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en/_sources/source/8_FAQ/FAQ.md.txt

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+# Frequently Asked Questions
+
+### 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.
+
+### 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:
+
+```
+    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 Launch Files?
+
+- Different cameras have varying default resolutions and image formats.
+- To simplify usage, each camera has its own launch file.