voice_audio_multi/docs/models/qwen3_forced_aligner.md

Qwen3 Forced Aligner

For shared conversion guidance, see Qwen3 GGUF checkpoints.

The forced aligner maps an exact transcript onto speech audio. It is not an ASR route: the transcript is required input. Standalone forced alignment does not chunk audio because exact transcript/audio chunk pairing cannot be inferred safely from a raw transcript. For long-audio timestamping, use Qwen3 ASR with --words-out and qwen3_asr.forced_aligner_path; ASR chunks the audio first, then aligns each recognized transcript to its matching audio chunk.

Field	Value
Family	qwen3_forced_aligner
GGUF model	models/Qwen3-ForcedAligner-0.6B-GGUF/qwen3-forced-aligner-0.6b-q8_0.gguf
Task	align
Modes	offline
Input	Speech WAV plus exact transcript
Output	Word timestamp JSON through --words-out

audiocpp_cli --task align --family qwen3_forced_aligner --model models/Qwen3-ForcedAligner-0.6B-GGUF/qwen3-forced-aligner-0.6b-q8_0.gguf --backend cuda --audio assets/resources/sample_16k.wav --text "Some call me nature, others call me Mother Nature." --language English --words-out words.json

Common Options (use directly)

Option	Values	Default	Meaning
--audio	WAV path	required	Speech audio at any sample rate; timestamps are reported in that file's sample domain.
--text	exact transcript	required	Transcript to align.
--language	language code	required	Transcript language.
--audio-chunk-mode	auto, none	auto	Standalone forced alignment runs one audio/transcript pair. fixed and vad are rejected because transcript chunk boundaries would be ambiguous.
--words-out	JSON path	not set	Word timestamp output.

Request Options (use with --request-option)

Option	Values	Default	Meaning
clamp_timestamps_to_audio	bool	false	Opt-in guard for word timestamps: keep repaired spans inside the local audio input. Default preserves existing timestamp repair behavior.

Session Options (use with --session-option)

Option	Values	Default	Meaning
qwen3_forced_aligner.weight_type	native, f32, f16, bf16, q8_0	native	Aligner thinker weight type.