Support image clips/gifs (#3583)

Co-authored-by: WithoutPants <53250216+WithoutPants@users.noreply.github.com>

internal/manager/task_generate_clip_preview.go

@@ -0,0 +1,68 @@
+package manager
+
+import (
+	"context"
+	"fmt"
+
+	"github.com/stashapp/stash/pkg/file"
+	"github.com/stashapp/stash/pkg/fsutil"
+	"github.com/stashapp/stash/pkg/image"
+	"github.com/stashapp/stash/pkg/logger"
+	"github.com/stashapp/stash/pkg/models"
+)
+
+type GenerateClipPreviewTask struct {
+	Image     models.Image
+	Overwrite bool
+}
+
+func (t *GenerateClipPreviewTask) GetDescription() string {
+	return fmt.Sprintf("Generating Preview for image Clip %s", t.Image.Path)
+}
+
+func (t *GenerateClipPreviewTask) Start(ctx context.Context) {
+	if !t.required() {
+		return
+	}
+
+	prevPath := GetInstance().Paths.Generated.GetClipPreviewPath(t.Image.Checksum, models.DefaultGthumbWidth)
+	filePath := t.Image.Files.Primary().Base().Path
+
+	clipPreviewOptions := image.ClipPreviewOptions{
+		InputArgs:  GetInstance().Config.GetTranscodeInputArgs(),
+		OutputArgs: GetInstance().Config.GetTranscodeOutputArgs(),
+		Preset:     GetInstance().Config.GetPreviewPreset().String(),
+	}
+
+	encoder := image.NewThumbnailEncoder(GetInstance().FFMPEG, GetInstance().FFProbe, clipPreviewOptions)
+	data, err := encoder.GetPreview(t.Image.Files.Primary(), models.DefaultGthumbWidth)
+	if err != nil {
+		logger.Errorf("getting preview for image %s: %w", filePath, err)
+		return
+	}
+
+	err = fsutil.WriteFile(prevPath, data)
+	if err != nil {
+		logger.Errorf("writing preview for image %s: %w", filePath, err)
+		return
+	}
+
+}
+
+func (t *GenerateClipPreviewTask) required() bool {
+	_, ok := t.Image.Files.Primary().(*file.VideoFile)
+	if !ok {
+		return false
+	}
+
+	if t.Overwrite {
+		return true
+	}
+
+	prevPath := GetInstance().Paths.Generated.GetClipPreviewPath(t.Image.Checksum, models.DefaultGthumbWidth)
+	if exists, _ := fsutil.FileExists(prevPath); exists {
+		return false
+	}
+
+	return true
+}