Hi Dan,

You might need to increase the size of the queues used by the subscriber filters and/or the synchronizer. If those queues fill up, messages can get bumped off before they form a complete synchronized set.

For debugging purposes it can be useful to register another callback to the subscriber filters, just so you know when they get any data. I've attached some sample source code.

"compressed" transport definitely should work with the time synchronizer. "theora" will not work reliably because it seems the plugin doesn't retain the timestamp of the original image. I've opened a ticket for that.

HTH,
Patrick

On Fri, Mar 12, 2010 at 9:12 AM, Dan Lazewatsky <lazewatskyd@cse.wustl.edu> wrote:

Thanks, that did the trick. One thing I'm still having trouble with is getting transports other than raw to work with image_transport::SubscriberFilter. If I pass image_transport::TransportHints th(transport) to image_transport::SubscriberFilter, where transport is "compressed" or "theora", I never seem to get any data. rxgraph -t shows that my node is connected to my image publisher on the right topic, but the callback never gets called.

Thanks,
-Dan

On 3/11/10 5:11 PM, Patrick Mihelich wrote:
On Thu, Mar 11, 2010 at 2:55 PM, Dan Lazewatsky <lazewatskyd@cse.wustl.edu> wrote:

On a related note, is there a way to use TimeSynchronizer with image_transport rather than subscribing to the image directly?

Use image_transport::SubscriberFilter as a drop-in replacement for message_filters::Subscriber. It uses an image_transport subscriber under the hood.

Cheers,
Patrick
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