Most DVDs exhibit few visible MPEG compression artifacts on a properly configured system.
Compatible replay of standard definition cassettes Betacam, Betacam SP, Betacam SX, MPEG IMX and Digital Betacam cassettes can be replayed.
This is because MPEG digitally compresses signals down to a fraction of their bandwidth size.
The special set-top box is quite " stupid "; it just decodes the MPEG streams.
MPEG decoders convert the compacted tokens back into something resembling the original video stream.