public VideoResampler(VideoFormat source, VideoFormat destination, SwsFlags flags = SwsFlags.FastBilinear)
{
Source = source;
Destination = destination;
Flags = flags;
ctx = FF.sws_getContext(
source.Width, source.Height, source.PixelFormat,
destination.Width, destination.Height, destination.PixelFormat,
flags, null, null, null);
}
