35 lines
2.1 KiB
Markdown
35 lines
2.1 KiB
Markdown
# vibevoice-asr-seat
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**Microsoft VibeVoice-ASR-Streaming-1.5B** (**Q8_0** since 2026-09-26; was Q4_K) on **nh3-ml1**, served by
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**audio.cpp** (`0xShug0/audio.cpp` v0.8.2-audio8-perf-hotfix, Linux CUDA 12.8
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build) on `:8031`, with direct access only. A utility seat for brokkr's dataset
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foundry (speech → text with inline speaker labels). Operator-approved 2026-09-26,
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relayed by brokkr-smithy-dev.
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- `POST /v1/audio/transcriptions`: multipart `file=@x.wav`, `model=vibevoice-asr-streaming-1.5b`.
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Returns `{"text": " \n Speaker 0:...", "timing": {"rtf": ...}}`.
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- `POST /v1/audio/transcriptions/live?model=…&sample_rate=16000&channels=1&sample_format=s16le`
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takes chunked raw PCM.
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- `GET /v1/models`, `GET /health`.
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**Why audio.cpp and not vibevoice.cpp or llama.cpp.** The
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`christopherthompson81/VibeVoice-ASR-Streaming-1.5B-GGUF` files are audio.cpp
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packages with their sidecars embedded, per the model card, so no separate
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tokenizer is needed. The release binary expects the CUDA 12 runtime libraries,
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so `Dockerfile` puts it on `nvidia/cuda:12.8.1-runtime` with a SHA-256-pinned
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download, plus `libgomp1` and **`libsoxr0`**. Without libsoxr it falls back to
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linear resampling (16k→24k), and on one clip that turned "cutter" into "country".
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**Checks, 2026-09-26.** On the 4 LibriSpeech clips shipped with audio.cpp, WER
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is 3/69 = 4.35%, identical across 3 reps. Two of the three errors are "I'm" vs
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"I am" normalization. RTF is 0.07–0.14. ⚠ **The first request after a start
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takes ~31 s** (CUDA graph warmup); later ones take 0.3–1 s. VRAM ~2.0 GB.
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**Switched to Q8_0 (Prime, 2026-09-26 1616).** It is the card's recommended
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package: 3.3 GB on disk, ~1.1 GB more VRAM. On the same 4 clips, WER went from
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3/69 to **2/69 = 2.90%**, identical over 3 reps. The remaining 2 are the
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"I'm"/"I am" normalization artifact, so no real errors are left; Q4_K's
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"forwarded→folded" is gone. RTF is 0.09–0.17 (Q4_K was 0.07–0.14). This is 69
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words, so it separates working from broken, not a fine ranking. The Q4_K file was
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removed. To roll back, download it again and point `conf/server.json` at it.
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