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Does the decoder need an IDR to start decoding or it can start decoding from any random point?

April 26, 2017decoder decoding idr point

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Does the decoder need an IDR to start decoding or it can start decoding from any random point?

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The decoder does not need an IDR to start decoding the sequence. It can start decoding from any frame assuming the reference to be 128. Of course, there will be error propagation because of this. The decoder will then re-sync once an IDR or a picture with Recovery Point SEI is received.