该库用于生成动态 webp 格式视频缩略图

$ npm install -g fast-preview-cli
$ fpreview /path/to/video.mp4

fast-preview 需要安装 ffmpeg 才能工作。 如果设置了 FFMPEG_PATH 环境变量, fast-preview 将使用它作为 ffmpeg 可执行文件的完整路径。否则，它将尝试直接调用 ffmpeg（因此它应该在您的 PATH 中）。您还必须安装 ffprobe（在大多数发行版中它带有 ffmpeg）。同样，如果设置了 FFPROBE_PATH 环境变量，fast-preview 将使用它，否则它将尝试在 PATH 中调用它。

$ npm install fast-preview

fast-preview 模块返回一个构造器，你需要实例化并传入要转换的视频（目前支持 MP4 格式）, 并使用实例调用 exec 方法

var FastPreview = require("fast-preview").default;
var preview = new FastPreview("video.mp4");
preview.exec();

你可以传入一些配置

var FastPreview = require('fast-preview');
var preview = new FastPreview('video.mp4',{
  clip_count: 5,
  clip_time: 5,
  clip_select_strategy: 'max-size', // max-size min-size random
  clip_range: [0.1,0.9],
  fps_rate: 10, // number -1(default)
  output: {
    type: 'buffer' // 'buffer'(default) 'file' 'dir'
    path?: ''      // 输出类型不是buffer时需要传入文件或目录的路径
  },
  speed_multi: 2,
  width: 320, // number -1(default)
  height: -1  // number -1(default)
});
preview.exec()

可以使用的 options:

• clip_count: 要截取的视频片段的数量
• clip_time: 每个片段持续时间(秒)
• clip_select_strategy: 片段选择策略
• clip_range: 片段选择范围(视频时间的百分比)
• fps_rate: 图像帧率(-1: 保持原视频帧率)
• speed_multi: 片段播放速度的倍数
• output: 动态预览图生成的路径或 buffer
• width: 视频缩放宽度, 默认-1(按高度等比缩放)
• height: 视频缩放高度, 默认-1(按宽度等比缩放)

(The MIT License)

Copyright (c) 2021 PingChuanXi <[email protected]>

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