fix(HLS): Fix HLS load when using #EXT-X-I-FRAME-STREAM-INF without r…

…esolution (shaka-project#6680)

lib/hls/hls_parser.js

@@ -741,6 +741,18 @@ shaka.hls.HlsParser = class {
     /** @type {!Array.<!shaka.extern.Stream>} */
     let imageStreams = [];
 
+    // This assert is our own sanity check.
+    goog.asserts.assert(this.presentationTimeline_ == null,
+        'Presentation timeline created early!');
+    // We don't know if the presentation is VOD or live until we parse at least
+    // one media playlist, so make a VOD-style presentation timeline for now
+    // and change the type later if we discover this is live.
+    // Since the player will load the first variant chosen early in the process,
+    // there isn't a window during playback where the live-ness is unknown.
+    this.presentationTimeline_ = new shaka.media.PresentationTimeline(
+        /* presentationStartTime= */ null, /* delay= */ 0);
+    this.presentationTimeline_.setStatic(true);
+
     const getUris = () => {
       return [uri];
     };
@@ -845,18 +857,6 @@ shaka.hls.HlsParser = class {
           shaka.util.Error.Code.OPERATION_ABORTED);
     }
 
-    // This assert is our own sanity check.
-    goog.asserts.assert(this.presentationTimeline_ == null,
-        'Presentation timeline created early!');
-    // We don't know if the presentation is VOD or live until we parse at least
-    // one media playlist, so make a VOD-style presentation timeline for now
-    // and change the type later if we discover this is live.
-    // Since the player will load the first variant chosen early in the process,
-    // there isn't a window during playback where the live-ness is unknown.
-    this.presentationTimeline_ = new shaka.media.PresentationTimeline(
-        /* presentationStartTime= */ null, /* delay= */ 0);
-    this.presentationTimeline_.setStatic(true);
-
     // Single-variant streams aren't lazy-loaded, so for them we already have
     // enough info here to determine the presentation type and duration.
     if (playlist.type == shaka.hls.PlaylistType.MEDIA) {