Coded Video Sequences
A coded video sequence consists of a series of access units that are sequential in the NAL unit stream and use only one sequence parameter set. Each coded video sequence can be decoded independently of any other coded video sequence, given the necessary parameter set information, which may be conveyed "in-band" or "out-of-band". At the beginning of a coded video sequence is an instantaneous decoding refresh (IDR) access unit. An IDR access unit contains an intra picture -a coded picture that can be decoded without decoding any previous pictures in the NAL unit stream, and the presence of an IDR access unit indicates that no subsequent picture in the stream will require reference to pictures prior to the intra picture it contains in order to be decoded. A NAL unit stream may contain one or more coded video sequence.
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