fix(SUP-39894): fix bug in seekToLiveEdge (#747)

Co-authored-by: Moshe Maor <moshe.mar@kaltura.com>

src/engines/html5/media-source/adapters/native-adapter.ts

@@ -122,8 +122,6 @@ export default class NativeAdapter extends BaseMediaSourceAdapter {
 
   private _waitingEventTriggered: boolean = false;
 
-  private _wasCurrentTimeSetSuccessfully!: boolean;
-
   private _segmentDuration: number = 0;
 
   private _startTimeOfDvrWindowInterval: number | undefined;
@@ -337,7 +335,6 @@ export default class NativeAdapter extends BaseMediaSourceAdapter {
    * @returns {Promise<Object>} - The loaded data
    */
   public load(startTime?: number): Promise<{tracks: Track[]}> {
-    this._wasCurrentTimeSetSuccessfully = false;
     this._maybeSetDrmPlayback();
     if (!this._loadPromise) {
       this._loadPromise = new Promise<{tracks: Track[]}>((resolve, reject) => {
@@ -541,9 +538,11 @@ export default class NativeAdapter extends BaseMediaSourceAdapter {
         this._handleLiveDurationChange();
       }
     };
-    if (!this.isLive()) {
-      this._setStartTime(startTime);
+
+    if (startTime !== undefined && startTime > -1) {
+      this._videoElement.currentTime = startTime;
     }
+
     if (this._videoElement.textTracks.length > 0) {
       parseTracksAndResolve();
     } else {
@@ -556,7 +555,6 @@ export default class NativeAdapter extends BaseMediaSourceAdapter {
     if (typeof startTime === 'number' && startTime > -1) {
       this._videoElement.currentTime = startTime;
     }
-    this._wasCurrentTimeSetSuccessfully = true;
   }
 
   private _onTimeUpdate(): void {
@@ -1267,10 +1265,6 @@ export default class NativeAdapter extends BaseMediaSourceAdapter {
     return this._videoElement.duration === Infinity;
   }
 
-  public isOnLiveEdge(): boolean {
-    return this._wasCurrentTimeSetSuccessfully ? super.isOnLiveEdge() : false;
-  }
-
   /**
    * Handling live duration change (as safari doesn't trigger durationchange event on live playback)
    * @function _handleLiveDurationChange

src/engines/html5/media-source/base-media-source-adapter.ts

@@ -224,6 +224,10 @@ export default class BaseMediaSourceAdapter extends FakeEventTarget implements I
   }
 
   public isOnLiveEdge(): boolean {
+    if(this.getSegmentDuration()===0){
+      //If no segment duration, we cannot estimate live edge
+      return true;
+    }
     return this.liveDuration - this._videoElement.currentTime <= this.getSegmentDuration() * CURRENT_OR_NEXT_SEGMENT_COUNT;
   }
   // eslint-disable-next-line

src/player.ts

@@ -2247,7 +2247,10 @@ export default class Player extends FakeEventTarget {
       if (!this._firstPlay) {
         return outOfDvr;
       } else {
-        return !!this.src && !this.isOnLiveEdge();
+        return !!this.src && !this.isOnLiveEdge()
+            // Live video can be set with explicit start time,(e.g. startOver)
+            // in that case we don't want to move to the liveEdge
+            && this._sources.startTime === undefined;
       }
     }
     return false;