
To clear cookies and cache, go to your Chrome settings, and search for Cookie -> Select browsing data, cookies and other site data, cached images and files. In most of the cases, this should get your Twitter videos started. This is probably the most feasible solution to 99% browser related problems. To check, click on the lock shape icon on your address bar, and make sure flash is not blocked. If your browser’s flash is not enabled, then your videos may not work on Chrome. Click the Repair button to start repairing the video by quick recovery mode. After you are done adding the corrupted video files.

On mobile apps, Twitter supports MP4 and MOV video formats. Twitter supports MP4 video format in H264 format and A64 audio on the web.
