## /setup/preflight endpoint (backend/api/routers/setup.py)
New one-shot health check the setup wizard calls before model install.
Probes every runtime requirement so GPU driver mismatches, missing
ffprobe, low RAM, stale AMD ROCm setups, and unreachable HF no longer
manifest as silent CPU fallbacks or opaque runtime errors.
Checks returned as {id, label, status, detail, fix?}:
- Operating system + arch
- Python runtime
- System RAM (fail <8 GB, warn <12 GB)
- Disk free on HF cache partition (fail <10 GB)
- HuggingFace cache writable
- FFmpeg (required)
- FFprobe (warn — some endpoints degrade without it)
- GPU acceleration — vendor-aware detection:
* Apple Silicon → MPS available?
* NVIDIA → nvidia-smi parse; fail if driver < R555
(cu128 wheels we ship need ≥ 555)
* AMD → rocm-smi detect; warn if torch not built w/ ROCm
* none/unknown → warn, CPU-only note
- Network reachability to huggingface.co:443
Aggregate: {ok, has_warnings, checks, device}. Wizard blocks forward-
nav on any fail; passes warnings through with a labelled Continue.
## SetupWizard 4-step flow (frontend/src/pages/SetupWizard.jsx)
Insert "System check" as step 1 between Welcome and Install models.
Renders preflight report with pass/warn/fail icons, inline fix
instructions, and a Re-check button for users who resolve a blocker
without restarting the app. Continue button labels shift based on
status ("All good — continue" / "Continue (with warnings)" /
"Resolve blockers to continue").
## Transcribe-stream error clarity
dub_core.py: move ASR / missing-audio preflight out of HTTP-status
error paths into in-stream `error` events, since EventSource on the
client can't read non-2xx bodies and previously surfaced 503s as
opaque "network error" strings. Users now see the actionable message
(e.g. "ASR isn't loaded yet — check Settings → Models") inline.
App.jsx: on transcribe-stream drop before any final segment, force-
close + reject with a pointed message instead of waiting for
EventSource auto-reconnect to thrash against a broken endpoint.
## API client (frontend/src/api/setup.ts)
Add PreflightReport / PreflightCheck / PreflightDevice types + preflight()
call matching the new endpoint.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
