Can't save Inference resuluts on Docker container on P1467

[Ajiro3]

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Before opening an issue

Issue Checklist

• [ x] I have checked the compatibility table in the documentation.
• [x ] I have verified that the SDK version I am using is compatible with the firmware version installed on my device.
• [ x] I have included the SDK version and firmware version in my issue description for reference.
• [ x] I have followed the minimum debug steps on my own.
• [ x] I have included the output of the debug steps in the issue.

1. Set up
   $env:CHIP="artpec8"

Environment

• Axis device model: P1467-LE
• Axis device firmware version: 12.1.64
• Stack trace or logs: [e.g. Axis device system logs]
• OS and version: [Windows build 19045.5247]
• Version: [version of the application, SDK, runtime environment, package manager, interpreter, compiler, depending on what seems relevant]

Additional context

I defined "out_video" folder under the root folder and chaged its mode 777 in the Dockerfile for the detector.py as follows;

Directory for output and change mode

RUN mkdir -p /out_video
RUN chmod -R 777 /out_video

I wrote to save the inference result as follows;
fourcc = cv2.VideoWriter_fourcc(*'mp4v')
out = cv2.VideoWriter('/out_video/detected_video.mp4', fourcc, fps, (frame_width, frame_height))

I ivoked docker-compose to run detector.py on P1467 cam with docker-composer.yml after cleaning the docker memory up.
I defined "/out_video" in volumes for services of object-detection-python as follows;
volumes:
- /usr/lib/libvdostream.so.1:/usr/lib/libvdostream.so.1
- acap-dl-models:/models:ro
- /out_video:/out_video:rw
- /var/run/dbus:/var/run/dbus:rw
- inference-server:/tmp
But docker terminated with the following message.
Error response from daemon: error while creating mount source path '/out_video': mkdir /out_video: read-only file system

So I set it as "# - /out_video:/out_video:rw", docker-compose run properly and showed the message as folows;
object-detector-python-1 | 0 Objects found
object-detector-python-1 | Time for call to inference-server: 36 ms
object-detector-python-1 | 0 Objects found
object-detector-python-1 | Processed video saved to ./out_video/detected_video.mp4
object-detector-python-1 | Processed video saved to ./out_video/detected_video.mp4 (size: 1.68 MB)
object-detector-python-1 | Video copied to /out_video/detected_video.mp4
object-detector-python-1 exited with code 0

When I accessed to the docker container of detector.py, there exists "out_video" folder under root but it is empty.

Please let me know the way to save the iference results on the docker container of P1467.

Masataka