:: Introduction ::

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Goal of the application is to find duplicated audio files inside selected folders. Three different type of comparison strategies are used to achieve this goal: comparison of raw data inside audio files, comparison of music metadata tags inside mp3 and ogg files, and acoustical comparison of audio signal inside the first segments of mp3 files.

Highlights:

• Duplicates with bad or missing music-tags but same or similar sound will be detected by acoustical audio matcher.
• Audio matcher is well tuned and represents a good compromise between performance speed, memory consumption, audio sensitivity and matcher robustness.
• Audio matcher will detect duplicates even
  • if audio signals are shifted; started at different moments.
  • if audio signals are ripped by different bit rates.
  • if audio signals are ripped by different volumes.
• Program design of Phelix obliges to concurrent computing paradigm. This is done to get computing power from MultiCore CPU PC systems. User can control the level of concurrency.
• Performance: 4 audio executions per seconds on AMD Opteron 270 (DualCore) in 1 thread mode, or 7 audio executions per seconds in 2 threads mode (memory consumption: approximately 40MB of RAM for 1000 songs).
• Classical music-tags matcher supports MP3 and OGG formats. Music-tags matcher has a long tradition and is now improved to be even better.
• Matching can operate in incremental mode. In this mode, user can work on so-far collected duplicates while the matcher processes are in progress.
• Program automatically chooses which duplicates will be moved out and which one will be kept. Decision is ruled by 'keep-file-criteria'. Criteria is controlled by user and can include comparisons of: file type, file length, bit rate, song length, number of songs in folder and file creation time.
• User can manually overrule the program decisions.
• Program automatically detects distrusted groups of duplicates. Detection criteria is based on song length deviation and can be controlled by user.
• Distrusted groups of duplicates can be separated from trusted groups in extra table and can be auto-deselected to prevent the accidental removal.
• Files are never deleted by this tool, they are removed to the  destination directory.
• Undo remove operation is supported (if removed files are not deleted by user).
• Achieved knowledge about the scanned music can be persistently saved in Phelix's library repository. Stored information will be retrieved from repository when needed to skip the re-execution of jobs that have already been executed in previous runs of application.
• Wizards and contextual menu (right-click) are supported to ease the application usage.