--- a/dom/media/fmp4/MP4Demuxer.cpp
+++ b/dom/media/fmp4/MP4Demuxer.cpp
@@ -144,16 +144,18 @@ MP4Demuxer::Init()
   auto videoTrackCount = metadata.GetNumberTracks(TrackInfo::kVideoTrack);
   if (audioTrackCount == 0 && videoTrackCount == 0) {
     return InitPromise::CreateAndReject(
       MediaResult(NS_ERROR_DOM_MEDIA_DEMUXER_ERR,
                   RESULT_DETAIL("No MP4 audio or video tracks")),
       __func__);
   }
 
+  int totalValidTracks = 0;
+
   if (audioTrackCount != 0) {
     mAudioDemuxers.SetLength(audioTrackCount);
     for (size_t i = 0; i < audioTrackCount; i++) {
       UniquePtr<TrackInfo> info =
         metadata.GetTrackInfo(TrackInfo::kAudioTrack, i);
       if (!info) {
         if (result == NS_OK) {
           result = MediaResult(NS_ERROR_DOM_MEDIA_DEMUXER_ERR,
@@ -166,16 +168,17 @@ MP4Demuxer::Init()
         if (result == NS_OK) {
           result =
             MediaResult(NS_ERROR_DOM_MEDIA_DEMUXER_ERR,
                         RESULT_DETAIL("Invalid MP4 audio track index list"));
         }
         continue;
       }
       mAudioDemuxers[i] = new MP4TrackDemuxer(this, Move(info), indices);
+      totalValidTracks++;
     }
   }
 
   if (videoTrackCount != 0) {
     mVideoDemuxers.SetLength(videoTrackCount);
     for (size_t i = 0; i < videoTrackCount; i++) {
       UniquePtr<TrackInfo> info =
         metadata.GetTrackInfo(TrackInfo::kVideoTrack, i);
@@ -191,19 +194,27 @@ MP4Demuxer::Init()
         if (result == NS_OK) {
           result =
             MediaResult(NS_ERROR_DOM_MEDIA_DEMUXER_ERR,
                         RESULT_DETAIL("Invalid MP4 video track index list"));
         }
         continue;
       }
       mVideoDemuxers[i] = new MP4TrackDemuxer(this, Move(info), indices);
+      totalValidTracks++;
     }
   }
 
+  if (totalValidTracks == 0) {
+    return InitPromise::CreateAndReject(
+      MediaResult(NS_ERROR_DOM_MEDIA_DEMUXER_ERR,
+                  RESULT_DETAIL("No valid MP4 audio or video tracks")),
+      __func__);
+  }
+
   const mp4_demuxer::CryptoFile& cryptoFile = metadata.Crypto();
   if (cryptoFile.valid) {
     const nsTArray<mp4_demuxer::PsshInfo>& psshs = cryptoFile.pssh;
     for (uint32_t i = 0; i < psshs.Length(); i++) {
       mCryptoInitData.AppendElements(psshs[i].data);
     }
   }