For outstanding coding efficiency with scalability functions, SVC (Scalable Video Coding) is being standardized.
SVC can support spatial, temporal and SNR scalability and these scalabilities are useful to provide a smooth video
streaming service even in a time varying network such as a mobile environment. But current SVC is insufficient to
support dynamic video conversion with scalability, thereby the adaptation of bitrate to meet a fluctuating network
condition is limited. In this paper, we propose dynamic full-scalability conversion methods for QoS adaptive video
streaming in SVC. To accomplish full scalability dynamic conversion, we develop corresponding bitstream extraction,
encoding and decoding schemes. At the encoder, we insert the IDR NAL periodically to solve the problems of spatial
scalability conversion. At the extractor, we analyze the SVC bitstream to get the information which enable dynamic
extraction. Real time extraction is achieved by using this information. Finally, we develop the decoder so that it can
manage the changing scalability. Experimental results showed that dynamic full-scalability conversion was verified and
it was necessary for time varying network condition.