5f59976
diff -up firefox-86.0/dom/media/mp4/MP4Demuxer.cpp.1670333 firefox-86.0/dom/media/mp4/MP4Demuxer.cpp
5f59976
--- firefox-86.0/dom/media/mp4/MP4Demuxer.cpp.1670333	2021-02-22 14:43:37.000000000 +0100
5f59976
+++ firefox-86.0/dom/media/mp4/MP4Demuxer.cpp	2021-02-23 17:59:14.824346217 +0100
8e33654
@@ -31,6 +31,8 @@ mozilla::LogModule* GetDemuxerLog() { re
8e33654
   DDMOZ_LOG(gMediaDemuxerLog, mozilla::LogLevel::Debug, "::%s: " arg, \
8e33654
             __func__, ##__VA_ARGS__)
8e33654
 
8e33654
+extern bool gUseKeyframeFromContainer;
8e33654
+
8e33654
 namespace mozilla {
8e33654
 
8e33654
 DDLoggedTypeDeclNameAndBase(MP4TrackDemuxer, MediaTrackDemuxer);
8e33654
@@ -394,6 +396,12 @@ already_AddRefed<MediaRawData> MP4TrackD
39ad1cc
           [[fallthrough]];
39ad1cc
         case H264::FrameType::OTHER: {
39ad1cc
           bool keyframe = type == H264::FrameType::I_FRAME;
8e33654
+          if (gUseKeyframeFromContainer) {
8e33654
+            if (sample->mKeyframe && sample->mKeyframe != keyframe) {
8e33654
+              sample->mKeyframe = keyframe;
8e33654
+            }
8e33654
+            break;
8e33654
+          }
8e33654
           if (sample->mKeyframe != keyframe) {
39ad1cc
             NS_WARNING(nsPrintfCString("Frame incorrectly marked as %skeyframe "
39ad1cc
                                        "@ pts:%" PRId64 " dur:%" PRId64
5f59976
diff -up firefox-86.0/dom/media/platforms/PDMFactory.cpp.1670333 firefox-86.0/dom/media/platforms/PDMFactory.cpp
5f59976
--- firefox-86.0/dom/media/platforms/PDMFactory.cpp.1670333	2021-02-22 15:47:05.000000000 +0100
5f59976
+++ firefox-86.0/dom/media/platforms/PDMFactory.cpp	2021-02-23 18:01:08.124715733 +0100
5f59976
@@ -59,6 +59,8 @@
8e33654
 
8e33654
 #include <functional>
8e33654
 
8e33654
+bool gUseKeyframeFromContainer = false;
8e33654
+
8e33654
 namespace mozilla {
8e33654
 
5f59976
 extern already_AddRefed<PlatformDecoderModule> CreateNullDecoderModule();
5f59976
@@ -537,9 +539,11 @@ void PDMFactory::CreateDefaultPDMs() {
feba2cc
   }
feba2cc
 #endif
8e33654
 #ifdef MOZ_FFMPEG
feba2cc
-  if (StaticPrefs::media_ffmpeg_enabled() &&
feba2cc
-      !CreateAndStartupPDM<FFmpegRuntimeLinker>()) {
feba2cc
-    mFailureFlags += DecoderDoctorDiagnostics::Flags::FFmpegFailedToLoad;
feba2cc
+  if (StaticPrefs::media_ffmpeg_enabled()) {
feba2cc
+    mFFmpegUsed = CreateAndStartupPDM<FFmpegRuntimeLinker>();
feba2cc
+    if (!mFFmpegUsed) {
feba2cc
+      mFailureFlags += DecoderDoctorDiagnostics::Flags::FFmpegFailedToLoad;
feba2cc
+    }
8e33654
   }
feba2cc
 #endif
feba2cc
 #ifdef MOZ_WIDGET_ANDROID
5f59976
@@ -551,8 +555,9 @@ void PDMFactory::CreateDefaultPDMs() {
feba2cc
 
feba2cc
   CreateAndStartupPDM<AgnosticDecoderModule>();
8e33654
 
feba2cc
-  if (StaticPrefs::media_gmp_decoder_enabled() &&
feba2cc
+  if (StaticPrefs::media_gmp_decoder_enabled() && !mFFmpegUsed &&
feba2cc
       !CreateAndStartupPDM<GMPDecoderModule>()) {
8e33654
+    gUseKeyframeFromContainer = true;
feba2cc
     mFailureFlags += DecoderDoctorDiagnostics::Flags::GMPPDMFailedToStartup;
feba2cc
   }
feba2cc
 }
5f59976
diff -up firefox-86.0/dom/media/platforms/PDMFactory.h.1670333 firefox-86.0/dom/media/platforms/PDMFactory.h
5f59976
--- firefox-86.0/dom/media/platforms/PDMFactory.h.1670333	2021-02-22 15:47:05.000000000 +0100
5f59976
+++ firefox-86.0/dom/media/platforms/PDMFactory.h	2021-02-23 17:59:14.824346217 +0100
5f59976
@@ -125,6 +125,8 @@ class PDMFactory final {
8e33654
 
feba2cc
   DecoderDoctorDiagnostics::FlagsSet mFailureFlags;
8e33654
 
feba2cc
+  bool mFFmpegUsed = false;
feba2cc
+
8e33654
   friend class RemoteVideoDecoderParent;
feba2cc
   static void EnsureInit();
feba2cc
   template <class T>