camera 即時推論開不了根因:vendor decoder-only ffmpeg --disable-everything 沒 enable 任何 input device → macOS avfoundation 認不得。 - WP-1 macOS:ffmpeg rebuild 加 --enable-avfoundation + --enable-indev=avfoundation (--disable-autodetect 會靜默 disable、兩行要一起帶)。-list_devices 列出相機、 +22KB、LGPL-safe。sha 已核對。 - WP-2:buildCaptureArgs 補 Linux v4l2 分支(原誤落 avfoundation default 必壞)+ ListFFmpegDevices Linux glob /dev/video*。四路明確 case + 回歸鎖。 reviewer WP-1(0C/0M/0m) + WP-2(0C/0M/2m) 通過。Windows dshow / Linux v4l2 實機驗待機器。 Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
349 lines
14 KiB
Markdown
349 lines
14 KiB
Markdown
# macOS LGPL ffmpeg build record
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此目錄存放 visionA-local 的 macOS x86_64 專用 ffmpeg + ffprobe binary。
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依 v2 TDD §2(`/.autoflow/04-architecture/v2/ffmpeg-lgpl.md`)決策,macOS 沒有現成的
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LGPL static build 來源,採「自 build decoder-only」策略,binary 直接 commit 到 git
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(R5-6b)— 開發者 clone repo 即可使用,不必每次重 build(~15 分鐘)。
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---
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## Reproducibility
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| 項目 | 值 |
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|------|---|
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| ffmpeg release | `n7.1` |
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| Source tarball | <https://github.com/FFmpeg/FFmpeg/archive/refs/tags/n7.1.tar.gz> |
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| Source sha256 | `7ddad2d992bd250a6c56053c26029f7e728bebf0f37f80cf3f8a0e6ec706431a` |
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| Build host | macOS 14.7.6 (Sonoma, x86_64) |
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| Toolchain | Apple clang 16.0.0 (clang-1600.0.26.6), Command Line Tools |
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| Assembler | nasm 3.01(Homebrew bottle,compiled 2025-10-11) |
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| Homebrew | 5.1.6 |
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| Build date | 2026-08-02(ADR-020 rebuild:加回 avfoundation indev) |
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| Build flags | 見下方 Configure flags 區塊(與 `Makefile` 的 `vendor-ffmpeg-macos-build` target 一致) |
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> **ADR-020 變更(2026-08-02)**:configure 加 `--enable-avfoundation` + `--enable-indev=avfoundation`,
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> 讓 camera 即時推論可用 avfoundation 抓實體攝影機。詳見
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> `docs/autoflow/04-architecture/adr/adr-020-ffmpeg-camera-indev.md`。
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> 之前的 decoder-only build(2026-04-15)沒編任何 indev,導致 `Unknown input format: 'avfoundation'`、camera 開不了。
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## Binary sha256
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| 檔案 | sha256 |
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|------|--------|
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| `ffmpeg` | `1afa56dabb4ba4fb45323e37510602309ffd544d9e7ecb2d8267697a7cc16626` |
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| `ffprobe` | `501ec3fbe450c44f4c28cd7534940c6a16a42f8584e852b4f315de565aba414e` |
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| `COPYING.LGPLv3` | `da7eabb7bafdf7d3ae5e9f223aa5bdc1eece45ac569dc21b3b037520b4464768` |
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> 舊值(2026-04-15 decoder-only、無 indev):ffmpeg `c3cb9f1d…992c` / ffprobe `bd388fb4…0c5e`。
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計算指令:
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```bash
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shasum -a 256 vendor/ffmpeg/macos/ffmpeg vendor/ffmpeg/macos/ffprobe
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```
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## Binary 大小(實測,strip 後)
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| 檔案 | Bytes | 人類可讀 |
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|------|-------|---------|
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| `ffmpeg` | 6,030,224 | 5.8 MB |
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| `ffprobe` | 5,892,384 | 5.6 MB |
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實測比 TDD 原估 10–15 MB 小一半,因為 `--disable-everything` + 白名單僅啟用必要 decoder/demuxer/filter,無 GPL 元件。
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> **avfoundation indev 體積增量(ADR-020)**:ffmpeg 6,007,520 → 6,030,224 bytes,僅
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> **+22,704 bytes(+0.02 MB)**,遠低於 ADR-020 估的 < 0.5 MB。因 avfoundation indev 是薄封裝,
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> 呼叫系統 AVFoundation / CoreMedia / CoreVideo framework,不自帶任何 codec。
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### Build 實測耗時
