Inconsistancy.  The number of frames per region is not constant.
Inconsistancy.  Too few frames within a single region.
 1         11         54
 2         55         96

 1         11         54
 2         55         96

 1       3028         11         22         33         44
 1       3152         12         23         34         45
 1       3274         13         24         35         46
 1       3275         14         25         36         47
 1       3276         15         26         37         48
 1       3277         16         27         38         49
 1       3278         17         28         39         50
 1       3156         18         29         40         51
 1       3155         19         30         41         52
 1       3154         20         31         42         53
 1       3153         21         32         43         54

 2       3775         55         79
 2       3776         56         80
 2       3777         57         81
 2       3778         58         82
 2       3665         59         83
 2       3664         60         84
 2       3663         61         85
 2       3547         62         86
 2       3548         63         87
 2       3549         64         88
 2       3431         65         89
 2       3430         66         90
 2       3429         67         91
 2       3309         68         92
 2       3310         69         93
 2       3311         70         94
 2       3190         71         95
 2       3189         72         96
 2       3188         73
 2       3187         74
 2       3308         75
 2       3428         76
 2       3546         77
 2       3662         78