[ros-users] working with compressed bag files?

[Tim Field]

The problem with gzipping an entire bag file is you lose the ability to do
random access.  We're working on a new bag format for rosbag which
internally uses compression and permits random access.  This is slated for
ROS 1.1.3.

For images, one option to consider is storing CompressedImage messages in
your bag files (see compressed_image_transport).  A domain specific
compression algorithm is always going to beat a generic one such as gzip.

Tim

On Sat, Apr 10, 2010 at 5:22 PM, Jack O'Quin <jack.oquin at gmail.com> wrote:

> Is there a rosbag option to read and write gzipped bag files?
>
> That would be useful. With images and point clouds bags can get really
> large, and gzip can compress them quite a lot.
> --
>  joq
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