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- **3 分 57 秒**(2026-08-02 ADR-020 rebuild,`make vendor-ffmpeg-macos-build` 的 `time` 量測)
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- user: 870.32s,system: 92.27s,wall-clock: 236.62s
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- CPU 使用率:~406%(macOS x86_64,8 核 Intel)
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- (2026-04-15 首次 decoder-only build 為 2 分 44 秒;本次略增因多編 avfoundation indev)
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## License
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**LGPL v3**(`--enable-version3` 未加 `--enable-gpl`)。完整授權條款見同目錄的
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`COPYING.LGPLv3`(build 後由 Makefile 自動從 source tarball 複製過來)。
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build 不 link 以下 GPL-only 元件:
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- 無 `libx264`(H.264 encoder,GPL)
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- 無 `libx265`(H.265 encoder,GPL)
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- 無 `libxavs` / `libxvid`(GPL)
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- 無 `libfaac`(non-free)
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僅使用 libavcodec 內建的 LGPL native decoder(h264 / hevc / mpeg1video / mpeg2video /
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mpeg4 / mjpeg / prores / vp8 / vp9 / aac / mp2 / mp3 / pcm_*)。
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**avfoundation indev(ADR-020)為 LGPL-safe,不引入任何 GPL 元件**:avfoundation input device
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只是薄封裝、透過 macOS 系統的 AVFoundation / CoreMedia / CoreVideo framework 抓實體攝影機 frame,
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不含任何第三方 / GPL codec。加 `--enable-avfoundation` + `--enable-indev=avfoundation` 後,
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`ffmpeg -version` 的 configuration line 仍**不含** `--enable-gpl` / `libx264` / `libx265`(已實測驗證),
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`--enable-version3`(LGPL v3)合規未破。新增 link 的皆為 Apple 系統 framework(AVFoundation /
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Foundation / CoreGraphics / libobjc),非第三方 dylib。
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---
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## Configure flags(完整複製)
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```
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./configure \
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--prefix="<build_dir>/install" \
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--enable-version3 \
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--disable-debug \
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--disable-doc \
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--disable-ffplay \
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--disable-network \
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--disable-autodetect \
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--disable-shared \
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--enable-static \
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--disable-everything \
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--enable-small \
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--enable-protocol=file,pipe \
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--enable-avfoundation \
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--enable-indev=avfoundation \
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--enable-demuxer=mov,avi,mpegps,mpegts,matroska,image2 \
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--enable-decoder=h264,hevc,mpeg1video,mpeg2video,mpeg4,mjpeg,prores,vp8,vp9,aac,mp2,mp3,pcm_s16le,pcm_s16be \
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--enable-parser=h264,hevc,mpeg4video,mpegaudio,aac \
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--enable-filter=scale,format,fps,null,anull \
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--enable-muxer=image2pipe,image2,null \
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--enable-encoder=mjpeg \
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--enable-swscale \
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--enable-swresample \
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--extra-cflags="-arch x86_64 -mmacosx-version-min=10.15" \
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--extra-ldflags="-arch x86_64 -mmacosx-version-min=10.15 -Wl,-search_paths_first" \
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--arch=x86_64 \
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--target-os=darwin \
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--cc="clang -arch x86_64"
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```
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### 為什麼是這些 flag
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| flag | 理由 |
