fix logic get playing video

Author: HoangTran0410

scripts/fb_downloadWatchingVideo.js

@@ -14,6 +14,10 @@ export default {
     vi: "Tải bất kỳ video facebook nào mà bạn đang xem (watch / story / comment / reel / chat / bình luận / tin nhắn)",
   },
   badges: [BADGES.hot],
+  changeLogs: {
+    "2024-06-26": "fix logic",
+  },
+
   whiteList: ["https://*.facebook.com/*"],
   infoLink:
     "https://greasyfork.org/en/scripts/477748-facebook-video-downloader",
@@ -66,13 +70,27 @@ export const shared = {
           result.push({
             overlapScore: UfsGlobal.DOM.getOverlapScore(video),
             videoId: video.parentElement[key].children.props.videoFBID,
+
+            // https://stackoverflow.com/a/31196707/23648002
+            playing: !!(
+              video.currentTime > 0 &&
+              !video.paused &&
+              !video.ended &&
+              video.readyState > 2
+            ),
           });
         } catch (e) {
           console.log("ERROR on get videoFBID: ", e);
         }
       }
 
+      // if there is playing video => return that
+      let playingVideo = result.find((_) => _.playing);
+      if (playingVideo) return [playingVideo.videoId];
+
+      // else return all videos in-viewport
       return result
+        .filter((_) => _.videoId && (_.overlapScore > 0 || _.playing))
         .sort((a, b) => b.overlapScore - a.overlapScore)
         .map((_) => _.videoId);
     });