There are a number of different statuses related to video rendering. You may use the filter provided in Playground for easier sorting of videos based on their status.
The video has been created but not yet sent for rendering.
The video has been sent for rendering and is waiting in the queue.
The video has started rendering. The bar indicates progress to completion.
The video has been successfully rendered.
The video failed to be rendered. Please review the log file provided for more information.
The video has been successfully rendered but has been removed from the video set. It is still available to download.
Read more here.