Clear browsing data box. Select 'All time' from the Time range drop-down menu. Select Clear data.
Solution 3: Switch off hardware acceleration
When hardware acceleration is enabled on Chrome in a computer, it leads to a more efficient function of the software. However, sometimes in the process the resources that are used end up causing compatibility issues. This leads to a 'video not playing in Chrome' error.
Here is what you need to do to turn off hardware acceleration.
1. Open Google Chrome
2. Click the triple dots menu on the right topmost corner
3. Select Settings
4. Select Advanced
5. Find Hardware Acceleration under system subsection
6. Move the button towards 'off' next to 'Use hardware acceleration when available
7. Restart Google Chrome&play your video
In some systems, turning off hardware acceleration might lead to an increase in system resources but that is normal and to be expected. Don't worry about it until and unless it is really affecting your system speed and making it noticeably slow.
Solution 4: Vimeo Troubleshooting