Inconsistancy.  The number of frames per region is not constant.
Inconsistancy.  Too few frames within a single region.
 1         11         74
 2         75        108

 1         11         74
 2         75        108

 1       3166         11         27         43         59
 1       3165         12         28         44         60
 1       3164         13         29         45         61
 1       3163         14         30         46         62
 1       3040         15         31         47         63
 1       3041         16         32         48         64
 1       3042         17         33         49         65
 1       2917         18         34         50         66
 1       2916         19         35         51         67
 1       2915         20         36         52         68
 1       2790         21         37         53         69
 1       2791         22         38         54         70
 1       2792         23         39         55         71
 1       2793         24         40         56         72
 1       2918         25         41         57         73
 1       3043         26         42         58         74

 2       3867         75         89        103
 2       3866         76         90        104
 2       3754         77         91        105
 2       3755         78         92        106
 2       3642         79         93        107
 2       3641         80         94        108
 2       3640         81         95
 2       3523         82         96
 2       3524         83         97
 2       3525         84         98
 2       3526         85         99
 2       3527         86        100
 2       3643         87        101
 2       3756         88        102