diff --git a/src/main/java/com/petstore/controller/ReportController.java b/src/main/java/com/petstore/controller/ReportController.java
index 497f792..e0cf044 100644
--- a/src/main/java/com/petstore/controller/ReportController.java
+++ b/src/main/java/com/petstore/controller/ReportController.java
@@ -62,8 +62,19 @@ public class ReportController {
         return "photo";
     }
 
+    /**
+     * 报告 JSON 中与「服务回顾短片」相关的字段（与小程序 / H5 共用契约）。
+     * <ul>
+     *   <li>{@code highlightVideoUrl} — 成片 MP4；库内为相对路径 {@code /api/upload/image/...} 或历史绝对 URL；接口统一为可访问绝对 URL。</li>
+     *   <li>{@code highlightShareCoverUrl} — 成片首帧 JPEG，用于分享卡片封面；截帧失败时为 {@code null}，前端按 utils 中分享封面降级链处理。</li>
+     *   <li>{@code highlightPosterUrl} — 预留（画布海报等）；当前恒为 {@code null}，前端可用 {@code highlightShareCoverUrl}。</li>
+     *   <li>{@code highlightVideoStatus} — {@code processing} | {@code done} | {@code failed} 等。</li>
+     * </ul>
+     */
     private void putHighlightFields(Map<String, Object> target, Report r) {
         target.put("highlightVideoUrl", r.getHighlightVideoUrl() != null ? fullUrl(r.getHighlightVideoUrl()) : null);
+        target.put("highlightShareCoverUrl", r.getHighlightShareCoverUrl() != null ? fullUrl(r.getHighlightShareCoverUrl()) : null);
+        target.put("highlightPosterUrl", null);
         target.put("highlightVideoStatus", r.getHighlightVideoStatus());
         target.put("highlightVideoError", r.getHighlightVideoError());
         target.put("highlightDurationSec", r.getHighlightDurationSec());
diff --git a/src/main/java/com/petstore/entity/Report.java b/src/main/java/com/petstore/entity/Report.java
index bae7511..97469c3 100644
--- a/src/main/java/com/petstore/entity/Report.java
+++ b/src/main/java/com/petstore/entity/Report.java
@@ -75,4 +75,11 @@ public class Report {
     /** 失败原因归类：material | service | network | unknown（对宠主展示，无技术细节） */
     @Column(name = "highlight_fail_reason", length = 16)
     private String highlightFailReason;
+
+    /**
+     * 成片首帧截图（竖屏内一帧），用于分享卡片封面等；相对路径如 {@code /api/upload/image/年/月/日/xxx_cover.jpg}。
+     * 与成片 MP4 同目录；仅当 highlight 状态为 done 且截帧成功时有值。
+     */
+    @Column(name = "highlight_share_cover_url", length = 500)
+    private String highlightShareCoverUrl;
 }
diff --git a/src/main/java/com/petstore/service/ReportHighlightVideoService.java b/src/main/java/com/petstore/service/ReportHighlightVideoService.java
index f468062..142ea5a 100644
--- a/src/main/java/com/petstore/service/ReportHighlightVideoService.java
+++ b/src/main/java/com/petstore/service/ReportHighlightVideoService.java
@@ -143,6 +143,7 @@ public class ReportHighlightVideoService {
             report.setHighlightVideoStatus("processing");
             report.setHighlightVideoError(null);
             report.setHighlightFailReason(null);
+            report.setHighlightShareCoverUrl(null);
             report.setHighlightComposeMode(mode);
             report.setUpdateTime(LocalDateTime.now());
             reportMapper.save(report);
@@ -356,13 +357,20 @@ public class ReportHighlightVideoService {
             Path finalPath = outDir.resolve(filename);
             Files.copy(afterBgm, finalPath, StandardCopyOption.REPLACE_EXISTING);
 
-            String publicBase = baseUrl.endsWith("/") ? baseUrl.substring(0, baseUrl.length() - 1) : baseUrl;
-            String url = publicBase + "/api/upload/image/" + datePath + "/" + filename;
+            String videoRel = "/api/upload/image/" + datePath + "/" + filename;
+            String coverFilename = filename.endsWith(".mp4")
+                    ? filename.substring(0, filename.length() - 4) + "_cover.jpg"
+                    : filename + "_cover.jpg";
+            Path coverPath = outDir.resolve(coverFilename);
+            String coverRel = extractVideoCoverFrame(finalPath, coverPath)
+                    ? "/api/upload/image/" + datePath + "/" + coverFilename
+                    : null;
 
             int durationRoundedSec = (int) Math.ceil(totalDurationSec);
             synchronized (lockFor(reportId)) {
                 reportMapper.findByIdAndDeletedFalse(reportId).ifPresent(r -> {
-                    r.setHighlightVideoUrl(url);
+                    r.setHighlightVideoUrl(videoRel);
+                    r.setHighlightShareCoverUrl(coverRel);
                     r.setHighlightVideoStatus("done");
                     r.setHighlightVideoError(null);
                     r.setHighlightFailReason(null);
@@ -451,6 +459,26 @@ public class ReportHighlightVideoService {
     /**
      * 服务前第一张 | 服务后第一张 左右拼接为 1080×1920 竖屏对比图（左前右后）。
      */
+    /**
+     * 从成片 MP4 截取首帧为 JPEG，供分享卡片等使用。
+     *
+     * @return 是否写出有效文件
+     */
+    private boolean extractVideoCoverFrame(Path mp4, Path outJpg) {
+        try {
+            int code = runFfmpeg(List.of(
+                    ffmpegBinary, "-y",
+                    "-i", mp4.toString(),
+                    "-map", "0:v:0",
+                    "-frames:v", "1",
+                    "-q:v", "2",
+                    outJpg.toString()));
+            return code == 0 && Files.isRegularFile(outJpg);
+        } catch (Exception e) {
+            return false;
+        }
+    }
+
     private boolean buildComparisonCover(Path beforeFile, Path afterFile, Path outJpg) throws Exception {
         String fc = "[0:v]scale=540:1920:force_original_aspect_ratio=decrease,pad=540:1920:(ow-iw)/2:(oh-ih)/2,setsar=1[va];"
                 + "[1:v]scale=540:1920:force_original_aspect_ratio=decrease,pad=540:1920:(ow-iw)/2:(oh-ih)/2,setsar=1[vb];"