bag-info¶

Obtaining bag-info¶

Binaries of the bag-info program can be downloaded from the continuous integration server for versions 0.4 and 0.5 of the Robotics Service Bus:

• 0.4 i686
• 0.4 x86_64
• 0.5 i686
• 0.5 x86_64

After the download, the bag-info file has to be made executable in most cases. This can be done for example by executing

chmod +x bag-info

in the download directory.

Checking Versions and Displaying Help¶

Version and help information is displayed when the --version and --help commandline options are specified:

./bag-info --version
./bag-info --help

The output of --help includes a list of supported file formats.

Inspecting a File¶

When invoked with just a file name, bag-info will display some basic information about the stored data. For example

./bag-info /tmp/nao.tide

should produce output similar to the following:

File "/tmp/nao.tide" 
  Events: 160
  Start : 2011-08-21T18:15:54.088877+02:00
  End   : 2011-08-21T18:16:05.445361+02:00
  Channel "/nao/proprioception/" 
    Events: 51
    Start : 2011-08-21T18:15:54.932970+02:00
    End   : 2011-08-21T18:16:05.319996+02:00
    Length: 10.387026d0
    Rate  : 4.909971343096666d0
  Channel "/nao/audio/all/" 
    Events: 63
    Start : 2011-08-21T18:15:54.868080+02:00
    End   : 2011-08-21T18:16:05.445361+02:00
    Length: 10.577281d0
    Rate  : 5.956162079838855d0
  Channel "/nao/vision/top/" 
    Events: 46
    Start : 2011-08-21T18:15:54.088877+02:00
    End   : 2011-08-21T18:16:04.616276+02:00
    Length: 10.527398999999999d0
    Rate  : 4.369550351421087d0

Note: the file extension ("tide" in this case) determines the used file format backend. Currently, only the TIDELog file format is supported.