How to rosbag play images when using theora?

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Hi,

I had exactly the same problem. It seems that when playing the theora compressed data from rosbag, the image_view is not able to connect quickly enough to the advertised topic in order to receive the three critical header frames (0,1,2). These header frames are required to initialize the theora video stream reception.

So at first, start the image view:

rosrun image_view image_view image:=<your image="" topic=""> theora

Then start rosbag with the additional parameter -d SEC that will force the rosbag to sleep SEC seconds after every advertise call (to allow subscribers to connect):

rosbag play <your bag="" file=""> -d 1

You could try to play around with different values. For me, a delay of 1 sec did the trick.

Br, Paul