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/splice.go

@@ -0,0 +1,67 @@
+package transcoder
+
+import (
+	"runtime"
+	"strings"
+
+	"github.com/stashapp/stash/pkg/ffmpeg"
+)
+
+type SpliceOptions struct {
+	OutputPath string
+	Format     ffmpeg.Format
+
+	VideoCodec ffmpeg.VideoCodec
+	VideoArgs  ffmpeg.Args
+
+	AudioCodec ffmpeg.AudioCodec
+	AudioArgs  ffmpeg.Args
+
+	// Verbosity is the logging verbosity. Defaults to LogLevelError if not set.
+	Verbosity ffmpeg.LogLevel
+}
+
+func (o *SpliceOptions) setDefaults() {
+	if o.Verbosity == "" {
+		o.Verbosity = ffmpeg.LogLevelError
+	}
+}
+
+// fixWindowsPath replaces \ with / in the given path because the \ isn't recognized as valid on windows ffmpeg
+func fixWindowsPath(str string) string {
+	if runtime.GOOS == "windows" {
+		return strings.ReplaceAll(str, `\`, "/")
+	}
+	return str
+}
+
+func Splice(concatFile string, options SpliceOptions) ffmpeg.Args {
+	options.setDefaults()
+
+	var args ffmpeg.Args
+	args = args.LogLevel(options.Verbosity)
+	args = args.Format(ffmpeg.FormatConcat)
+	args = args.Input(fixWindowsPath(concatFile))
+	args = args.Overwrite()
+
+	// if video codec is not provided, then use copy
+	if options.VideoCodec == "" {
+		options.VideoCodec = ffmpeg.VideoCodecCopy
+	}
+
+	args = args.VideoCodec(options.VideoCodec)
+	args = args.AppendArgs(options.VideoArgs)
+
+	// if audio codec is not provided, then skip it
+	if options.AudioCodec == "" {
+		args = args.SkipAudio()
+	} else {
+		args = args.AudioCodec(options.AudioCodec)
+	}
+	args = args.AppendArgs(options.AudioArgs)
+
+	args = args.Format(options.Format)
+	args = args.Output(options.OutputPath)
+
+	return args
+}