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|------|-----|
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| `--enable-version3` | 使用 LGPL v3(非 v2.1),與 BtbN Windows/Linux build 對齊 |
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| `--disable-debug` / `--disable-doc` | 縮 binary 體積 |
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| `--disable-network` | 我們只處理本地檔案,不需要 http/rtsp/rtmp 協議 |
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| `--disable-autodetect` | 不自動偵測系統上的外部 lib(`libopus` / `libvpx` 等),LGPL 合規稽核時更乾淨 |
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| `--disable-shared --enable-static` | 產出 self-contained binary,不依賴 macOS 上任何外部 dylib |
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| `--disable-everything` | 先關全部,白名單 enable,確保不額外 link 任何 GPL 元件 |
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| `--enable-small` | 最佳化體積而非速度 |
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| `--enable-protocol=file,pipe` | 只開 file:// 和 pipe(ffmpeg 內部 stdin/stdout) |
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| `--enable-avfoundation` | **(ADR-020)** camera 抓實體攝影機需 AVFoundation framework。因本 build 用 `--disable-autodetect`(連 AVFoundation 框架都不自動偵測),必須顯式 `--enable-avfoundation` 才能讓下面的 `avfoundation` indev 的依賴(`avfoundation corevideo coremedia pthreads`)被滿足。**少了這行、`--enable-indev=avfoundation` 會被 configure 靜默 disable(`WARNING: Disabled avfoundation_indev because not all dependencies are satisfied`)** |
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| `--enable-indev=avfoundation` | **(ADR-020)** camera 即時推論的 macOS input device。ffmpeg `-f avfoundation -i "<index>:none"` 從實體攝影機抓 raw frame → MJPEG pipe。少了它會 `Unknown input format: 'avfoundation'`。LGPL-safe 薄封裝、體積增量 < 0.03MB |
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| `--enable-demuxer=mov,avi,mpegps,mpegts,matroska,image2` | 對齊 PRD v2 支援的上傳格式 `.mp4 / .avi / .mov / .mpeg / .mpg` |
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| `--enable-decoder=h264,hevc,...` | 涵蓋常見 codec:H.264 / H.265 / MPEG1/2/4 / mjpeg / prores / vp8/9 / AAC / MP2/3 / PCM |
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| `--enable-parser=...` | 必要,否則某些 decoder 會在碼流切分階段 fail |
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| `--enable-muxer=image2pipe,image2,null` | 輸出單張 JPEG 或 NULL(測試用) |
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| `--enable-encoder=mjpeg` | `-f image2pipe -vcodec mjpeg` 需要 mjpeg encoder(LGPL-safe) |
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| `--enable-swscale` / `--enable-swresample` | pixel format / sample rate 轉換 |
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| `-mmacosx-version-min=10.15` | 相容 macOS 10.15 Catalina 以上 |
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---
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## How to rebuild
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**僅在升級 ffmpeg 版本時才需要執行。平常 clone repo 後直接使用 git 內的 binary。**
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### 前置系統依賴
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```bash
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brew install pkg-config nasm # 或 yasm(擇一)
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```
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### 執行 build
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```bash
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cd /path/to/local-tool
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make vendor-ffmpeg-macos-build
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```
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target 會:
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1. 從 GitHub 下載 ffmpeg source tarball(版本由 `Makefile` 的 `FFMPEG_VERSION` 變數控制)
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2. 驗證 sha256(不符則 fail)
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3. 解壓到 `build/ffmpeg-macos/src/`
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4. `./configure`(只啟用 decoder/demuxer/filter 白名單,不 link 任何 GPL 元件)
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5. `make -j$(sysctl -n hw.ncpu)`
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6. `make install` 到 `build/ffmpeg-macos/install/`
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7. 複製 `ffmpeg` + `ffprobe` 到 `vendor/ffmpeg/macos/`
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8. `strip -S -x`(去除 debug symbol 與 local symbol)
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9. ad-hoc `codesign`(無 Apple Developer ID 也能在 Gatekeeper 下跑)
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10. 驗證 `ffmpeg -version` 不含 `--enable-gpl` / `libx264` / `libx265`
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11. 複製 `COPYING.LGPLv3` 到同目錄
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Build 完成後,請手動更新本檔的「Build date / Binary sha256 / Binary 大小 / Build 實測耗時」
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區塊,然後:
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```bash
