Note regarding filter_complex

[xErik]

Thank you for this package.

If using filter_complex use the run command.

Otherwise there will be hiccups in the filter evaluation.

Maybe that's helpful to add to the docs.

 await _ffmpeg.run(
      [
        '-i',
        inputAnimation,
        '-i',
        inputText,
        '-filter_complex',
        '[0:v]scale=-2:-1[a];[a][1]hstack=inputs=2',
        outputAnimation,
      ],
    );