Fix the file mimetype reported by the mpeg4 extractor.

Change-Id: I72474c17757dba5867f55b0e99e76e9e4e32ce7b
related-to-bug: 6217289

Author: theandi666

media/libstagefright/MPEG4Extractor.cpp

@@ -373,7 +373,8 @@ status_t MPEG4Extractor::readMetaData() {
 
     if (mInitCheck == OK) {
         if (mHasVideo) {
-            mFileMetaData->setCString(kKeyMIMEType, "video/mp4");
+            mFileMetaData->setCString(
+                    kKeyMIMEType, MEDIA_MIMETYPE_CONTAINER_MPEG4);
         } else {
             mFileMetaData->setCString(kKeyMIMEType, "audio/mp4");
         }

media/libstagefright/MediaDefs.cpp

@@ -41,7 +41,7 @@ const char *MEDIA_MIMETYPE_AUDIO_RAW = "audio/raw";
 const char *MEDIA_MIMETYPE_AUDIO_FLAC = "audio/flac";
 const char *MEDIA_MIMETYPE_AUDIO_AAC_ADTS = "audio/aac-adts";
 
-const char *MEDIA_MIMETYPE_CONTAINER_MPEG4 = "video/mpeg4";
+const char *MEDIA_MIMETYPE_CONTAINER_MPEG4 = "video/mp4";
 const char *MEDIA_MIMETYPE_CONTAINER_WAV = "audio/wav";
 const char *MEDIA_MIMETYPE_CONTAINER_OGG = "application/ogg";
 const char *MEDIA_MIMETYPE_CONTAINER_MATROSKA = "video/x-matroska";