void GenerateThumbnail(Ffmpeg ffmpeg, string localSourceFile, string localThumbnailFile, MovieMetadata mm)
{
ffmpeg.ExtractFrame(localSourceFile, localThumbnailFile, GetThumbnailSeconds(mm));
using (var wand = new MagickWand(localThumbnailFile))
{
wand.GetLargestDimensionsKeepingAspectRatio(THUMB_WIDTH, THUMB_HEIGHT, out uint width, out uint height);
wand.ScaleImage(width, height);
// sharpen after potentially resizing
// http://www.imagemagick.org/Usage/resize/#resize_unsharp
wand.UnsharpMaskImage(0, 0.7, 0.7, 0.008);
wand.WriteImage(localThumbnailFile, true);
mm.ThumbHeight = (int)height;
mm.ThumbWidth = (int)width;
}
}