retranscode

Retranscode is a term that refers to the process of converting a digital media file, such as a video or audio file, from one format to another, and then immediately converting it back to the original format or a similar one. This is often done unintentionally due to specific software settings or workflows.

The primary reasons for retranscoding, even if unintentional, can be varied. For instance, some editing software might automatically re-encode files when they are imported or exported, even if no actual editing has taken place. This can happen if the software's default settings are configured to use a specific codec or bitrate, and it applies this to all media it processes. Additionally, some media players or streaming services might have built-in re-encoding capabilities to ensure compatibility or optimize playback for a particular device or network condition.

While retranscoding can sometimes be a necessary step for compatibility or optimization, performing it unnecessarily can lead to a degradation of media quality. Each time a file is re-encoded, some data is lost, especially with lossy compression codecs. This cumulative loss can result in a noticeable decrease in picture sharpness, audio clarity, or an increase in compression artifacts. Therefore, it is generally advisable to avoid retranscoding if the original file format and quality are sufficient for the intended use. Understanding the settings of media software and being mindful of file conversion processes can help prevent unwanted retranscoding.