如果结束时间读取错误，不报错，由后续逻辑处理

util/ffmpeg.go

@@ -300,3 +300,30 @@ func handleFfmpegProcess(ffmpegCmd []string) (bool, error) {
 		return true, nil
 	}
 }
+
+func GetVideoDuration(filePath string) (float64, error) {
+	ffprobeCmd := []string{
+		"ffprobe",
+		"-v", "error",
+		"-show_entries", "format=duration",
+		"-of", "default=noprint_wrappers=1:nokey=1",
+		filePath,
+	}
+
+	cmd := exec.Command(ffprobeCmd[0], ffprobeCmd[1:]...)
+	var out bytes.Buffer
+	cmd.Stdout = &out
+
+	err := cmd.Run()
+	if err != nil {
+		return 0, fmt.Errorf("failed to get video duration: %w", err)
+	}
+
+	durationStr := strings.TrimSpace(out.String())
+	duration, err := strconv.ParseFloat(durationStr, 64)
+	if err != nil {
+		return 0, fmt.Errorf("failed to parse video duration: %w", err)
+	}
+
+	return duration, nil
+}