Can't read bagfile containing custom messages

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I have a bag file with video and imu data defined with custom messages that I want to read (especially topics /capture and /imu_raw). I know from documentation what the structure of the custom messages is. How can I read the data?

Doing rosbag info on the file shows:

types:    
libks/ImageSet             [b3ef08c9cff052c83f5039d098add069] 
pximu/AttitudeData         [bc609da5ddac9016c096c67da33d8b9c] 
pximu/RawIMUData           [0380911195329d307d8f033bc714dbbf] 
[...]

topics:  
/attitude                2174 msgs    : pximu/AttitudeData 
/capture                 3282 msgs    : libks/ImageSet  
/imu_raw                 10873 msgs   : pximu/RawIMUData
[...]

I cannot play the file with 'rosbag play', probably because rosbag doesn't know the message definitions. Therefore, I thought I needed to use migration(see http_wiki_ros_org/rosbag_migration) and provide custom message definitions (see http_wiki_ros_org/msg) and use them in a rule file. I made a new package 'bag_analyser", and added the custom messages to the 'msg' folder and compiled. E.g. for ImageSet I made a file ImageSet.msg:

Header header
sensor_msgs/Image[] images

This seems to work, e.g. for ' rosmsg show bag_analyser/ImageSet' I get:

std_msgs/Header header
uint32 seq
time stamp
string frame_id
sensor_msgs/Image[] images
std_msgs/Header header
uint32 seq
time stamp
string frame_id
uint32 height
uint32 width
string encoding
uint8 is_bigendian
uint32 step
uint8[] data

I also made messages for RawIMUData and AttitudeData. Then I generated a rules file (rules.bmr, see full output at end), adjusted the rules that needed to be adjusted and executed:

rosbag fix original_bag.bag converted_bag.bag rules.bmr

which told me "bag migrated successfully". Doing rosbag info on the converted file gives me:

types:       bag_analyser/AttitudeData       [bc609da5ddac9016c096c67da33d8b9c]
             bag_analyser/ImageSet           [b3ef08c9cff052c83f5039d098add069]
             bag_analyser/RawIMUData         [0380911195329d307d8f033bc714dbbf]
[...]
topics:      /attitude                     2174 msgs    : bag_analyser/AttitudeData      
             /capture                      3282 msgs    : bag_analyser/ImageSet          
             /imu_raw                     10873 msgs    : bag_analyser/RawIMUData

My problem is that I still cannot read the file. I tried using 'rosbag play' but it simply gives me:

[ INFO] [1402332944.127314834]: Opening converted_bag.bag
[FATAL] [1402332944.127848761]: Error opening file: converted_bag.bag

I also tried reading in the file using the rosbag API, which also fails opening the file (code in image_converter.cpp below). I changed the bagfile's permissions and set it to allow read/write/execute just to make sure it wasn't that. What am I doing wrong? How can I read the data from the file? I am fairly new to ROS, so any help or tips are greatly appreciated!

File listings:

folder bag/analyser/msg

ImageSet.msg

Header header    
sensor_msgs/Image[] images

RawIMUData.msg

Header header
# Measured accelerations (in x, y, z)
Vector3f acc

# Measured angular speeds (around x, y, z)
Vector3f gyro

# Measured magnetic field (around x , y, z)
Vector3f mag

Vector3f.msg

float32 x
float32 y
float32 z

AttitudeData.msg

Header header

# roll angle [rad]
float32 roll

# pitch angle [rad]
float32 pitch

# yaw angle [rad]
float32 yaw

# roll angular speed [rad/s]
float32 rollspeed

# pitch angular speed [rad/s]
float32 pitchspeed

# yaw angular speed [rad/s]
float32 yawspeed

bag_analyser/image_converter.cpp ( includes message definition for ImageSet.h and tries to use rosbag API to read file):

#include <ros/ros.h>
#include <rosbag/bag.h>
#include ...