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/codec.go

@@ -0,0 +1,38 @@
+package ffmpeg
+
+type VideoCodec string
+
+func (c VideoCodec) Args() []string {
+	if c == "" {
+		return nil
+	}
+
+	return []string{"-c:v", string(c)}
+}
+
+var (
+	VideoCodecLibX264 VideoCodec = "libx264"
+	VideoCodecLibWebP VideoCodec = "libwebp"
+	VideoCodecBMP     VideoCodec = "bmp"
+	VideoCodecMJpeg   VideoCodec = "mjpeg"
+	VideoCodecVP9     VideoCodec = "libvpx-vp9"
+	VideoCodecVPX     VideoCodec = "libvpx"
+	VideoCodecLibX265 VideoCodec = "libx265"
+	VideoCodecCopy    VideoCodec = "copy"
+)
+
+type AudioCodec string
+
+func (c AudioCodec) Args() []string {
+	if c == "" {
+		return nil
+	}
+
+	return []string{"-c:a", string(c)}
+}
+
+var (
+	AudioCodecAAC     AudioCodec = "aac"
+	AudioCodecLibOpus AudioCodec = "libopus"
+	AudioCodecCopy    AudioCodec = "copy"
+)