# 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.

## 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 Launch Files?

- Different cameras have varying default resolutions and image formats.
- To simplify usage, each camera has its own launch file.