\n", compID, width, height))
+
+ // 背景视频（独占 track=0）
+ relVideoPath := filepath.Base(videoPath)
+ sb.WriteString(fmt.Sprintf("
\n",
+ totalDuration, relVideoPath))
+
+ // 字幕/图片元素（从 track=1 开始，避免与视频重叠警告）
+ clipIndex := 1
+ for _, elem := range elements {
+ elemID := fmt.Sprintf("elem-%d", clipIndex)
+ animClass := s.animationCSS(elem.Animation)
+ style := s.buildElemStyle(elem, width, height)
+
+ // duration<=0 表示一直显示到视频结束
+ elemDuration := elem.Duration
+ if elemDuration <= 0 {
+ elemDuration = totalDuration - elem.StartTime
+ if elemDuration <= 0 {
+ elemDuration = totalDuration
+ }
+ }
+
+ // 确保覆盖层不在 track=0（视频专用）
+ trackIdx := elem.TrackIndex
+ if trackIdx <= 0 {
+ trackIdx = 1
+ }
+
+ if elem.Type == "image" {
+ imgStyle := style
+ if elem.Width > 0 {
+ imgStyle += fmt.Sprintf("width:%dpx;", elem.Width)
+ }
+ if elem.Height > 0 {
+ imgStyle += fmt.Sprintf("height:%dpx;", elem.Height)
+ }
+ sb.WriteString(fmt.Sprintf("
![](\"%s\")
\n",
+ elemID, animClass, elem.StartTime, elemDuration, trackIdx, html.EscapeString(elem.ImageURL), imgStyle))
+ } else {
+ bgStyle := ""
+ if elem.BgColor != "" {
+ if elem.BgOpacity > 0 && elem.BgOpacity < 1 {
+ bgStyle = fmt.Sprintf("background:%s;padding:12px 24px;border-radius:8px;", hexToRGBA(elem.BgColor, elem.BgOpacity))
+ } else {
+ bgStyle = fmt.Sprintf("background:%s;padding:12px 24px;border-radius:8px;", elem.BgColor)
+ }
+ }
+ sb.WriteString(fmt.Sprintf("
%s
\n",
+ elemID, animClass, elem.StartTime, elemDuration, trackIdx, style, bgStyle, html.EscapeString(elem.Text)))
+ }
+ clipIndex++
+ }
+
+ // 背景音乐
+ if audioPath != "" {
+ relAudioPath := filepath.Base(audioPath)
+ sb.WriteString(fmt.Sprintf("
\n",
+ totalDuration, clipIndex+100, relAudioPath))
+ }
+
+ sb.WriteString("