# Stereo interface received non-stereo frame, exiting stereo

Source: https://forum.modalai.com/topic/2460/stereo-interface-received-non-stereo-frame-exiting-stereo
Category: General Questions (https://forum.modalai.com/category/2/general-questions)
Posted: 2023-07-20 16:00:26 UTC by planch98
Replies: 0 · Views: 399

## planch98 · 2023-07-20 16:00:26 UTC

Hi, I'm working with the stereo cameras. The stereo images and the disparity image are shown on *voxl-portal*. After launching *voxl-mpa-to-ros* and subscribing to */stereo_disparity/left* with *rostopic echo*, *voxl-mpa-to-ros* prompt this error: 
```
Stereo interface received non-stereo frame, exiting stereo
```
After that, the topics related to stereo interface (*/stereo_disparity/left*,*/stereo_disparity/right*) disappear. Same happens with */stereo_disparity_scaled/right*

I also tried to visualize the disparity on rviz. In that case the mpa-to-ros crashes with the following:
```
[voxl_mpa_to_ros_node-2] process has died [pid 5846, exit code -11, cmd /opt/ros/melodic/lib/voxl_mpa_to_ros/voxl_mpa_to_ros_node __name:=voxl_mpa_to_ros_node __log:=/home/root/.ros/log/2bfc2770-2715-11ee-9d49-00c0cab15bca/voxl_mpa_to_ros_node-2.log].
log file: /home/root/.ros/log/2bfc2770-2715-11ee-9d49-00c0cab15bca/voxl_mpa_to_ros_node-2*.log
```
Any clue on what is going on?

system-image: 1.5.5-M0054-14.1a-perf
kernel:       #1 SMP PREEMPT Fri Mar 24 00:48:55 UTC 2023 4.19.125
hw version:   M0054
voxl-suite:   0.9.5