feat: add poster

backend/modules/tasks/discover/discover_medias.go

@@ -1,6 +1,7 @@
 package discover
 
 import (
+	"fmt"
 	"os"
 	"os/exec"
 	"path/filepath"
@@ -66,6 +67,12 @@ func (d *DiscoverMedias) RunE(from, to string) error {
 			if err := d.ffmpegVideoToM3U8(video, to); err != nil {
 				return errors.Wrapf(err, "ffmpeg video to m3u8: %s", video)
 			}
+
+			d.log.Infof("snapshot", video)
+			posterPath := filepath.Join(to, "poster.jpg")
+			if err := d.ffmpegVideoToPoster(video, posterPath, 5); err != nil {
+				return errors.Wrapf(err, "ffmpeg snapshot : %s", video)
+			}
 		}
 
 		audios := d.globAudio(dirPath)
@@ -213,3 +220,24 @@ func (d *DiscoverMedias) runCleanup(to string) {
 		}
 	}
 }
+
+// getSnapshot get the snapshot of target seconds of a video
+func (d *DiscoverMedias) ffmpegVideoToPoster(video string, output string, seconds int) error {
+	// ffmpeg -i input_video.mp4 -ss N -vframes 1 -vf "scale=width:height" output_image.jpg
+	args := []string{
+		"-i", video,
+		"-ss", fmt.Sprintf("00:%02d:00", seconds),
+		"-vframes", "1",
+		"-vf", "scale=640:360",
+		output,
+	}
+
+	d.log.Infof("cmd: ffmpeg %s", strings.Join(args, " "))
+	logs, err := exec.Command("ffmpeg", args...).CombinedOutput()
+	if err != nil {
+		return errors.Wrapf(err, "get snapshot: %s", video)
+	}
+
+	d.log.Infof("get snapshot: %s", logs)
+	return nil
+}