diff --git a/Source/WebCore/platform/graphics/gstreamer/MediaPlayerPrivateGStreamer.cpp b/Source/WebCore/platform/graphics/gstreamer/MediaPlayerPrivateGStreamer.cpp
index 8929f2e..419330d 100644
--- a/Source/WebCore/platform/graphics/gstreamer/MediaPlayerPrivateGStreamer.cpp
+++ b/Source/WebCore/platform/graphics/gstreamer/MediaPlayerPrivateGStreamer.cpp
@@ -1767,7 +1767,7 @@ static HashSet<String> mimeTypeCache()
"video/flv",
"video/mj2",
"video/mp2t",
- "video/mp4",
+// "video/mp4",
"video/mpeg",
"video/mpegts",
"video/ogg",
@@ -1794,6 +1794,13 @@ static HashSet<String> mimeTypeCache()
for (unsigned i = 0; i < (sizeof(mimeTypes) / sizeof(*mimeTypes)); ++i)
cache.add(String(mimeTypes[i]));
+ // Hack to make YouTube work, https://bugs.webkit.org/show_bug.cgi?id=135972
+ gint exit_status = 1;
+ GUniqueOutPtr<GError> error;
+ gboolean success = g_spawn_command_line_sync("rpm -qi gstreamer1-libav", nullptr, nullptr, &exit_status, &error.outPtr());
+ if (success && !error && !exit_status)
+ cache.add(String::fromUTF8("video/mp4"));
+
typeListInitialized = true;
return cache;
}