[Jeremy Collins] "How do professionals get a 3 hour movie onto a single, standard DVD with no quality loss?"
They use very high quality source material.
They use the very best MPEG-2 transcoders
They use 2 pass VBR
and int he case of a 3 hour movie, they use a dual layer DVD. - DVD9
http://en.wikipedia.org/wiki/DVD#Dual-layer_recording
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