Troubleshooting ARM Rip Failure With Main Feature Enabled

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Introduction

The Automatic Ripping Machine (ARM) is a powerful tool for automatically ripping Blu-rays and DVDs. However, users sometimes encounter issues, such as ripping failures when the "Main Feature" setting is enabled. This article delves into a specific bug report where enabling the "Main Feature" in ARM causes the ripping process to fail. We will explore the issue, its causes, steps to reproduce it, and potential solutions. This comprehensive guide aims to provide both technical insights and practical advice for users facing similar challenges with ARM. Understanding the intricacies of ARM's functionality and troubleshooting common issues can significantly enhance your experience with this tool.

Understanding the Bug: "Main Feature" and Rip Failures

The core issue reported is that enabling the "Main Feature" setting within ARM leads to ripping failures. This setting is designed to extract only the main movie content from a disc, skipping previews, trailers, and other supplementary material. However, in certain configurations, enabling this feature causes the ripping process to halt prematurely, preventing ARM from successfully reading and processing the disc's data. This problem is particularly perplexing because the "Main Feature" setting is intended to streamline the ripping process, not hinder it. Disabling the setting, while allowing the rip to proceed, results in the entire disc being ripped, which includes unwanted content and increases processing time and storage requirements. Thus, understanding and resolving this bug is crucial for optimizing the efficiency and effectiveness of ARM.

Key Aspects of the Issue

  • Symptom: Ripping process fails before reading data when "Main Feature" is enabled.
  • Workaround: Disabling "Main Feature" allows ripping, but it includes all content, not just the main movie.
  • Environment: The issue was reported in a Docker Compose deployment, which, while not officially supported, should ideally function correctly.
  • Error Message: The error logs indicate a TypeError: Logger._log() got an unexpected keyword argument 'num', pointing to a potential issue in how logging is handled when the "Main Feature" is active.

The Importance of "Main Feature"

The "Main Feature" setting is a critical component of ARM for several reasons:

  1. Efficiency: It significantly reduces the time required to rip a disc by focusing solely on the main movie content.
  2. Storage Optimization: Ripping only the main feature saves valuable storage space by excluding unnecessary files.
  3. User Experience: It provides a cleaner, more streamlined viewing experience by avoiding previews and other extraneous content.

Given these benefits, resolving the bug associated with the "Main Feature" is essential for maintaining the utility and appeal of ARM. The ability to quickly and efficiently extract the core movie content is a key differentiator for ARM, and any impediment to this functionality needs to be addressed promptly.

Reproducing the Issue: Step-by-Step Guide

To effectively troubleshoot and resolve the "Main Feature" bug, it's crucial to have a clear and repeatable method for reproducing it. This section outlines the steps to replicate the issue, ensuring that developers and users can consistently observe the problem and test potential fixes. By following these steps, you can confirm whether you are encountering the same bug and contribute valuable information to the debugging process.

Steps to Reproduce

  1. Deploy ARM using Docker Compose:
    • Set up ARM using a Docker Compose configuration. This involves creating a docker-compose.yml file that defines the ARM service and its dependencies, such as databases and file storage.
    • Ensure that the Docker environment is correctly configured and that all necessary images are pulled and running.
    • While Docker Compose is not an officially supported method, it is a common deployment strategy, making it important to address issues that arise in this context.
  2. Enable the "Main Feature" setting in ARM:
    • Access the ARM configuration settings, typically through a web interface or configuration file.
    • Locate the "Main Feature" option and enable it. This setting instructs ARM to identify and rip only the primary movie content from a disc.
    • Save the changes to the configuration to ensure the setting is applied.
  3. Insert a Blu-ray disc into the drive:
    • Place a Blu-ray disc into the optical drive connected to the system running ARM.
    • Ensure that the disc is properly seated and recognized by the system.
    • The disc should contain a main movie feature that ARM can attempt to identify and rip.
  4. Monitor the ripping process and observe the failure:
    • Start the ARM ripping process, either automatically or manually.
    • Observe the logs and output messages for any errors or indications of failure.
    • The expected outcome is that the ripping process will fail before any significant data is read from the disc, accompanied by an error message similar to the one reported in the bug report.

