The difference between NAL HRD and VCL HRD is whether SPS/PPS/SEIs are counted or not in HRD calculations.
In NAL HRD mode all non-VLC NALs (i.e. SPS, PPS, SEIs) as well as VCL NALs (i.e. Slices) are counted in HRD while in VCL HRD mode non-VCL NALs are ignored (consequently in VCL HRD mode access unit may be smaller than that in NAL HRD).
In my opinion the reason for existing of VCL HRD mode: in some applications SPS/PPS are given a priory or signaled out-of-band, therefore there is no sense to include these NALs in HRD process.
23+ years’ programming and theoretical experience in the computer science fields such as video compression, media streaming and artificial intelligence (co-author of several papers and patents).
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