Flutter：获取 mp4 文件的长度/持续时间

Question

我很难从 mp4 文件中读取元数据。我想知道视频的时长（以秒为单位）。

这个文件位于assets/下，准确来说路径是assets/test.mp4

  int getLength() {
    var file = File('./assets/test.mp4');

    // get the length
    var length;

    return length;
  }

Answer 1

您可以使用视频播放器插件并使用此代码

https://pub.dev/packages/video_player

VideoPlayerController controller = VideoPlayerController.file('fileNameHere');
await controller.initialize();

print(controller.value.duration);

Answer 2

使用这个插件flutter_ffmpeg：^0.4.2

print("Duration: ${info.getMediaProperties()['duration']}");

final FlutterFFprobe _flutterFFprobe = new FlutterFFprobe();

 _flutterFFprobe.getMediaInformation("<file path or uri>").then((info) {
     print("Media Information");

     print("Path: ${info.getMediaProperties()['filename']}");
     print("Format: ${info.getMediaProperties()['format_name']}");
     print("Duration: ${info.getMediaProperties()['duration']}");
     print("Start time: ${info.getMediaProperties()['start_time']}");
     print("Bitrate: ${info.getMediaProperties()['bit_rate']}");
     Map<dynamic, dynamic> tags = info.getMediaProperties()['tags'];
     if (tags != null) {
         tags.forEach((key, value) {
             print("Tag: " + key + ":" + value + "\n");
         });
     }

     if (info.getStreams() != null) {
         List<StreamInformation> streams = info.getStreams();

         if (streams.length > 0) {
             for (var stream in streams) {
                 print("Stream id: ${stream.getAllProperties()['index']}");
                 print("Stream type: ${stream.getAllProperties()['codec_type']}");
                 print("Stream codec: ${stream.getAllProperties()['codec_name']}");
                 print("Stream full codec: ${stream.getAllProperties()['codec_long_name']}");
                 print("Stream format: ${stream.getAllProperties()['pix_fmt']}");
                 print("Stream width: ${stream.getAllProperties()['width']}");
                 print("Stream height: ${stream.getAllProperties()['height']}");
                 print("Stream bitrate: ${stream.getAllProperties()['bit_rate']}");
                 print("Stream sample rate: ${stream.getAllProperties()['sample_rate']}");
                 print("Stream sample format: ${stream.getAllProperties()['sample_fmt']}");
                 print("Stream channel layout: ${stream.getAllProperties()['channel_layout']}");
                 print("Stream sar: ${stream.getAllProperties()['sample_aspect_ratio']}");
                 print("Stream dar: ${stream.getAllProperties()['display_aspect_ratio']}");
                 print("Stream average frame rate: ${stream.getAllProperties()['avg_frame_rate']}");
                 print("Stream real frame rate: ${stream.getAllProperties()['r_frame_rate']}");
                 print("Stream time base: ${stream.getAllProperties()['time_base']}");
                 print("Stream codec time base: ${stream.getAllProperties()['codec_time_base']}");

                 Map<dynamic, dynamic> tags = stream.getAllProperties()['tags'];
                 if (tags != null) {
                   tags.forEach((key, value) {
                     print("Stream tag: " + key + ":" + value + "\n");
                   });
                 }
             }
         }
     }
 });

Answer 3

这是 Anandh Krishnan 答案的最新版本：

我们应该新安装 ffmpeg_kit_flutter 包。 另请注意：

安装ffmpeg_kit_flutter默认启用https包。

您可能需要安装

ffmpeg_kit_flutter_min_gpl

才能使用 x264 和 x265 格式。

我们可以通过以下方式读取以秒为单位的持续时间：

FFprobeKit.getMediaInformation('$videoFilePath').then((info) {
    print('Duration: ${info.getMediaInformation()!.getProperty('format')['duration']}');
});