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git add vendor/ffmpeg/macos/ffmpeg \
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vendor/ffmpeg/macos/ffprobe \
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vendor/ffmpeg/macos/COPYING.LGPLv3 \
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vendor/ffmpeg/macos/BUILD.md
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git commit -m "chore(vendor): rebuild macOS ffmpeg LGPL binary (n<version>)"
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```
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**注意**:不要 commit `build/` 目錄下的中間產物(已在 `.gitignore`)。
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---
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## Verification
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Build 完成後的自動驗證:
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```bash
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# 1. 確認 LGPL 合規(不含 GPL 元件)
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vendor/ffmpeg/macos/ffmpeg -version 2>&1 | grep -E -- '--enable-gpl|libx264|libx265'
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# 預期:無輸出
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# 2. 確認可執行
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vendor/ffmpeg/macos/ffmpeg -version | head -3
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vendor/ffmpeg/macos/ffprobe -version | head -3
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# 3. 確認 decoder 完整
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vendor/ffmpeg/macos/ffmpeg -hide_banner -decoders 2>/dev/null | grep -E ' (h264|hevc|aac|mpeg2video|mpeg4|mjpeg|prores|vp8|vp9|mp3) '
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# 4. 確認 demuxer 完整
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vendor/ffmpeg/macos/ffmpeg -hide_banner -formats 2>/dev/null | grep -E ' (mov|avi|mpeg|matroska)'
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# 5. 確認 Gatekeeper 可過(ad-hoc signed)
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codesign -v vendor/ffmpeg/macos/ffmpeg
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codesign -v vendor/ffmpeg/macos/ffprobe
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# 預期:無輸出(exit 0)
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# 6. 實際解一支 mp4 影片
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vendor/ffmpeg/macos/ffmpeg -hide_banner -i <some-sample>.mp4 -f image2pipe -vcodec mjpeg -frames:v 1 -q:v 5 /tmp/test.jpg
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file /tmp/test.jpg
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# 預期:JPEG image data
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# 7.(ADR-020)確認 avfoundation indev 有編進去、可列出攝影機
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vendor/ffmpeg/macos/ffmpeg -hide_banner -devices 2>&1 | grep avfoundation
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# 預期:D avfoundation
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vendor/ffmpeg/macos/ffmpeg -hide_banner -f avfoundation -list_devices true -i "" 2>&1
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# 預期:列出 AVFoundation video/audio devices(不再 Unknown input format: 'avfoundation')
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# 註:-list_devices true 列完裝置後會以非 0 退出(Error opening input),屬正常,非失敗。
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```
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---
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## 實測驗證輸出(本次 build)
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### 1. LGPL 合規(ffmpeg -version 擷取)
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```
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ffmpeg version a6b71ea Copyright (c) 2000-2024 the FFmpeg developers
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built with Apple clang version 16.0.0 (clang-1600.0.26.6)
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configuration: --prefix=.../install --enable-version3 --disable-debug --disable-doc
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--disable-ffplay --disable-network --disable-autodetect --disable-shared --enable-static
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--disable-everything --enable-small --enable-protocol=file,pipe
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--enable-demuxer=mov,avi,mpegps,mpegts,matroska,image2
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--enable-decoder=h264,hevc,mpeg1video,mpeg2video,mpeg4,mjpeg,prores,vp8,vp9,aac,mp2,mp3,pcm_s16le,pcm_s16be
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--enable-parser=h264,hevc,mpeg4video,mpegaudio,aac
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--enable-filter=scale,format,fps,null,anull
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--enable-muxer=image2pipe,image2,null --enable-encoder=mjpeg
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--enable-swscale --enable-swresample ...
