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<div class=Section1>
<p class=MsoPlainText><font size=1 face="Courier New"><span lang=EN-GB
style='font-size:8.0pt'>Ryan,</span></font></p>
<p class=MsoPlainText><font size=1 face="Courier New"><span lang=EN-GB
style='font-size:8.0pt'> </span></font></p>
<p class=MsoPlainText><font size=1 face="Courier New"><span lang=EN-GB
style='font-size:8.0pt'>> > > This gets even worse when slices can be
out of order across picture</span></font></p>
<p class=MsoPlainText><font size=1 face="Courier New"><span style='font-size:
8.0pt'>> > > boundaries. I have searched high and low the spec and I
cannot find a</span></font></p>
<p class=MsoPlainText><font size=1 face="Courier New"><span style='font-size:
8.0pt'>> > > statement that precludes this from happening. (Of course,
due to the</span></font></p>
<p class=MsoPlainText><font size=1 face="Courier New"><span style='font-size:
8.0pt'>> > > lack</span></font></p>
<p class=MsoPlainText><font size=1 face="Courier New"><span style='font-size:
8.0pt'>> > > of plain English in the spec it could be there.)</span></font></p>
<p class=MsoPlainText><font size=1 face="Courier New"><span style='font-size:
8.0pt'>> ></span></font></p>
<p class=MsoPlainText><font size=1 face="Courier New"><span style='font-size:
8.0pt'>> > I will check if that is possible, but I definitely do not
believe it is!</span></font></p>
<p class=MsoPlainText><font size=1 face="Courier New"><span style='font-size:
8.0pt'>> > And yes, this standard is not that easy to read :-)</span></font></p>
<p class=MsoPlainText><font size=1 face="Courier New"><span style='font-size:
8.0pt'>> </span></font></p>
<p class=MsoPlainText><font size=1 face="Courier New"><span style='font-size:
8.0pt'>> Please do check as I would love to be proven wrong on this one. </span></font></p>
<p class=MsoPlainText><font size=1 color=black face="Courier New"><span
style='font-size:8.0pt;color:black'> </span></font></p>
<p class=MsoPlainText><font size=1 color=black face="Courier New"><span
lang=EN-GB style='font-size:8.0pt;color:black'>What about paragraph 7.4.1.2.3 (I
LOOOVE documents with 5 level nesting)</span></font></p>
<p class=MsoPlainText><font size=1 color=black face="Courier New"><span
lang=EN-GB style='font-size:8.0pt;color:black'> </span></font></p>
<p class=MsoPlainText><font size=1 color=black face="Courier New"><span
lang=EN-GB style='font-size:8.0pt;color:black'> </span></font></p>
<h5 style='margin-left:36.0pt;text-indent:-36.0pt'><a name="_Toc94713197"></a><a
name="_Ref35694632"><b><font size=2 face="Times New Roman"><span lang=EN-GB
style='font-size:10.0pt'>7.4.1.2.3<font size=1 face="Times New Roman"><span
style='font:7.0pt "Times New Roman"'> </span></font></span></font></b><span
lang=EN-GB> Order of NAL units and coded pictures and association to
access units</span></a></h5>
<p class=MsoNormal><font size=3 face="Times New Roman"><span lang=EN-GB
style='font-size:12.0pt'>An access unit consists of one primary coded picture,
zero or more corresponding redundant coded pictures, and zero or more non-VCL
NAL units. The association of VCL NAL units to primary or redundant coded
pictures is described in subclause </span></font><span
lang=EN-GB>7.4.1.2.5</span><span lang=EN-GB>. </span></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span lang=EN-GB
style='font-size:12.0pt'>The first access unit in the bitstream starts with the
first NAL unit of the bitstream.</span></font></p>
<p class=MsoNormal><font size=3 color=red face="Times New Roman"><span
lang=EN-GB style='font-size:12.0pt;color:red'>The first of any of the following
NAL units after the last VCL NAL unit of a primary coded picture specifies the
start of a new access unit.</span></font></p>
<p class=MsoNormal style='margin-right:0cm;margin-bottom:0cm;margin-left:18.0pt;
margin-bottom:.0001pt;text-align:justify;text-indent:-18.0pt;punctuation-wrap:
simple;text-autospace:none;vertical-align:baseline'><font size=3
face="Times New Roman"><span lang=EN-GB style='font-size:12.0pt'>-<font size=1
