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The heterogeneous structure of the Internet is a great obstacle for establishing real-time video services. Scalable video codecs, generating bit-streams decodable at di erent rates, have been proposed to address the heterogeneity problem. In this paper, we will review standardcompliant and non-compliant codec architectures for Internet video-ondemand. For compression based on the H.263 standard, we h a ve developed a compatible architecture that allows to switch b e t ween preencodeddoi:10.1007/978-1-4471-0859-7_45 fatcat:wnrndswdpvenlherzk7ke7sio4