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libavutil 59. 39.100 / 59. 39.100
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libavcodec 61. 19.100 / 61. 19.100
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libavformat 61. 7.100 / 61. 7.100
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```
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- ✅ 無 `--enable-gpl`
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- ✅ 無 `libx264`
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- ✅ 無 `libx265`
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- ✅ 有 `--enable-version3`(LGPL v3)
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### 2. Decoder 驗證
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```
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$ vendor/ffmpeg/macos/ffmpeg -hide_banner -decoders 2>&1 \
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| grep -E ' h264 | hevc | aac | mpeg2video | mpeg4 '
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VFS..D h264
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VFS..D hevc
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V.S.BD mpeg2video
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VF..BD mpeg4
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A....D aac
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```
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五個必要 decoder 全數通過。
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### 3. Demuxer / Format 驗證
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```
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$ vendor/ffmpeg/macos/ffmpeg -hide_banner -formats 2>&1 \
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| grep -iE 'mov|mp4|avi|mpeg|matroska'
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D avi
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D matroska,webm
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D mov,mp4,m4a,3gp,3g2,mj2
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D mpeg
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D mpegts
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```
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- `mov,mp4,m4a,3gp,3g2,mj2` — 涵蓋 mp4 / mov
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- `avi` — ok
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- `mpeg` — 對應 mpegps(MPEG Program Stream)
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- `mpegts` — MPEG Transport Stream
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- `matroska,webm` — ok
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### 4. Dynamic dependencies (`otool -L`)(ADR-020 rebuild 後)
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```
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vendor/ffmpeg/macos/ffmpeg:
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/System/Library/Frameworks/Foundation.framework/.../Foundation ← ADR-020 新增(avfoundation 依賴)
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/usr/lib/libSystem.B.dylib
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/System/Library/Frameworks/AVFoundation.framework/.../AVFoundation ← ADR-020 新增
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/System/Library/Frameworks/CoreVideo.framework/.../CoreVideo
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/System/Library/Frameworks/CoreMedia.framework/.../CoreMedia
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/System/Library/Frameworks/CoreGraphics.framework/.../CoreGraphics ← ADR-020 新增(avfoundation suggest)
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/System/Library/Frameworks/CoreFoundation.framework/.../CoreFoundation
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/usr/lib/libobjc.A.dylib ← ADR-020 新增(Objective-C runtime)
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vendor/ffmpeg/macos/ffprobe:
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(同上一組 macOS system framework)
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```
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- ✅ 只依賴 macOS 系統內建 framework / dylib(AVFoundation / Foundation / CoreVideo / CoreMedia /
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CoreGraphics / CoreFoundation / libSystem / libobjc)
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- ✅ **無任何第三方 dylib**(`libx264`, `libx265`, `libvpx`, `libopus`... 都不存在)
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- ✅ 新增的皆為 Apple 第一方系統 framework,**LGPL 合規未破**,仍是 self-contained binary,搬到任一台
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macOS 10.15+ x86_64 都能跑
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### 5. Code signing
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```
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$ codesign -v vendor/ffmpeg/macos/ffmpeg # exit 0, no output
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$ codesign -v vendor/ffmpeg/macos/ffprobe # exit 0, no output
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```
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ad-hoc symbol signing ok,Gatekeeper 可過。
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### 6. avfoundation indev(ADR-020,本次 rebuild 新增)
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```
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$ vendor/ffmpeg/macos/ffmpeg -hide_banner -devices 2>&1 | grep avfoundation
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D avfoundation
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$ vendor/ffmpeg/macos/ffmpeg -hide_banner -f avfoundation -list_devices true -i ""
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[AVFoundation indev @ ...] AVFoundation video devices:
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[AVFoundation indev @ ...] [0] FaceTime HD相機(內建)
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[AVFoundation indev @ ...] [1] Capture screen 0
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[AVFoundation indev @ ...] AVFoundation audio devices:
|
||
[AVFoundation indev @ ...] [0] MacBook Pro的麥克風
|
||
```
|
||
|
||
- ✅ `-devices` 列出 `avfoundation`(demuxing supported)
|
||
- ✅ `-list_devices true` 成功列出實體攝影機(FaceTime HD 相機)+ 音訊裝置
|
||
- ✅ 不再出現 `Unknown input format: 'avfoundation'`(camera 開不了的根因已解)
|
||
- 註:`-list_devices true` 列完裝置後以非 0 退出(`Error opening input`)屬正常行為,非失敗。
|
||
|
||
---
|
||
|
||
## Commit 清單(只允許這四個檔進 git)
|
||
|
||
為了防呆,`.gitignore` 設定成「`vendor/ffmpeg/macos/**` 全部 un-ignore」,
|
||
因此任何意外丟進此目錄的檔案都會被 git 看見。code review 時請嚴格檢查
|
||
這個目錄下**只有**以下四個檔:
|
||
|
||
- `ffmpeg`(binary)
|
||
- `ffprobe`(binary)
|
||
- `COPYING.LGPLv3`(授權條款)
|
||
- `BUILD.md`(本檔)
|