We strongly encourage you use Chromium-based browsers (e.g., Google Chrome, Brave, Edge) when using Encord. Our team conducts all development & testing using Google Chrome.
This is primarily due to optimizing performance & ensuring data integrity. Modern browsers give no control over deterministically rendering media files (e.g., displaying frames and rendering videos). Further, we also recommend turning off hardware acceleration in Chrome. Hardware acceleration adds another layer of indeterminism to video rendering in the browser. To eliminate unexpected behaviour, we strongly recommend disabling hardware acceleration.
You can read more about supported videos here, and learn more about frame synchronisation issues here.
Please reach out to firstname.lastname@example.org if you have any questions.