Implement ISO BMFF support in Media Source (try 2).

media/filters/ffmpeg_video_decoder.cc

Index: media/filters/ffmpeg_video_decoder.cc
diff --git a/media/filters/ffmpeg_video_decoder.cc b/media/filters/ffmpeg_video_decoder.cc
index 41bd0e49f60c95da847132362fab7f2cdbd4dd24..c8e512bc6ba6865066219e0ec7866125aa4db2c7 100644
--- a/media/filters/ffmpeg_video_decoder.cc
+++ b/media/filters/ffmpeg_video_decoder.cc
@@ -18,6 +18,7 @@
 #include "media/base/video_frame.h"
 #include "media/base/video_util.h"
 #include "media/ffmpeg/ffmpeg_common.h"
+#include "media/filters/ffmpeg_glue.h"
 
 namespace media {
 
@@ -64,6 +65,9 @@ FFmpegVideoDecoder::FFmpegVideoDecoder(
 void FFmpegVideoDecoder::Initialize(const scoped_refptr<DemuxerStream>& stream,
                                     const PipelineStatusCB& status_cb,
                                     const StatisticsCB& statistics_cb) {
+  // Ensure FFmpeg has been initialized
+  FFmpegGlue::GetInstance();
+
   if (!message_loop_) {
     message_loop_ = message_loop_factory_cb_.Run();
     message_loop_factory_cb_.Reset();