compressVideo static method

Implementation

static Future<FFVideoCutModel> compressVideo(String videoPath,
    {double? startValue, double? endValue}) async {
  FFVideoCutModel cutModel = new FFVideoCutModel(
    path: videoPath,
  );

  File oldFile = File(videoPath);
  if (await oldFile.exists() == false) return cutModel;

  MediaInformation info = await ffprobe.getMediaInformation(videoPath);
  double fileDuration = double.parse(info.getMediaProperties()!['duration']);
  int size = int.parse(info.getMediaProperties()!['size']);

  cutModel.millSecond = fileDuration;
  cutModel.size = size;

  StreamInformation streamInfo = info.getStreams()![0];
  var width = streamInfo.getAllProperties()['width'] ?? 0;
  var height = streamInfo.getAllProperties()['height'] ?? 0;
  cutModel.width = width;
  cutModel.height = height;

  if (size <= 1024 * 1024 * 10) {
    // 小于10M，不进行压缩
    return cutModel;
  }

  startValue = startValue ?? 0;
  endValue = endValue ?? fileDuration;

  var cut = ' -ss $startValue -t ${endValue - startValue}';

  var svg = '';
  if (width > height) {
    if (width > 1080) svg = " -vf scale=1080:-1";
    // svg = " -s 720*480";
  } else {
    if (height > 1080) svg = " -vf scale=-1:1080";
    // svg = " -s 480*720";
  }

  var bit = ' -b:v 500k';

  // -strict -2 -qscale 0 -intra //重新编码，会导致文件增大
  cutModel.path = await getVideoRootDirectory() + '${const Uuid().v4()}.mp4';
  var cmd = '-i $videoPath$cut$svg$bit ${cutModel.path}';
  print('cmd === $cmd');

  try {
    await ffmpeg.execute(cmd);
    print('压缩成功');
    MediaInformation info_new = await ffprobe.getMediaInformation(cutModel.path!);

    var oldSize = info.getMediaProperties()!['size'];
    var newSize = info_new.getMediaProperties()!['size'];
    var compressRadio = double.parse(newSize) / double.parse(oldSize);
    cutModel.size = int.parse(newSize.toString());
    cutModel.millSecond = endValue! - startValue!;
    cutModel.width = info_new.getStreams()![0].getAllProperties()['width'];
    cutModel.height = info_new.getStreams()![0].getAllProperties()['height'];

    print('压缩前大小：$oldSize\n压缩后大小：$newSize\n压缩比：$compressRadio');
  } catch (e) {
    // cutModel.path = videoPath;
    print('压缩失败');
  }

  return cutModel;
}