This results in a loss of detail, and is generally considered inferior to using an encoder to compress video. Rather than recalculate all the information required by an encoder, a compressed domain transcoder simply removes information from the original video stream. Compressed Domain Transcoding Compressed Domain Transcoding is used by many popular DVD backup programs. In other words, once the video is stored digitally, encoding to another format, or even re-encoding to the same format is transcoding. Technically transcoding means starting with encoded video and encoding it again. This is the method used by programs like DVD Shrink and CloneDVD to compress DVD video. Transcoding usually refers to compressed domain transcoding.
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