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06_Detection_Logic
dnzbk edited this page Jul 9, 2025
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1 revision
Understanding how RemoveSamples identifies and processes sample files and directories.
RemoveSamples uses a multi-layered detection system that combines pattern matching, size analysis, and file type recognition to accurately identify sample content while preserving legitimate media files.
File/Directory Found
↓
Directory Check
↓ (if directory)
Directory Pattern Match → Remove if match
↓ (if file)
File Extension Check
↓
Pattern Match Check
↓
Size Threshold Check
↓
Final Decision: Remove or Preserve
RemoveSamples uses regex patterns to identify sample directories:
directory_patterns = [
r'\bsamples?\b', # "sample" or "samples" as whole words
r'^samples?$', # Exact match "sample" or "samples"
r'sample[_\-\s]', # "sample" followed by separator
r'[_\-\s]samples?$', # "sample(s)" at end after separator
]Will be removed:
samples/
SAMPLES/
Sample_Videos/
Movie_Samples/
preview-samples/
Sample Videos/
SAMPLE/
Will be preserved:
Bonus_Features/ # No sample pattern
Behind_The_Scenes/ # Different content type
Extras/ # Generic extras folder
Movie.Name.Sample.Title/# "Sample" part of title
- Recursive scanning - Checks all subdirectories
- Pattern matching - Tests directory name against patterns
- Complete removal - Deletes directory and all contents
- Safety checks - Verifies write permissions before deletion
file_patterns = [
r'\bsample\b', # Word boundary "sample"
r'\.sample\.', # ".sample." in filename
r'_sample\.', # "_sample." pattern
r'-sample\.', # "-sample." pattern
r'^sample\.', # Starts with "sample."
r'sample[_\-]', # "sample" + separator
]✅ Detected (will be removed):
movie.sample.mkv # .sample. pattern
sample.mp4 # Starts with sample
preview_sample.avi # _sample. pattern
trailer-sample.wmv # -sample. pattern
sample_clip.mov # sample + separator
Sample.Preview.mkv # Case insensitive
❌ Not detected by pattern:
movie.resample.mkv # "resample" not "sample"
sampling_rate.wav # "sampling" not "sample"
example.mkv # Different word entirely
Movie.Sample.Title.mkv # May need size check
# Default thresholds (configurable)
video_threshold = 150 # MB
video_extensions = ['.mkv', '.mp4', '.avi', '.mov', '.wmv',
'.flv', '.webm', '.m4v', '.3gp', '.ts',
'.mpg', '.mpeg', '.vob', '.iso']# Default thresholds (configurable)
audio_threshold = 2 # MB
audio_extensions = ['.mp3', '.flac', '.aac', '.ogg', '.wma',
'.m4a', '.opus', '.wav']- Check file extension against video/audio lists
- Get file size in megabytes
- Compare against threshold for file type
- Combine with pattern results for final decision
| Pattern Match | Size Check | Result |
|---|---|---|
| ✅ Yes | ✅ Below threshold | REMOVE |
| ✅ Yes | ❌ Above threshold | REMOVE (pattern overrides) |
| ❌ No | ✅ Below threshold | PRESERVE (size alone insufficient) |
| ❌ No | ❌ Above threshold | PRESERVE |
# Pattern match always wins
if pattern_matches(filename):
return REMOVE # Regardless of size
# Size-only detection requires pattern absence
if not pattern_matches(filename) and below_threshold(filesize):
return PRESERVE # Pattern required for removal| Resolution | Typical Sample Size | Recommended Threshold |
|---|---|---|
| 480p | 15-30 MB | 50 MB |
| 720p | 30-60 MB | 100 MB |
| 1080p | 50-150 MB | 150 MB (default) |
| 1440p | 100-250 MB | 300 MB |
| 2160p (4K) | 150-500 MB | 500 MB |
# High compression formats (smaller samples)
high_compression = ['.mp4', '.mkv', '.webm']
# Lower compression formats (larger samples)
lower_compression = ['.avi', '.mov', '.wmv']
