--- a/dom/media/MediaDecoderStateMachine.cpp
+++ b/dom/media/MediaDecoderStateMachine.cpp
@@ -2965,21 +2965,17 @@ void MediaDecoderStateMachine::AdvanceFr
   // the monitor and get a staled value from GetCurrentTimeUs() which hits the
   // assertion in GetClock().
 
   if (currentFrame) {
     // Decode one frame and display it.
     int64_t delta = currentFrame->mTime - clock_time;
     TimeStamp presTime = nowTime + TimeDuration::FromMicroseconds(delta / mPlaybackRate);
     NS_ASSERTION(currentFrame->mTime >= mStartTime, "Should have positive frame time");
-    // Filter out invalid frames by checking the frame time. FrameTime could be
-    // zero if it's a initial frame.
-    int64_t frameTime = currentFrame->mTime - mStartTime;
-    if (frameTime > 0  || (frameTime == 0 && mPlayDuration == 0) ||
-        IsRealTime()) {
+    {
       ReentrantMonitorAutoExit exitMon(mDecoder->GetReentrantMonitor());
       // If we have video, we want to increment the clock in steps of the frame
       // duration.
       RenderVideoFrame(currentFrame, presTime);
     }
     MOZ_ASSERT(IsPlaying());
     MediaDecoder::FrameStatistics& frameStats = mDecoder->GetFrameStatistics();
     frameStats.NotifyPresentedFrame();