[Mp4-tech] [H.264] Re: nal_ref_idc

[Shih-Huang Chang]

Yes, it only needs one bit if nal_ref_idc is regarded as referenced or 
not.  However, you could find in JM code that nal_ref_idcs of SPS, PPS and 
IDR are set as 3, higher priority given.  That means two bits of 
nal_ref_idc could give us more flexibility to deal with all kinds of NAL 
units.
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