face="Times New Roman"><span style='font:7.0pt "Times New Roman"'>
</span></font></span></font><span lang=EN-GB>access unit delimiter NAL unit
(when present)</span></p>
<p class=MsoNormal style='margin-right:0cm;margin-bottom:0cm;margin-left:18.0pt;
margin-bottom:.0001pt;text-align:justify;text-indent:-18.0pt;punctuation-wrap:
simple;text-autospace:none;vertical-align:baseline'><font size=3
face="Times New Roman"><span lang=EN-GB style='font-size:12.0pt'>-<font size=1
face="Times New Roman"><span style='font:7.0pt "Times New Roman"'>
</span></font></span></font><span lang=EN-GB>sequence parameter set NAL unit
(when present)</span></p>
<p class=MsoNormal style='margin-right:0cm;margin-bottom:0cm;margin-left:18.0pt;
margin-bottom:.0001pt;text-align:justify;text-indent:-18.0pt;punctuation-wrap:
simple;text-autospace:none;vertical-align:baseline'><font size=3
face="Times New Roman"><span lang=EN-GB style='font-size:12.0pt'>-<font size=1
face="Times New Roman"><span style='font:7.0pt "Times New Roman"'>
</span></font></span></font><span lang=EN-GB>picture parameter set NAL unit
(when present)</span></p>
<p class=MsoNormal style='margin-right:0cm;margin-bottom:0cm;margin-left:18.0pt;
margin-bottom:.0001pt;text-align:justify;text-indent:-18.0pt;punctuation-wrap:
simple;text-autospace:none;vertical-align:baseline'><font size=3
face="Times New Roman"><span lang=EN-GB style='font-size:12.0pt'>-<font size=1
face="Times New Roman"><span style='font:7.0pt "Times New Roman"'>
</span></font></span></font><span lang=EN-GB>SEI NAL unit (when present)</span></p>
<p class=MsoNormal style='margin-right:0cm;margin-bottom:0cm;margin-left:18.0pt;
margin-bottom:.0001pt;text-align:justify;text-indent:-18.0pt;punctuation-wrap:
simple;text-autospace:none;vertical-align:baseline'><font size=3
face="Times New Roman"><span lang=EN-GB style='font-size:12.0pt'>-<font size=1
face="Times New Roman"><span style='font:7.0pt "Times New Roman"'>
</span></font></span></font><span lang=EN-GB>NAL units with nal_unit_type in
the range of 14 to 18, inclusive</span></p>
<p class=MsoNormal style='margin-right:0cm;margin-bottom:0cm;margin-left:18.0pt;
margin-bottom:.0001pt;text-align:justify;text-indent:-18.0pt;punctuation-wrap:
simple;text-autospace:none;vertical-align:baseline'><font size=3 color=red
face="Times New Roman"><span lang=EN-GB style='font-size:12.0pt;color:red'>-<font
size=1 face="Times New Roman"><span style='font:7.0pt "Times New Roman"'>
</span></font></span></font><font color=red><span lang=EN-GB style='color:red'>first
VCL NAL unit of a primary coded picture (always present)</span></font></p>
<p class=MsoPlainText><font size=1 color=black face="Courier New"><span
lang=EN-GB style='font-size:8.0pt;color:black'> </span></font></p>
<p class=MsoPlainText><font size=1 color=black face="Courier New"><span
lang=EN-GB style='font-size:8.0pt;color:black'> </span></font></p>
<p class=MsoPlainText><font size=1 color=black face="Courier New"><span
lang=EN-GB style='font-size:8.0pt;color:black'> </span></font></p>
<p class=MsoPlainText><font size=1 color=black face="Courier New"><span
lang=EN-GB style='font-size:8.0pt;color:black'>I think this should prove that
access units can not be mixed. It’s hard to be sure though...</span></font></p>
<p class=MsoPlainText><font size=1 color=black face="Courier New"><span
lang=EN-GB style='font-size:8.0pt;color:black'> </span></font></p>
<p class=MsoPlainText><font size=1 color=black face="Courier New"><span
lang=EN-GB style='font-size:8.0pt;color:black'>Regards</span></font></p>
<p class=MsoPlainText><font size=1 color=black face="Courier New"><span
lang=EN-GB style='font-size:8.0pt;color:black'>
Peter</span></font></p>
<p class=MsoPlainText><font size=1 color=black face="Courier New"><span
lang=EN-GB style='font-size:8.0pt;color:black'> </span></font></p>
<p class=MsoPlainText><font size=1 face="Courier New"><span lang=EN-GB
style='font-size:8.0pt'> </span></font></p>
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