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docs/source/7_help_center/FAQ.md

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+# FAQ
+
+## Unexpected crash
+
+If the camera node crashes unexpectedly, it will generate a crash log in the current running directory: `Log/camera_crash_stack_trace_xx.log`.
+Please send this log to the support team or submit it to a GitHub issue for further assistance.
+
+**Regarding logging, please refer to the following log recommendations:**
+
+In ROS, the location of the log directory is typically associated with the ROS workspace, but the specific log path may vary depending on the installation method and operating system.
+
+Here are some common locations for ROS log directories:
+
+1. **Default Global ROS Log Directory** : Global logs are typically recorded in the `~/.ros/log` directory. Here, `~` represents the user's home directory.
+2. **Workspace-Specific Log Directories** : In some cases, ROS nodes may log to specific directories within their workspace. This can often be achieved by setting the `ROS_LOG_DIR` environment variable.
+
+For the underlying Orbbec SDK, the log level can be configured via the `log_level` field in the `common.yaml` file.
+
+## How to Quickly Modify the Default Resolution
+
+How to Quickly Modify the Default Resolution, Video Format, and Frame Rate Parameters of a Product?
+
+1.Locate the corresponding product yaml configuration file, such as gemini330_series.yaml, in the orbbec_camera/config directory.
+2.Open the corresponding product yaml configuration file, such as gemini330_series.yaml, and modify the resolution, format, and frame rate settings for the video stream.
+
+For example:
+
+![1733990376409](../image/faq_1.png)
+
+3.Compile and Run
+
+```
+colcon build --event-handlers  console_direct+  --cmake-args  -DCMAKE_BUILD_TYPE=Release
+source install/setup.bash
+ros2 launch orbbec_camera orbbec_camera.launch.py config_file_path:=gemini330_series.yaml
+```
+
+## No data stream from multiple cameras
+
+**Insufficient Power Supply**:
+
+- Ensure that each camera is connected to a separate hub.
+- Use a powered hub to provide sufficient power to each camera.
+
+**High Resolution**:
+
+- Try lowering the resolution to resolve data stream issues.
+
+**Increase usbfs_memory_mb Value**:
+
+- Increase the `usbfs_memory_mb` value to 128MB (this is a reference value and can be adjusted based on your system’s needs)
+  by running the following command:
+
+```bash
+echo 128 | sudo tee /sys/module/usbcore/parameters/usbfs_memory_mb
+```
+
+- To make this change permanent, check [this link](https://github.com/OpenKinect/libfreenect2/issues/807).
+
+## Additional troubleshooting
+
+- If you encounter other issues, set the `log_level` parameter to `debug`. This will generate an SDK log file in the running directory: `Log/OrbbecSDK.log.txt`.
+  Please provide this file to the support team for further assistance.
+- If firmware logs are required, set `enable_heartbeat` to `true` to activate this feature.
+
+## Why are there so many yaml files?
+
+- Different yaml files have varying default resolutions and image formats.
+- To simplify usage, each camera has its own yaml file.