export method

Future<bool> export(String input, int? fps, String output, int height, int width,)

Implementation

Future<bool> export(
  String input,
  int? fps,
  String output,
  int height,
  int width,
) async {
  var h = '0';
  var w = '0';

  if (y == null || y == height) {
    h = 'H-h';
  } else {
    final _h = height / 2;

    if (y == _h) {
      h = '(H-h)/2';
    } else if (y! < _h) {
      h = '(H-h)/2-${_h - y!}';
    } else if (y! > _h) {
      h = '(H-h)/2+${y! - _h}';
    }
  }

  if (x == null || x == width) {
    w = 'W-w';
  } else {
    final _w = width / 2;

    if (x == _w) {
      w = '(W-w)/2';
    } else if (x! < _w) {
      w = '(W-w)/2-${_w - x!}';
    } else if (x! > _w) {
      w = '(W-w)/2+${x! - _w}';
    }
  }

  final overlay = 'overlay=$w:$h';

  final buffer = StringBuffer();

  if (opacity != null) {
    buffer.write('"$overlay:alpha=$opacity"');
  } else {
    buffer.write('"$overlay,"');
  }

  if (scale != null) {
    buffer.write('"scale=iw*$scale:ih*$scale;"');
  }

  return ffmpeg.execute([
    '-i',
    input,
    if (fps != null) ...['-r', '$fps'],
    '-i',
    await _getPath(),
    '-filter_complex',
    buffer.toString(),
    output,
    '-y'
  ]);
}