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/format.go

@@ -0,0 +1,43 @@
+package ffmpeg
+
+// Format represents the input/output format for ffmpeg.
+type Format string
+
+// Args converts the Format to a slice of arguments to be passed to ffmpeg.
+func (f Format) Args() []string {
+	if f == "" {
+		return nil
+	}
+
+	return []string{"-f", string(f)}
+}
+
+var (
+	FormatConcat   Format = "concat"
+	FormatImage2   Format = "image2"
+	FormatRawVideo Format = "rawvideo"
+	FormatMpegTS   Format = "mpegts"
+	FormatMP4      Format = "mp4"
+	FormatWebm     Format = "webm"
+	FormatMatroska Format = "matroska"
+)
+
+// ImageFormat represents the input format for an image for ffmpeg.
+type ImageFormat string
+
+// Args converts the ImageFormat to a slice of arguments to be passed to ffmpeg.
+func (f ImageFormat) Args() []string {
+	if f == "" {
+		return nil
+	}
+
+	return []string{"-f", string(f)}
+}
+
+var (
+	ImageFormatJpeg ImageFormat = "mjpeg"
+	ImageFormatPng  ImageFormat = "png_pipe"
+	ImageFormatWebp ImageFormat = "webp_pipe"
+
+	ImageFormatImage2Pipe ImageFormat = "image2pipe"
+)