如何获取flutter ffmpeg执行的进度百分比

Question

我想获得 flutter 中 ffmpeg 执行的百分比

我有一些代码示例，但我不知道该怎么做

安卓示例：

int start = message.indexOf("time=");
    int end = message.indexOf(" bitrate");
    if (start != -1 && end != -1) {
        String duration = message.substring(start + 5, end);
        if (duration != "") {
            try {
                SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss.SSS");
                sdf.setTimeZone(TimeZone.getTimeZone("UTC"));
                dialog.setProgress((int)sdf.parse("1970-01-01 " + duration).getTime());                        
            }catch (ParseException e)
            {
                e.printStackTrace();
            }
        }
}

颤动代码：

  void statisticsCallback(Statistics statistics) {
print("Statistics: executionId: ${statistics.executionId}, time: ${statistics.time}, size: ${statistics.size}, bitrate: ${statistics.bitrate}, speed: ${statistics.speed}, videoFrameNumber: ${statistics.videoFrameNumber}, videoQuality: ${statistics.videoQuality}, videoFps: ${statistics.videoFps}");
  }

如何从 statsCallback 方法生成执行进度？

请帮帮我

Answer 1

以下文档：https://pub.dev/packages/flutter_ffmpeg

首先你必须启用StatisticsCallback，这可以放在initState中

  @override
  void initState() {
    super.initState();
    final FlutterFFmpegConfig _flutterFFmpegConfig = new FlutterFFmpegConfig();
    _flutterFFmpegConfig.enableStatisticsCallback(this.statisticsCallback);
  }

然后在你的statisticsCallback函数中，你得到statistics.time并totalDurationFile（以毫秒为单位）计算

   void statisticsCallback(Statistics statistics) {
    totalProgress = (statistics.time * 100) ~/ totalFileDuration;
    print("Statistics: executionId: ${statistics.executionId}, time: ${statistics.time}, size: ${statistics.size}, bitrate: ${statistics.bitrate}, speed: ${statistics.speed}, videoFrameNumber: ${statistics.videoFrameNumber}, videoQuality: ${statistics.videoQuality}, videoFps: ${statistics.videoFps}");
  }

更新：https ://pub.dev/packages/ffmpeg_kit_flutter

      FFmpegKit.executeAsync(arguments, (session) async {
        final returnCode = await session.getReturnCode();
        if (ReturnCode.isSuccess(returnCode)) {
          /// When sucess
        } else if (ReturnCode.isCancel(returnCode)) {
          /// When cancel
        }
      }, (Log log) {},
      (Statistics statistics) {
        if (statistics == null) {
          return;
        }
        if (statistics.getTime() > 0) {
          totalProgress = (statistics.getTime() * 100) ~/ totalVideoDuration;
        }
      });