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/container.go

@@ -0,0 +1,59 @@
+package ffmpeg
+
+type Container string
+type ProbeAudioCodec string
+
+const (
+	Mp4      Container = "mp4"
+	M4v      Container = "m4v"
+	Mov      Container = "mov"
+	Wmv      Container = "wmv"
+	Webm     Container = "webm"
+	Matroska Container = "matroska"
+	Avi      Container = "avi"
+	Flv      Container = "flv"
+	Mpegts   Container = "mpegts"
+
+	Aac                ProbeAudioCodec = "aac"
+	Mp3                ProbeAudioCodec = "mp3"
+	Opus               ProbeAudioCodec = "opus"
+	Vorbis             ProbeAudioCodec = "vorbis"
+	MissingUnsupported ProbeAudioCodec = ""
+
+	Mp4Ffmpeg      string = "mov,mp4,m4a,3gp,3g2,mj2" // browsers support all of them
+	M4vFfmpeg      string = "mov,mp4,m4a,3gp,3g2,mj2" // so we don't care that ffmpeg
+	MovFfmpeg      string = "mov,mp4,m4a,3gp,3g2,mj2" // can't differentiate between them
+	WmvFfmpeg      string = "asf"
+	WebmFfmpeg     string = "matroska,webm"
+	MatroskaFfmpeg string = "matroska,webm"
+	AviFfmpeg      string = "avi"
+	FlvFfmpeg      string = "flv"
+	MpegtsFfmpeg   string = "mpegts"
+	H264           string = "h264"
+	H265           string = "h265" // found in rare cases from a faulty encoder
+	Hevc           string = "hevc"
+	Vp8            string = "vp8"
+	Vp9            string = "vp9"
+	Mkv            string = "mkv" // only used from the browser to indicate mkv support
+	Hls            string = "hls" // only used from the browser to indicate hls support
+)
+
+var ffprobeToContainer = map[string]Container{
+	Mp4Ffmpeg:      Mp4,
+	WmvFfmpeg:      Wmv,
+	AviFfmpeg:      Avi,
+	FlvFfmpeg:      Flv,
+	MpegtsFfmpeg:   Mpegts,
+	MatroskaFfmpeg: Matroska,
+}
+
+func MatchContainer(format string, filePath string) (Container, error) { // match ffprobe string to our Container
+	container := ffprobeToContainer[format]
+	if container == Matroska {
+		return magicContainer(filePath) // use magic number instead of ffprobe for matroska,webm
+	}
+	if container == "" { // if format is not in our Container list leave it as ffprobes reported format_name
+		container = Container(format)
+	}
+	return container, nil
+}