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| Pitfall | Typical Symptom | SCOP‑855‑ENGSUB Fix | |---------|----------------|--------------------| | | ASR mis‑recognises words, leading to garbled captions | Audio‑preprocessor applies spectral subtraction and adaptive noise gating | | Fast‑talking speakers | Missed words, large timing gaps | Chunk size drops to 15 s automatically when speech rate > 180 wpm | | Non‑standard terminology (e.g., “CRISPR‑Cas9”) | Words become “crispr c a s nine” | Custom domain lexicon can be dropped into lexicon/ (plain‑text) | | Long pauses | Subtitles linger on screen for seconds | Timing optimiser merges silence‑only chunks out of the final track | | Inconsistent speaker labels | “Speaker 1” swaps mid‑conversation | Diarisation model is re‑trained weekly on new client data to stay sharp |
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If your video contains multiple audio tracks (e.g., a presenter’s mic plus a room mic), pass --audio-select 1 to force the cleaner channel.