+=====[ Packetization unit (PU) #1 ]====+
|           Video support box           |  SEP counter=0
|  +---------------------------------+  |  P counter=0
|  :      Sub boxes of the VS box    :  |
|  +---------------------------------+  |
+- - - - - - - - - - - - - - - - - - - -+
|        Color specification box        |
|  +---------------------------------+  |
|  :      Fields of the CS box       :  |
|  +---------------------------------+  |
+- - - - - - - - - - - - - - - - - - - -+
|          JPEG XS codestream           |
:             (part 1/q)                :  M=0, K=0, L=0, I=00
+---------------------------------------+
|          JPEG XS codestream           |  SEP counter=0
|             (part 2/q)                |  P counter=1
:                                       :  M=0, K=0, L=0, I=00
+---------------------------------------+
|          JPEG XS codestream           |  SEP counter=0
|             (part 3/q)                |  P counter=2
:                                       :  M=0, K=0, L=0, I=00
+---------------------------------------+
:                                       :
+---------------------------------------+
|          JPEG XS codestream           |  SEP counter=1
|            (part 2049/q)              |  P counter=0
:                                       :  M=0, K=0, L=0, I=00
+---------------------------------------+
:                                       :
+---------------------------------------+
|          JPEG XS codestream           |  SEP counter=(q-1) div 2048
|             (part q/q)                |  P counter=(q-1) mod 2048
:                                       :  M=1, K=0, L=1, I=00
+=======================================+