Instant transcoding means that the client doesn’t have to wait for the video to finish processing before they can start streaming it. It takes very little time (approx ⅓ of the video duration).
So after we introduced this feature, As the video is being processed and is in the pre-processing condition, our customers can now acquire a functioning HLS URL without having to wait for the video to be processed. After the video has been processed, the cache will be cleared and the file will be made available in a variety of resolutions.
Please visit this link for more information.