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            "content": "使用 ffmpeg 把视频 (0, 65) 到 (1173, 769) 的位置截取出来，视频的格式是 mov，我希望导出为 mp4",
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            "content": "你可以使用 `ffmpeg` 的 `crop` 滤镜来截取视频的指定区域，并将 `.mov` 转换为 `.mp4` 格式。以下是具体的命令：\n\n### 命令解析：\n1. **输入文件**：`input.mov`（替换为你的文件名）\n2. **裁剪参数**：\n   - `crop=w:h:x:y`：从坐标 `(x,y)` 开始，截取宽度 `w`、高度 `h` 的区域。\n   - 你的需求是从 `(0, 65)` 到 `(1173, 769)`，因此：\n     - 宽度 `w = 1173 - 0 = 1173`\n     - 高度 `h = 769 - 65 = 704`\n     - 起始坐标 `(x,y) = (0, 65)`\n3. **输出格式**：`mp4`（默认使用 H.264 编码）\n\n### 完整命令：\n```bash\nffmpeg -i input.mov -filter:v \"crop=1173:704:0:65\" -c:a copy output.mp4\n```\n\n### 参数说明：\n- `-i input.mov`：指定输入文件。\n- `-filter:v \"crop=1173:704:0:65\"`：视频裁剪滤镜。\n- `-c:a copy`：直接复制音频流（无需重新编码，节省时间）。\n- `output.mp4`：输出文件名。\n\n### 其他选项：\n- 如果需要控制视频质量，可以添加 `-crf` 参数（默认 23，值越小质量越高）：\n  ```bash\n  ffmpeg -i input.mov -filter:v \"crop=1173:704:0:65\" -crf 18 -c:a copy output.mp4\n  ```\n- 如果需要硬件加速（如 NVIDIA GPU），可以添加 `-hwaccel cuda` 等参数。\n\n### 注意：\n1. 确保 `ffmpeg` 已安装并添加到系统路径。\n2. 如果视频有旋转/缩放等元数据，可能需要先处理（如用 `-vf \"transpose=1\"` 旋转）。\n\n运行命令后，`output.mp4` 就是你需要的裁剪后视频。",
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