Bug: 'Vključi pre-chorus' checkbox in UI was sent to backend but ignored
by Claude/Gemini analysis prompt. Both modes used same lenient rules
saying 'pre-chorus is optional' — Claude often included pre-chorus even
when user wanted just chorus.
Real-world failure: Lady Gaga 'Abracadabra' picked 54.7-84.6s, but actual
chorus 'Abracadabra, amor, ooh-na-na' starts at 85.2s. Claude included
the entire pre-chorus block ('Hold me in your heart tonight', 'Like a
poem said by a lady in red', 'With a haunting dance') and missed the
actual chorus completely.
Fix: include_prebuild parameter now flows all the way to the prompt:
- main.py → analyze.py CLI args → analyze_with_llm() → prompt builder
- Two distinct prompt rule sets:
CHORUS ONLY (default, include_prebuild=False):
- Strict: 'clip starts on FIRST WORD of chorus, never before'
- Length: 12-25s typically
- Explicit examples for pop songs (Abracadabra, Despacito, Shape of You)
- List of common mistakes to avoid
CHORUS + PRE-CHORUS (include_prebuild=True):
- Optional pre-chorus before chorus, 4-10s
- Length: 18-35s
This fixes the most common failure mode where Claude rationalizes
including verse/pre-chorus content even when user explicitly wants
just the chorus.
Sebastjan Artič
a30137f1f2