diff --git a/content/media/MediaDecoderStateMachine.cpp b/content/media/MediaDecoderStateMachine.cpp
index eda5925ce9a9..acf9f29a94e9 100644
--- a/content/media/MediaDecoderStateMachine.cpp
+++ b/content/media/MediaDecoderStateMachine.cpp
@@ -2707,7 +2707,8 @@ void MediaDecoderStateMachine::AdvanceFrame()
     // 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)) {
+    if (frameTime > 0  || (frameTime == 0 && mPlayDuration == 0) ||
+        mScheduler->IsRealTime()) {
       ReentrantMonitorAutoExit exitMon(mDecoder->GetReentrantMonitor());
       // If we have video, we want to increment the clock in steps of the frame
       // duration.
diff --git a/netwerk/protocol/rtsp/rtsp/RTSPSource.cpp b/netwerk/protocol/rtsp/rtsp/RTSPSource.cpp
index 7a7b93eabd8f..4eaaf17c90b2 100644
--- a/netwerk/protocol/rtsp/rtsp/RTSPSource.cpp
+++ b/netwerk/protocol/rtsp/rtsp/RTSPSource.cpp
@@ -231,9 +231,10 @@ void RTSPSource::performPlay(int64_t playTimeUs) {
 
     int64_t duration = 0;
     getDuration(&duration);
-    MOZ_ASSERT(playTimeUs < duration,
+    MOZ_ASSERT(duration == 0 || playTimeUs < duration,
                "Should never receive an out of bounds play time!");
-    if (playTimeUs >= duration) {
+    if (duration > 0 && playTimeUs >= duration) {
+        // if not a live stream and play time out of bounds
         return;
     }