generateThumbnail method

Stream<List<Uint8List?>> generateThumbnail()

Implementation

Stream<List<Uint8List?>> generateThumbnail() async* {
  final String _videoPath = videoFile.path;

  double _eachPart = videoDuration / numberOfThumbnails;

  List<Uint8List?> _byteList = [];

  // the cache of last thumbnail
  Uint8List? _lastBytes;

  for (int i = 1; i <= numberOfThumbnails; i++) {
    Uint8List? _bytes;
    _bytes = await VideoThumbnail.thumbnailData(
      video: _videoPath,
      imageFormat: ImageFormat.JPEG,
      timeMs: (_eachPart * i).toInt(),
      quality: quality,
    );

    // if current thumbnail is null use the last thumbnail
    if (_bytes != null) {
      _lastBytes = _bytes;
    } else {
      _bytes = _lastBytes;
    }

    _byteList.add(_bytes);

    yield _byteList;
  }
}