Are you by chance using Ubuntu 9.10? Perhaps you found the relevant bug report for Ubuntu:
https://bugs.launchpad.net/ubuntu/+source/libdc1394-22/+bug/462453. Comment #8 has a permanent solution.

The error message is annoying, but shouldn't cause any real problems.

Cheers,
Patrick

On Mon, Nov 15, 2010 at 5:36 AM, Prasad Dixit <abhimohpra@gmail.com> wrote:

hello all,

I get an error message when i start launching face detector

roslaunch face_detector face_detector.wide.launch

starting new master (master configured for auto start)
process[master]: started with pid [4172]
ROS_MASTER_URI=http://rootx-laptop:11311/

setting /run_id to e471be2a-f0bc-11df-89e5-f04da28296e0
process[rosout-1]: started with pid [4185]
started core service [/rosout]
process[stereoproc-2]: started with pid [4197]
process[face_detector-3]: started with pid [4198]
libdc1394 error: Failed to initialize libdc1394
libdc1394 error: Failed to initialize libdc1394
[ INFO] [1289827992.793279584]: Constructing FaceDetector.
[ INFO] [1289827992.907481864]: Subscribed to the person filter messages.

I found similar error in forum but could not get much benefit out of it.an
Any solution to this?

I tried load a module also,
sudo modprobe raw1394

ls -la /dev/raw1394
output:
crw-rw---- 1 root root 171, 0 2010-11-15 18:34 /dev/raw1394

-Prasad
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