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;
}
}
void GenerateThumbSq(Ffmpeg ffmpeg, string localSourceFile, string localThumbSqFile, MovieMetadata mm)
{
ffmpeg.ExtractFrame(localSourceFile, localThumbSqFile, GetThumbnailSeconds(mm));
using (var wand = new MagickWand(localThumbSqFile))
{
var width = (double)wand.ImageWidth;
var height = (double)wand.ImageHeight;
var aspect = width / height;
if (aspect >= THUMB_SQ_ASPECT)
{
var newWidth = (width / height) * THUMB_SQ_HEIGHT;
// scale image to final height
wand.ScaleImage((uint)newWidth, THUMB_SQ_HEIGHT);
// crop sides as needed
wand.CropImage(THUMB_SQ_WIDTH, THUMB_SQ_HEIGHT, (int)(newWidth - THUMB_SQ_WIDTH) / 2, 0);
}
else
{
var newHeight = THUMB_SQ_WIDTH / (width / height);
// scale image to final width
wand.ScaleImage(THUMB_SQ_WIDTH, (uint)newHeight);
// crop top and bottom as needed
wand.CropImage(THUMB_SQ_WIDTH, THUMB_SQ_HEIGHT, 0, (int)(newHeight - THUMB_SQ_HEIGHT) / 2);
}
// sharpen after potentially resizing
// http://www.imagemagick.org/Usage/resize/#resize_unsharp
wand.UnsharpMaskImage(0, 0.7, 0.7, 0.008);
wand.WriteImage(localThumbSqFile, true);
mm.ThumbSqHeight = THUMB_SQ_HEIGHT;
mm.ThumbSqWidth = THUMB_SQ_WIDTH;
}
}
