How to parse rosbags split between multiple DB3 files using ros2bagreader?

I am trying to use the "ros2bagreader" function to directly parse rosbags where the messages are split between multiple DB3 files and the initial argument is the directory. How can I open each file?

Answer 1

[MathWorks Support Team]

The ability to directly parse a directory with multiple DB3 files is not available as of release R2022b.

However, to work around this, you can either:

1. Specify each individual DB3 file separately, using the path to each file. 
2. Combine the segmented BAG files into one large BAG file.

[Snehal]

Update:

In MATLAB R2023b and later versions, you can parse multiple DB3 files within a common folder directly by specifying the ‘folderpath’ as a folder. Ensure that you have read and write access to the bag folder that contains the DB3 files.

Refer to the following documentation link for more details:

https://www.mathworks.com/help/releases/R2023b/ros/ref/ros2bagreader.html?searchHighlight=ros2bagreader&s_tid=doc_srchtitle#:~:text=You%20can%20also%20read%20all%20the%20DB3%20files%20in%20the%20bag%20folder%20by%20specifying%20the%20folderpath%20as%20a%20folder.%20Ensure%20that%20you%20have%20read%20and%20write%20access%20to%20the%20bag%20folder%20that%20contains%20the%20DB3%20files.