When scheduling a live broadcast on Facebook, YouTube, or LinkedIn, a preview image can be provided. On Facebook and Linked In, this will be used for the Live Event image. On YouTube, this will be displayed as a video thumbnail on the watch page.
Image Size and Shape
When creating an image, use a 16x9 shape. For example:
1280 pixels wide by 720 pixels high
1920 pixels wide by 1080 pixels high
3840 pixels wide by 2160 pixels high (this is the recommended size for YouTube thumbnails)
Other shapes will be cropped to fit.