Hi @roxane - I'm sorry to hear you're having issues with the exported video. What browser are you using? (Please paste the link here: https://whatsmybrowser.org )

As it says in the app "Video rendering is an experimental feature that may not be supported on all platforms". Every browser encodes videos differently at this point, Safari has several bugs that dramatically reduce the encoded videos quality. Chrome and Edge are better. With that said, Color.io is a photo grading app and a 3D LUT builder. The video playback feature only exists to preview the 3D LUTs you're developing on a moving image instead of a still frame.

Likely Safari Bug:

@roxane - since I haven't heard back from you I've done some extensive testing. The only browser that seems to corrupt the video files during encoding is Safari on macOS. Since this is a bug in webkit (the engine behind Safari) I have no control over this.

Use Chrome Browser instead:

Until Apple addresses this bug in their browser, my suggestion would be to use Google Chrome.