8.5.1. IDR Procedure to Respond to a Request for a Decoder Refresh Point

This section gives one possible way to respond to a request for a decoder refresh point.

The encoder shall, in the order presented here:

Immediately prepare to send an IDR picture.
Send a sequence parameter set to be used by the IDR picture to be sent. The encoder may optionally also send other sequence parameter sets.
Send a picture parameter set to be used by the IDR picture to be sent. The encoder may optionally also send other picture parameter sets.
Send the IDR picture.
From this point forward in time, send any other sequence or picture parameter sets that have not yet been sent in this procedure, prior to their reference by any NAL unit, regardless of whether such parameter sets were previously sent prior to receiving the request for a decoder refresh point. As needed, such parameter sets may be 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.