Ya he solucionado el problema del tamaño de disco que mostraba BDInfo. No tenía la película bien pasada al disco duro. Ahora sí:

Código:
DISC INFO:

Disc Title:     BAIT 3D
Disc Size:      23.050.926.333 bytes
Protection:     AACS
BD-Java:        No
Extras:         50Hz Content, Blu-ray 3D
BDInfo:         0.5.8

PLAYLIST REPORT:

Name:                   00000.MPLS
Length:                 1:33:05.580 (h:m:s.ms)
Size:                   20.482.437.120 bytes
Total Bitrate:          29,34 Mbps

VIDEO:

Codec                   Bitrate             Description     
-----                   -------             -----------     
MPEG-4 AVC Video        18779 kbps          1080p / 23,976 fps / 16:9 / High Profile 4.1
MPEG-4 MVC Video        7500 kbps                           

AUDIO:

Codec                           Language        Bitrate         Description     
-----                           --------        -------         -----------     
DTS Audio                       Spanish         768 kbps        5.1 / 48 kHz / 768 kbps / 16-bit
DTS Audio                       English         768 kbps        5.1 / 48 kHz / 768 kbps / 16-bit

SUBTITLES:

Codec                           Language        Bitrate         Description     
-----                           --------        -------         -----------     
Presentation Graphics           Spanish         19,331 kbps                     

FILES:

Name            Time In         Length          Size            Total Bitrate   
----            -------         ------          ----            -------------   
00000.SSIF      0:00:00.000     1:33:05.580     20.482.437.120  29.336          

CHAPTERS:

Number          Time In         Length          Avg Video Rate  Max 1-Sec Rate  Max 1-Sec Time  Max 5-Sec Rate  Max 5-Sec Time  Max 10Sec Rate  Max 10Sec Time  Avg Frame Size  Max Frame Size  Max Frame Time  
------          -------         ------          --------------  --------------  --------------  --------------  --------------  --------------  --------------  --------------  --------------  --------------  
1               0:00:00.000     0:12:08.644     19.285 kbps     46.401 kbps     00:08:10.406    31.393 kbps     00:03:03.183    27.773 kbps     00:03:42.805    100.538 bytes   927.727 bytes   00:03:46.809    
2               0:12:08.644     0:08:58.037     16.390 kbps     35.644 kbps     00:15:58.540    32.343 kbps     00:12:18.821    28.266 kbps     00:15:55.871    85.451 bytes    733.638 bytes   00:16:04.880    
3               0:21:06.682     0:11:19.762     21.149 kbps     37.265 kbps     00:28:08.353    32.029 kbps     00:28:07.519    28.377 kbps     00:28:04.474    110.261 bytes   630.800 bytes   00:26:34.634    
4               0:32:26.444     0:10:48.898     19.405 kbps     56.793 kbps     00:37:21.572    33.314 kbps     00:35:13.444    30.277 kbps     00:32:26.444    101.171 bytes   687.239 bytes   00:33:22.208    
5               0:43:15.342     0:08:51.155     20.546 kbps     38.185 kbps     00:50:10.048    31.444 kbps     00:50:06.086    29.011 kbps     00:50:04.376    107.116 bytes   801.916 bytes   00:46:00.924    
6               0:52:06.498     0:10:45.019     19.641 kbps     45.248 kbps     00:58:15.950    32.423 kbps     01:00:37.425    29.539 kbps     00:54:37.107    102.401 bytes   740.693 bytes   00:53:22.490    
7               1:02:51.517     0:14:37.585     18.839 kbps     43.466 kbps     01:13:18.852    32.097 kbps     01:03:34.727    25.663 kbps     01:03:34.769    98.218 bytes    653.419 bytes   01:14:52.154    
8               1:17:29.102     0:15:36.477     15.954 kbps     36.638 kbps     01:24:46.206    30.737 kbps     01:18:20.487    28.448 kbps     01:26:28.099    83.179 bytes    720.043 bytes   01:26:37.192    

QUICK SUMMARY:

Disc Title: BAIT 3D
Disc Size: 23.050.926.333 bytes
Protection: AACS
BD-Java: No
Playlist: 00000.MPLS
Size: 20.482.437.120 bytes
Length: 1:33:05.580
Total Bitrate: 29,34 Mbps
Video: MPEG-4 AVC Video / 18779 kbps / 1080p / 23,976 fps / 16:9 / High Profile 4.1
Video: MPEG-4 MVC Video / 7500 kbps / 
Audio: Spanish / DTS Audio / 5.1 / 48 kHz / 768 kbps / 16-bit
Audio: English / DTS Audio / 5.1 / 48 kHz / 768 kbps / 16-bit
Subtitle: Spanish / 19,331 kbps