Expected Outcome

When the bug is successfully reproduced, the ARM process will fail shortly after starting, displaying an error message in the logs. This error typically involves a TypeError related to the logging mechanism, specifically an unexpected keyword argument num. The ripping process will not proceed to read the main feature from the disc, and ARM will likely terminate or enter an error state.

By consistently reproducing this issue, developers can gain a deeper understanding of the underlying cause and work towards a reliable solution. This step-by-step guide ensures that the bug can be replicated across different environments and configurations, facilitating effective debugging and testing.

Analyzing the Error Logs: Deciphering the Root Cause

Error logs are invaluable resources for diagnosing software issues. In the case of the ARM "Main Feature" bug, the error logs provide critical clues about why the ripping process fails. By carefully examining the log output, we can pinpoint the exact location of the error, the type of exception raised, and the sequence of events leading up to the failure. This detailed analysis is essential for identifying the root cause of the problem and developing an effective fix.

Relevant Log Output

Here's the relevant log output from the bug report, which serves as the basis for our analysis:

[07-17-2025 09:01:59] DEBUG ARM: utils.put_track Track #00 Length: 5122 fps: 24.000 aspect: 16:9 Mainfeature: False Source: MakeMKV
[07-17-2025 09:01:59] DEBUG ARM: utils.database_adder Trying to add Track
[07-17-2025 09:01:59] DEBUG ARM: utils.database_adder successfully written Track to the database
[07-17-2025 09:01:59] INFO ARM: makemkv.makemkv_mkv Trying to find mainfeature
[07-17-2025 09:01:59] ERROR ARM: arm_ripper.rip_visual_media MakeMKV did not complete successfully.  Exiting ARM! Error: Logger._log() got an unexpected keyword argument 'num'
[07-17-2025 09:01:59] ERROR ARM: main.<module>
Traceback (most recent call last):
  File "/opt/arm/arm/ripper/arm_ripper.py", line 56, in rip_visual_media
    makemkv_out_path = makemkv.makemkv(job)
  File "/opt/arm/arm/ripper/makemkv.py", line 694, in makemkv
    makemkv_mkv(job, rawpath)
  File "/opt/arm/arm/ripper/makemkv.py", line 626, in makemkv_mkv
    rip_mainfeature(job, track, rawpath)
  File "/opt/arm/arm/ripper/makemkv.py", line 710, in rip_mainfeature
    logging.info("Processing track#{num} as mainfeature. Length is {seconds}s",
  File "/usr/lib/python3.10/logging/__init__.py", line 2138, in info
    root.info(msg, *args, **kwargs)
  File "/usr/lib/python3.10/logging/__init__.py", line 1477, in info
    self._log(INFO, msg, args, **kwargs)
TypeError: Logger._log() got an unexpected keyword argument 'num'

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/opt/arm/arm/ripper/main.py", line 225, in <module>
    main(log_file, job, args.protection)
  File "/opt/arm/arm/ripper/main.py", line 111, in main
    arm_ripper.rip_visual_media(have_dupes, job, logfile, protection)
  File "/opt/arm/arm/ripper/arm_ripper.py", line 60, in rip_visual_media
    raise ValueError from mkv_error
ValueError
[07-17-2025 09:01:59] ERROR ARM: main.<module> A fatal error has occurred and ARM is exiting.  See traceback below for details.

Key Observations

  1. TypeError: The primary error is a TypeError: Logger._log() got an unexpected keyword argument 'num'. This indicates that the logging function is being called with an argument it doesn't expect.
  2. Location: The error occurs in the rip_mainfeature function within makemkv.py, specifically at line 710: `logging.info(