M4: add ffmpeg-full install status to response
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@@ -1,5 +1,15 @@
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# M4 Response: FFmpeg DrawText 選型回饋
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## M4 已處理
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| 問題 | 狀態 |
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|------|------|
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| ffmpeg 無 `drawtext` | ✅ M4 已安裝 `ffmpeg-full`(`brew install ffmpeg-full`),link 覆蓋原 ffmpeg |
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| `drawtext` filter 可用 | ✅ 已確認 |
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| trace #2 (1 det) video | ✅ 200 OK (1MB) |
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| trace #5 (2 dets) video | ✅ 200 OK (1.9MB) |
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| trace #3128 (1109 dets) | ❌ 仍 500(ARG_MAX overflow,需等 M5 修 code) |
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## 核心遺漏:ARG_MAX overflow
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M5 的選型評估沒有解決 **真正導致 500 的原因** — `trace_video()` 為 trace #3128 (1109 detections) 產生的 filter_complex 字串超過 macOS 命令列長度限制 (~256KB)。
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