AudioData messages (audio_common_msgs) empty when echoing /audio or subscribing to /audio in python script

[ameliefroessl]

Hi,

I'm experiencing a very weird problem. I have no idea how this is happening, but maybe you can help me out. When I echo the /audio topic played back either from a bag file or publishing the audiodata live, echo will be completely empty and trying to connect to the topic via python subscriber, the callback is never even called. However, rostopic hz /audio indicates that there are messages coming through. Also, rqt_bag shows me there are messages in the bag. I can also rerecord what's in the bag and the recorded bag also has those messages when I check them in rqt. I can also publish and subscribe to std_msgs/UInt8MultiArray messages, which have the same byte data field (uint8[]) as the AudioData messages.

I am able to see the messages and subscribe to the topic on a different machine. I'm running Ubuntu 18 on both and installed is ROS melodic. I checked on the machine for which all of this works, audio_common_msgs 0.3.7 is installed and on the machine it does not work I have audio_common_msgs 0.3.9, if that is relevant...

Thanks for any help !

[knorth55]

can you share us the rosbag file and how to reproduce your error?

[ameliefroessl]

Hi yes attached you can find the bagfile and you can simply play the bag with rosbag play test_1.bag and then try rostopic echo /audio

test_1.zip

[knorth55]

I could echo /audio message with the rosbag, and I could not reproduce your problem... I'm using origin/master branch with kinetic.

$ rostopic echo -n1 /audio
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---

[ameliefroessl]

Ok thanks for trying... I think I installed audio_common via : sudo apt-get install ... Do you have any ideas what might cause this issue?.. I'm slowly running out of ideas...

[knorth55]

sorry, but i have no idea...

[ameliefroessl]

Ok So i think i found where the problem comes from. I tried it again on a different machine with the same setup. Ubuntu 18 and ros melodic. I installed audio_common through sudo apt install ros-melodic-audio-common. Which gave me the same problem. Then I uninstalled it and built it from source and then it worked. I am not sure what the exact reason was but just so you know...

[knorth55]

I installed audio_common 0.3.9 with apt, but I cannot reproduce the error.

[ameliefroessl]

ok you said you are using kinetic.. i'm using melodic. Maybe that's what's causing the problem?

[knorth55]

maybe it is not the reason.