Fatal error R2020b rosbag . when i call bag = rosbag(filename), it shows "An error occurred when reading from the file." However, it works fine in R2020a.

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chang shu
chang shu 2021-1-27
回答： fang jie 2021-12-8
when i call
bag = rosbag(filename)
it shows "An error occurred when reading from the file."
However, it works fine in R2020a.
this error also affects the normal usage of "SLAM Map Builder" and "Lidar Labeler".
I have test the rosbag file in the help center,
e.g. \Examples\R2020b\ros\RetrieveInformationFromRosbagROSExample\ex_multiple_topics.bag
OK, it works fine.
BUT, why my file raised this error? and it works fine in R2020a.
the test file is attached. Please check it.
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Cris LaPierre
Cris LaPierre 2021-1-27
Ran in:
I have the ability to run the code here using R2020b. See the results below. No error.
Do you have access to MATLAB Online? What happens if you try to run this code there?
unzip('bags.zip')
bag = rosbag("Rosbag Fatal Error.bag")
bag =
BagSelection with properties: FilePath: '/users/mss.system.u02zJA/Rosbag Fatal Error.bag' StartTime: 1.6028e+09 EndTime: 1.6028e+09 NumMessages: 476 AvailableTopics: [2×3 table] AvailableFrames: {0×1 cell} MessageList: [476×4 table]
bag2 = rosbag("2018-06-07-03-58-52.bag")
bag2 =
BagSelection with properties: FilePath: '/users/mss.system.u02zJA/2018-06-07-03-58-52.bag' StartTime: 0 EndTime: 0 NumMessages: 0 AvailableTopics: [0×3 table] AvailableFrames: {} MessageList: [0×4 table]

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回答（3 个）

Tan Shuwen is pig
Tan Shuwen is pig 2021-1-28
I have the same problem after Matlab update.
It works ok in matlab 2020a, but not work in matlab2020b update4.
Tan Shuwen is pig
Tan Shuwen is pig 2021-3-21
I found a solution to the problem, it's very simple, file path of your bag cannot have Chinese character.
fang jie
fang jie 2021-12-8
Hi! I have a question， when I use your bag file there no error, but when I open my bag file with matlab 2019b, the same question come. I don`t know how to solve.
clc,clear all
camera='Camera1';
type=0; %depth=0 / rgb=1;
filepath=fullfile('F:\ele_ladder\code\librealsense-master\librealsense-master\wrappers\python\examples',[camera,'.bag']);
bag=rosbag(filepath);
Command Window
An error occurred when reading from the file.

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