Added scene preview generator

ffmpeg/encoder_transcode.go

@@ -0,0 +1,20 @@
+package ffmpeg
+
+type TranscodeOptions struct {
+	OutputPath string
+}
+
+func (e *Encoder) Transcode(probeResult VideoFile, options TranscodeOptions) {
+	args := []string{
+		"-i", probeResult.Path,
+		"-c:v", "libx264",
+		"-profile:v", "high",
+		"-level", "4.2",
+		"-preset", "superfast",
+		"-crf", "23",
+		"-vf", "scale=iw:-2",
+		"-c:a", "aac",
+		options.OutputPath,
+	}
+	_, _ = e.run(probeResult, args)
+}