8.5.2. Gradual Recovery Procedure to Respond to a Request for a Decoder Refresh Point
8.5.2. Gradual Recovery Procedure to Respond to a Request for a Decoder Refresh Point
This section gives another possible way to respond to a request for a decoder refresh point.
The encoder shall, in the order presented here:
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Send a recovery point SEI message (see Sections D.1.7 and D.2.7 of [1]).
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Repeat any sequence and picture parameter sets that were sent before the recovery point SEI message, prior to their reference by a NAL unit.
The encoder shall ensure that the decoder has access to all reference pictures for inter prediction of pictures at or after the recovery point, which is indicated by the recovery point SEI message, in output order, assuming that the transmission from now on is error- free.
The value of the recovery_frame_cnt syntax element in the recovery point SEI message should be small enough to ensure a fast recovery.
As needed, such parameter sets may be re-sent in a batch, one at a time, or in any combination of these two methods. Parameter sets may be re-sent at any time for redundancy. Caution should be taken when parameter set updates are present, as described above in Section 8.4.