Clear renderedFirstFrame at stream changes even if no reconfiguration is needed

This ensures a more consistent playback behavior no matter if an item is the
first playlist item or a later one. For example, each playlist item gets its
own onRenderedFirstFrame callback and other logic within the renderer that
force renders the first frame more quickly is also triggered.

PiperOrigin-RevId: 272434814

library/core/src/main/java/com/google/android/exoplayer2/video/MediaCodecVideoRenderer.java

@@ -802,9 +802,10 @@ public class MediaCodecVideoRenderer extends MediaCodecRenderer {
     long elapsedRealtimeNowUs = SystemClock.elapsedRealtime() * 1000;
     long elapsedRealtimeNowUs = SystemClock.elapsedRealtime() * 1000;
     long elapsedSinceLastRenderUs = elapsedRealtimeNowUs - lastRenderTimeUs;
     long elapsedSinceLastRenderUs = elapsedRealtimeNowUs - lastRenderTimeUs;
     boolean isStarted = getState() == STATE_STARTED;
     boolean isStarted = getState() == STATE_STARTED;
-    // Don't force output until we joined and always render first frame if not joining.
+    // Don't force output until we joined and the position reached the current stream.
     boolean forceRenderOutputBuffer =
     boolean forceRenderOutputBuffer =
         joiningDeadlineMs == C.TIME_UNSET
         joiningDeadlineMs == C.TIME_UNSET
+            && positionUs >= outputStreamOffsetUs
             && (!renderedFirstFrame
             && (!renderedFirstFrame
                 || (isStarted && shouldForceRenderOutputBuffer(earlyUs, elapsedSinceLastRenderUs)));
                 || (isStarted && shouldForceRenderOutputBuffer(earlyUs, elapsedSinceLastRenderUs)));
     if (forceRenderOutputBuffer) {
     if (forceRenderOutputBuffer) {
@@ -956,6 +957,7 @@ public class MediaCodecVideoRenderer extends MediaCodecRenderer {
           pendingOutputStreamSwitchTimesUs,
           pendingOutputStreamSwitchTimesUs,
           /* destPos= */ 0,
           /* destPos= */ 0,
           pendingOutputStreamOffsetCount);
           pendingOutputStreamOffsetCount);
+      clearRenderedFirstFrame();
     }
     }
   }
   }