Inconsistancy.  The number of frames per region is not constant.
Inconsistancy.  Too few frames within a single region.
 1         11         58
 2         59         88

 1         11         58
 2         59         88

 1       3546         11         23         35         47
 1       3547         12         24         36         48
 1       3548         13         25         37         49
 1       3549         14         26         38         50
 1       3431         15         27         39         51
 1       3311         16         28         40         52
 1       3310         17         29         41         53
 1       3430         18         30         42         54
 1       3309         19         31         43         55
 1       3429         20         32         44         56
 1       3308         21         33         45         57
 1       3428         22         34         46         58

 2       3432         59         72         85
 2       3433         60         73         86
 2       3434         61         74         87
 2       3315         62         75         88
 2       3316         63         76
 2       3317         64         77
 2       3195         65         78
 2       3194         66         79
 2       3193         67         80
 2       3192         68         81
 2       3314         69         82
 2       3313         70         83
 2       3312         71         84