Business.MediaEncoderBusiness.PreparePreviewFile C# (CSharp) Метод

        public async Task PreparePreviewFile(MediaEncoderSettings settings, bool overwrite) {
            if (string.IsNullOrEmpty(settings.FileName))
                return;

            if (overwrite) {
                File.Delete(PreviewSourceFile);
                // Select default open method.
                if (settings.FileName.ToLower().EndsWith(".avi"))
                    settings.ConvertToAvi = false;
                else {
                    using (MediaInfoReader InfoReader = new MediaInfoReader()) {
                        InfoReader.LoadInfo(Settings.NaturalGroundingFolder + settings.FileName);
                        if (settings.ConvertToAvi && InfoReader.Height.HasValue && InfoReader.Height >= 720)
                            settings.ConvertToAvi = false;
                    }
                }
            }

            bool AviFileReady = File.Exists(PreviewSourceFile);
            if (!AviFileReady && settings.ConvertToAvi) 
                AviFileReady = await Task.Run(() => FfmpegBusiness.ConvertToAVI(Settings.NaturalGroundingFolder + settings.FileName, PreviewSourceFile, false));

            if (AviFileReady && settings.ConvertToAvi)
                await GetMediaInfo(PreviewSourceFile, settings);
            else {
                settings.ConvertToAvi = false;
                await GetMediaInfo(Settings.NaturalGroundingFolder + settings.FileName, settings);
            }

            // Auto-calculate crop settings.
            if (settings.CropLeft == 0 && settings.CropTop == 0 && settings.CropRight == 0 && settings.CropBottom == 0) {
                Rect AutoCrop = await Task.Run(() => FfmpegBusiness.GetAutoCropRect(settings, true));
                if (settings.CropLeft == 0)
                    settings.CropLeft = AutoCrop.Left;
                if (settings.CropTop == 0)
                    settings.CropTop = AutoCrop.Top;
                if (settings.CropRight == 0)
                    settings.CropRight = AutoCrop.Right;
                if (settings.CropBottom == 0)
                    settings.CropBottom = AutoCrop.Bottom;
            }
        }