v12: Fix DVR — disable HLS.js liveSync, manage live edge manually

v11 lỗi: override startLoad(cur-5) → HLS.js không load đúng segment → stream không phát.

Giải pháp v12: Đơn giản hơn, đáng tin cậy hơn:
- liveSyncDurationCount:0, liveMaxLatencyDurationCount:0 → HLS.js KHÔNG auto-snap về live
- Lần đầu load: tự seek về live edge (video.currentTime = video.duration)
- User tua DVR: HLS.js load segment bình thường, không can thiệp
- Nút LIVE: seek về live edge
- Không override startLoad, không intercept seeked → không loop, không side-effect

static/yt_live.js

@@ -1,6 +1,6 @@
-// === VNEWS — VTV LIVE + Inline Recorder v11 ===
+// === VNEWS — VTV LIVE + Inline Recorder v12 ===
 // Features: DVR 5-min rewind buffer (seek & stay), PiP, mini-player, INLINE RECORDER with ratio crop + AI title + Short AI upload
-// v11: Fix DVR snap-back — override hls.startLoad to block auto-live-snap. Only seek to live on initial load or LIVE btn click
+// v12: Fix DVR snap-back — disable HLS.js liveSync (liveSyncDurationCount:0), manage live edge manually. No override, no intercept
 
 (function(){
   if(window._ytLiveLoaded) return;
@@ -23,8 +23,7 @@
   let _dvrSeekBarTimer = null;
   let _dvrUserSeeking = false;      // true while user is dragging DVR seek handle
   let _dvrLastSeenEdge = false;    // track if playhead was at live edge before seek
-  let _dvrHasUserSeeked = false;   // true once user manually seeks back from live
-  let _dvrStartLoadOrig = null;    // original hls.startLoad reference
+  let _dvrAtLiveEdge = true;       // track if playhead is at live edge
 
   // ===== RECORDER STATE =====
   const _rec = {
@@ -686,10 +685,8 @@
       const bufferStart = Math.max(0, duration - DVR_BUFFER_SECONDS);
       const seekTime = bufferStart + pct * (duration - bufferStart);
       _dvrUserSeeking = !isRelease;
-      // v11: Mark as user-seeked if not at live edge
-      if (duration - seekTime > 5) {
-        _dvrHasUserSeeked = true;
-      }
+      // v12: Track live edge state
+      _dvrAtLiveEdge = (duration - seekTime < 2);
       video.currentTime = seekTime;
       if (isRelease) {
         video.play().catch(()=>{});
@@ -715,7 +712,7 @@
       const video = document.getElementById('vtv-player');
       if (video && _hls) {
         _dvrUserSeeking = false;
-        _dvrHasUserSeeked = false; // reset — allow auto-live again
+        _dvrAtLiveEdge = true;
         video.currentTime = video.duration;
         video.play().catch(()=>{});
         updateDVRUI();
@@ -726,17 +723,14 @@
     if (_dvrSeekBarTimer) clearInterval(_dvrSeekBarTimer);
     _dvrSeekBarTimer = setInterval(updateDVRUI, 1000);
 
-    // v11: Track live edge state; auto-clear _dvrHasUserSeeked when buffer catches up
+    // v12: Track live edge state for UI
     video.addEventListener('timeupdate', function() {
       if (!_hls) return;
       const dur = video.duration;
       if (!dur || !isFinite(dur)) return;
       const behind = dur - video.currentTime;
-      _dvrLastSeenEdge = (behind < 2);
-      // If playhead reached live edge naturally, allow auto-live again
-      if (behind < 1 && _dvrHasUserSeeked) {
-        _dvrHasUserSeeked = false;
-      }
+      _dvrAtLiveEdge = (behind < 2);
+      _dvrLastSeenEdge = _dvrAtLiveEdge;
     });
   }
 
@@ -853,60 +847,25 @@
     if(idx>=urls.length){loadEl.style.display='none';errEl.style.display='flex';errMsg.textContent=name+': Tất cả nguồn lỗi.';return;}
     const src=urls[idx]; loadEl.innerHTML='<div class="vtv-spinner"></div>Kết nối '+name+' ('+(idx+1)+'/'+urls.length+')...';
     if(typeof Hls!=='undefined'&&Hls.isSupported()){
-      // v11: DVR 5min — override hls.startLoad to prevent auto-live-snap
+      // v12: DVR 5min — disable HLS.js live sync entirely, manage live edge manually
       const hls=new Hls({
         enableWorker:true,lowLatencyMode:false,startLevel:0,capLevelToPlayerSize:true,
         maxBufferLength:120,maxMaxBufferLength:180,
         liveBackBufferLength:DVR_BUFFER_SECONDS,
-        liveSyncDurationCount:999999,liveMaxLatencyDurationCount:999999,
+        liveSyncDurationCount:0,liveMaxLatencyDurationCount:0,
         fragLoadingTimeOut:10000,manifestLoadingTimeOut:10000
       });
       _hls=hls; hls.loadSource(src); hls.attachMedia(video);
 
-      // v11: Override startLoad — only seek to live on initial load, never auto-snap back
-      _dvrStartLoadOrig = hls.startLoad.bind(hls);
-      hls.startLoad = function(position) {
-        // First call (initial load): seek to live edge
-        if (!_dvrHasUserSeeked && position === -1) {
-          _dvrStartLoadOrig(position);
-          return;
-        }
-        // After user sought back: load segments but DON'T seek to live edge
-        // Pass a large negative value to load from buffer start instead
-        if (_dvrHasUserSeeked && position === -1) {
-          // Load from current buffer position, not live edge
-          const dur = video.duration;
-          const cur = video.currentTime;
-          if (dur && isFinite(dur) && cur && isFinite(cur)) {
-            // Load from slightly behind current position to ensure smooth playback
-            _dvrStartLoadOrig(cur - 5);
-          } else {
-            _dvrStartLoadOrig(position);
-          }
-          return;
-        }
-        _dvrStartLoadOrig(position);
-      };
-
-      // v11: After manifest loaded, seek to live edge first, then play
+      // v12: After manifest loaded, seek to live edge first, then play
       hls.on(Hls.Events.MANIFEST_PARSED,(ev,data)=>{
         loadEl.style.display='none';video.style.display='block';
+        // Seek to live edge manually since we disabled auto-sync
         const dur = video.duration;
         if(dur && isFinite(dur)){ video.currentTime = dur; }
         video.play().catch(()=>{});
       });
 
-      // v11: Track when user manually seeks back from live
-      video.addEventListener('seeking', function() {
-        if (_dvrUserSeeking) return;
-        const dur = video.duration;
-        if (!dur || !isFinite(dur)) return;
-        const behind = dur - video.currentTime;
-        if (behind > 5) {
-          _dvrHasUserSeeked = true;
-        }
-      });
-
       let rec=0; hls.on(Hls.Events.ERROR,(ev,data)=>{if(data.fatal){if(data.type===Hls.ErrorTypes.NETWORK_ERROR){rec++;if(rec<=3)setTimeout(()=>hls.startLoad(),2000);else{hls.destroy();_hls=null;_tryPlay(video,urls,idx+1,name,loadEl,errEl,errMsg);}}else if(data.type===Hls.ErrorTypes.MEDIA_ERROR){try{hls.recoverMediaError();}catch(e){}}else{hls.destroy();_hls=null;_tryPlay(video,urls,idx+1,name,loadEl,errEl,errMsg);}}});
     }else if(video.canPlayType('application/vnd.apple.mpegurl')){
       video.src=src;