# Archive formats (special handling)
archive_formats = ['.iso', '.vob']- High bitrate (50+ Mbps): Samples can be 200-400 MB
- Medium bitrate (10-30 Mbps): Samples typically 50-150 MB
- Low bitrate (<10 Mbps): Samples usually under 50 MB
| Format | Quality | 30 seconds | 1 minute | Threshold |
|---|---|---|---|---|
| MP3 | 128 kbps | 0.5 MB | 1 MB | 2 MB |
| MP3 | 320 kbps | 1.2 MB | 2.4 MB | 2 MB |
| FLAC | Lossless | 3-5 MB | 6-10 MB | 5-10 MB |
| AAC | 256 kbps | 1 MB | 2 MB | 2 MB |
Common audio sample names:
01_sample.mp3 # Track number + sample
preview.mp3 # Preview without "sample"
30sec_sample.flac # Duration + sample
album_sample.aac # Album sample
sample_track.wav # Sample + track
# Prevents false positives
pattern = r'\bsample\b'
# Matches: "movie.sample.mkv"
# Ignores: "movie.resample.mkv"
# Ignores: "movie.sampling.mkv"# All patterns use re.IGNORECASE flag
re.search(pattern, filename, re.IGNORECASE)
# Matches: sample, SAMPLE, Sample, SaMpLeseparators = ['.', '_', '-', ' ']
# Handles: .sample. _sample. -sample. sample# Supports international characters in filenames
filename.lower() # Handles Unicode case conversionTechniques used:
- Word boundary matching prevents substring matches
- Extension validation ensures appropriate file types
- Size thresholds prevent removal of full content
- Pattern specificity targets actual sample patterns
Common missed samples:
- Files with non-standard patterns (preview.mkv)
- Very large samples (above threshold)
- Unusual file extensions
- Obfuscated sample names
Based on testing with common sample types:
- Pattern detection: 95% accuracy
- Size detection: 90% accuracy
- Combined detection: 97% accuracy
- False positive rate: <1%
Settings → Extension Manager → RemoveSamples → Debug: Yes
[DEBUG] Checking file: movie.sample.mkv
[DEBUG] Extension check: .mkv is video file
[DEBUG] Pattern check: 'sample' found with word boundary
[DEBUG] Size check: 45MB < 150MB threshold
[DEBUG] Decision: REMOVE (pattern match + below threshold)
[INFO] Removing sample file: movie.sample.mkv
[DEBUG] Checking directory: samples/
[DEBUG] Directory pattern check: 'samples' matches pattern
[DEBUG] Decision: REMOVE (directory pattern match)
[INFO] Removing sample directory: samples/ (3 files)
File preserved unexpectedly:
[DEBUG] Pattern check: no sample pattern found
[DEBUG] Size check: 45MB < 150MB threshold
[DEBUG] Decision: PRESERVE (no pattern, size alone insufficient)
File removed unexpectedly:
[DEBUG] Pattern check: 'sample' found in filename
[DEBUG] Size check: 250MB > 150MB threshold
[DEBUG] Decision: REMOVE (pattern match overrides size)
Higher thresholds (300MB video, 10MB audio):
- More aggressive size-based detection
- May catch larger samples
- Risk of false positives increases
Lower thresholds (50MB video, 1MB audio):
- More conservative size-based detection
- May miss smaller samples
- Safer for valuable content
Adding extensions:
- Enables detection for new file types
- Useful for rare formats
Removing extensions:
- Disables detection for specific types
- Useful if format has no samples
4K/High Quality Content:
Video Size Threshold: 500 MB
Audio Size Threshold: 10 MB
Standard Definition Content:
Video Size Threshold: 100 MB
Audio Size Threshold: 1 MB
Music-Only Libraries:
Video Size Threshold: 150 MB (unchanged)
Audio Size Threshold: 1 MB (more aggressive)
- Pattern matching: Very fast (regex optimized)
- Size checking: Fast (single file stat call)
- Directory scanning: Scales with file count
- Overall impact: Minimal (<1% of processing time)
Need configuration help? → Configuration Reference
Having detection issues? → Troubleshooting Guide