Added scene marker generator

ffmpeg/encoder_marker.go

@@ -0,0 +1,58 @@
+package ffmpeg
+
+import (
+	"fmt"
+	"strconv"
+)
+
+type SceneMarkerOptions struct {
+	ScenePath string
+	Seconds       int
+	Width      int
+	OutputPath string
+}
+
+func (e *Encoder) SceneMarkerVideo(probeResult VideoFile, options SceneMarkerOptions) error {
+	args := []string{
+		"-v", "quiet",
+		"-ss", strconv.Itoa(options.Seconds),
+		"-t", "20",
+		"-i", probeResult.Path,
+		"-c:v", "libx264",
+		"-profile:v", "high",
+		"-level", "4.2",
+		"-preset", "veryslow",
+		"-crf", "24",
+		"-movflags", "+faststart",
+		"-threads", "4",
+		"-vf", fmt.Sprintf("scale=%v:-2", options.Width),
+		"-sws_flags", "lanczos",
+		"-c:a", "aac",
+		"-b:a", "64k",
+		"-strict", "-2",
+		options.OutputPath,
+	}
+	_, err := e.run(probeResult, args)
+	return err
+}
+
+func (e *Encoder) SceneMarkerImage(probeResult VideoFile, options SceneMarkerOptions) error {
+	args := []string{
+		"-v", "quiet",
+		"-ss", strconv.Itoa(options.Seconds),
+		"-t", "5",
+		"-i", probeResult.Path,
+		"-c:v", "libwebp",
+		"-lossless", "1",
+		"-q:v", "70",
+		"-compression_level", "6",
+		"-preset", "default",
+		"-loop", "0",
+		"-threads", "4",
+		"-vf", fmt.Sprintf("scale=%v:-2,fps=12", options.Width),
+		"-an",
+		options.OutputPath,
+	}
+	_, err := e.run(probeResult, args)
+	return err
+}