var fileInput = new FileInfo(@"Input.mp4");
	var fileOutput = new FileInfo(@"Output.mp4");

	using (var videoFileReader = new Accord.Video.FFMPEG.VideoFileReader())
	{
		videoFileReader.Open(fileInput.FullName);

		using (var videoFileWriter = new Accord.Video.FFMPEG.VideoFileWriter())
		{
			videoFileWriter.Open
			(
				fileOutput.FullName,
				videoFileReader.Width,
				videoFileReader.Height,
				// Shows correctly: 30 (Numerator: 30, Denominator: 1).
				videoFileReader.FrameRate,
				Accord.Video.FFMPEG.VideoCodec.H264
			);

			do
			{
				using (var bitmap = videoFileReader.ReadVideoFrame())
				{
					if (bitmap == null) { break; }
					videoFileWriter.WriteVideoFrame(bitmap);
				}
			}
			while (true);

			videoFileWriter.Close();
		}

		videoFileReader.Close();
	}

	using (var videoFileReader = new Accord.Video.FFMPEG.VideoFileReader())
	{
		videoFileReader.Open(fileOutput.FullName);

		// Shows incorrectly: 15360 (Numerator: 15360, Denominator: 1).
		var frameRate = videoFileReader.FrameRate;
	}