Keep playhead visible for recorded streams

public/app.js

@@ -1344,12 +1344,13 @@ function syncPlayhead() {
   const duration = state.duration;
   const hasDuration = Number.isFinite(duration) && duration > 0;
   const canScrub = state.seekable && hasDuration;
+  const showPlayhead = Boolean(state.session);
   const max = hasDuration ? duration : 1;
   const value = hasDuration ? clampNumber(currentTime, 0, max) : 0;
   const progress = hasDuration && max > 0 ? (value / max) * 100 : 0;
 
-  elements.playhead.hidden = !canScrub;
-  elements.playhead.setAttribute('aria-hidden', String(!canScrub));
+  elements.playhead.hidden = !showPlayhead;
+  elements.playhead.setAttribute('aria-hidden', String(!showPlayhead));
   elements.currentTime.textContent = formatTime(currentTime);
   elements.totalTime.textContent = formatTime(duration);
   elements.seek.max = String(max);

server/index.js

@@ -171,10 +171,13 @@ app.post('/api/session', async (request, response) => {
 
   const options = parsePlaybackOptions(request.body);
   const id = randomUUID();
-
-  const metadataStatus = METADATA_PROBE_ENABLED ? 'pending' : 'disabled';
-
-  sessions.set(id, {
+  const shouldProbeMetadata = METADATA_PROBE_ENABLED || canBestEffortResumeWithoutDuration({
+    sourceKind: source.kind,
+    originalUrl: url,
+    url: source.url,
+  });
+  const metadataStatus = shouldProbeMetadata ? 'pending' : 'disabled';
+  const session = {
     id,
     url: source.url,
     originalUrl: url,
@@ -189,12 +192,14 @@ app.post('/api/session', async (request, response) => {
     forceSplitPlayback: false,
     createdAt: Date.now(),
     lastUsedAt: Date.now(),
-  });
+  };
 
-  logInfo(`session created id=${shortId(id)} source=${source.kind} mode=${getSessionPlaybackConnectionMode(sessions.get(id))} fps=${options.fps} width=${options.width} quality=${options.quality}`);
+  sessions.set(id, session);
 
-  if (METADATA_PROBE_ENABLED) {
-    startSessionMetadataProbe(sessions.get(id));
+  logInfo(`session created id=${shortId(id)} source=${source.kind} mode=${getSessionPlaybackConnectionMode(session)} fps=${options.fps} width=${options.width} quality=${options.quality}`);
+
+  if (shouldProbeMetadata) {
+    startSessionMetadataProbe(session);
   }
 
   try {