Can someone please explain the difference between remuxing and re-encoding?

Many thanks

[nvingo]

All day without an explanation!

A Mux or multiplex is a single stream of DATA which is composed of packets of data for various items, eg. video, audio, subtitles.
DeMuxing is the process of extracting these packets and arranging them in individual streams so you have a file with just the video, and another with just the audio. The format (or codec) of the video and audio don't change.

ReMuxing is assembling the packets back into a single multiplex.

ReEncoding is changing some aspect of the format (eg. resolution or codec type) such that it needs to be uncompressed and recompressed. This may need the steps of demuxing and remuxing so that the re-encoding process works on video-only and audio-only streams, rather than trying to re-encode the contents of a multiplex directly.

Thanks - good, clear explanation.