AAC is a audio format: it uses psychoacoustic lossy compression similar to MP3 but with improved efficiency, delivering better quality at the same bitrate. VOB is a video format that stores data in the VOB format. This wraps the audio track in a video container, which some platforms require for upload. Metadata such as creation date and embedded colour profiles is preserved where the target format supports it. Converting between these two formats is common when the source application does not support VOB natively or when the target platform only accepts VOB. 1converter processes this conversion server-side using open-source tools. Files are transferred over HTTPS, converted on secure cloud servers, and automatically deleted after 24 hours.