--- a/dom/media/MediaFormatReader.cpp
+++ b/dom/media/MediaFormatReader.cpp
@@ -484,17 +484,20 @@ bool
 MediaFormatReader::ShouldSkip(bool aSkipToNextKeyframe, media::TimeUnit aTimeThreshold)
 {
   MOZ_ASSERT(HasVideo());
   media::TimeUnit nextKeyframe;
   nsresult rv = mVideo.mTrackDemuxer->GetNextRandomAccessPoint(&nextKeyframe);
   if (NS_FAILED(rv)) {
     return aSkipToNextKeyframe;
   }
-  return nextKeyframe < aTimeThreshold && nextKeyframe.ToMicroseconds() >= 0;
+  return (nextKeyframe < aTimeThreshold ||
+          (mVideo.mTimeThreshold &&
+           mVideo.mTimeThreshold.ref().mTime < aTimeThreshold)) &&
+         nextKeyframe.ToMicroseconds() >= 0;
 }
 
 RefPtr<MediaDecoderReader::MediaDataPromise>
 MediaFormatReader::RequestVideoData(bool aSkipToNextKeyframe,
                                     int64_t aTimeThreshold)
 {
   MOZ_ASSERT(OnTaskQueue());
   MOZ_DIAGNOSTIC_ASSERT(mSeekPromise.IsEmpty(), "No sample requests allowed while seeking");