Restructure ffmpeg (#2392)

* Refactor transcode generation
* Move phash generation into separate package
* Refactor image thumbnail generation
* Move JSONTime to separate package
* Ffmpeg refactoring
* Refactor live transcoding
* Refactor scene marker preview generation
* Refactor preview generation
* Refactor screenshot generation
* Refactor sprite generation
* Change ffmpeg.IsStreamable to return error
* Move frame rate calculation into ffmpeg
* Refactor file locking
* Refactor title set during scan
* Add missing lockmanager instance
* Return error instead of logging in MatchContainer

pkg/ffmpeg/transcoder/image.go

@@ -0,0 +1,38 @@
+package transcoder
+
+import (
+	"errors"
+
+	"github.com/stashapp/stash/pkg/ffmpeg"
+)
+
+var ErrUnsupportedFormat = errors.New("unsupported image format")
+
+type ImageThumbnailOptions struct {
+	InputFormat   ffmpeg.ImageFormat
+	OutputPath    string
+	MaxDimensions int
+	Quality       int
+}
+
+func ImageThumbnail(input string, options ImageThumbnailOptions) ffmpeg.Args {
+	var videoFilter ffmpeg.VideoFilter
+	videoFilter = videoFilter.ScaleMaxSize(options.MaxDimensions)
+
+	var args ffmpeg.Args
+
+	args = args.Overwrite().
+		ImageFormat(options.InputFormat).
+		Input(input).
+		VideoFilter(videoFilter).
+		VideoCodec(ffmpeg.VideoCodecMJpeg)
+
+	if options.Quality > 0 {
+		args = args.FixedQualityScaleVideo(options.Quality)
+	}
+
+	args = args.ImageFormat(ffmpeg.ImageFormatImage2Pipe).
+		Output(options.OutputPath)
+
+	return args
+}