Flutter_ffmpeg : how to get video and audio from url or storage

Question

实际上，我很困惑如何通过 url 或存储将视频和音频文件提供给 Flutter ffmpeg。所以它可以通过人造黄油给我输出。我不知道 ffmpeg 如何在 Flutter 中工作。我使用路径提供程序来将视频和音频文件提供给 ffmpeg，但我没有得到任何文档显示如何向 ffmpeg 提供视频或音频文件。所以请任何人都可以告诉我如何向ffmpeg提供文件，这对我有很大帮助，谢谢。
我尝试从 Flutter ffmpeg 文档中添加一些代码，无论我做什么，我总是会遇到一些未知错误。

final FlutterFFmpeg _flutterFFmpeg = new FlutterFFmpeg();
  
var arguments = ["-i", "file1.mp4", "-c:a", "mpeg4", "file2.mp3"];
  
VideoAudio.executeWithArguments(arguments).then((rc) => print("FFmpeg process exited with rc $rc"));

Answer 1

1.服务器地址

    final FlutterFFprobe _flutterFFprobe = new FlutterFFprobe();
    _flutterFFprobe
        .execute("-print_format json -show_chapters  \ ${'url'}") //server url
        .then((rc) => print(rc));
    final FlutterFFmpegConfig _flutterFFmpegConfig = new FlutterFFmpegConfig();
    _flutterFFmpegConfig.enableLogCallback(this.logCallback);

void logCallback(int level, String message) {
 // Response of FFMPEG 
}

2.本地存储

  File file = File('/storage/emulated/0/OTT/out.mp4'); // local stoage 
    final FlutterFFmpegConfig _flutterFFmpegConfig = new FlutterFFmpegConfig();
    _flutterFFprobe
        .execute("-print_format json -show_chapters  \ ${file.path}")
        .then((rc) => print(rc));

    _flutterFFmpegConfig.enableLogCallback(this.logCallback); 


void logCallback(int level, String message) {
 // Response of FFMPEG 
}