fix(HLS): Do not use EXT-X-PROGRAM-DATE-TIME on vod when there is onl…

…y video or audio (#7802)

Fixes #7774

Backported to v4.12.x

lib/hls/hls_parser.js

@@ -2763,12 +2763,23 @@ shaka.hls.HlsParser = class {
       }
     }
     this.notifySegmentsForStreams_(streamInfos.map((s) => s.stream));
-    const liveWithNoProgramaDateTime =
+
+    const activeStreamInfos = Array.from(this.uriToStreamInfosMap_.values())
+        .filter((s) => s.stream.segmentIndex);
+    const ContentType = shaka.util.ManifestParserUtils.ContentType;
+    const hasAudio =
+        activeStreamInfos.some((s) => s.stream.type == ContentType.AUDIO);
+    const hasVideo =
+        activeStreamInfos.some((s) => s.stream.type == ContentType.VIDEO);
+
+    const liveWithNoProgramDateTime =
         this.isLive_() && !this.usesProgramDateTime_;
+    const vodWithOnlyAudioOrVideo = !this.isLive_() &&
+        this.usesProgramDateTime_ && !(hasAudio && hasVideo);
     if (this.config_.hls.ignoreManifestProgramDateTime ||
-        liveWithNoProgramaDateTime) {
+        liveWithNoProgramDateTime || vodWithOnlyAudioOrVideo) {
       this.syncStreamsWithSequenceNumber_(
-          streamInfos, liveWithNoProgramaDateTime);
+          streamInfos, liveWithNoProgramDateTime);
     } else {
       this.syncStreamsWithProgramDateTime_(streamInfos);
       if (this.config_.hls.ignoreManifestProgramDateTimeForTypes.length > 0) {