am a768b4f8: am 8f1efee1: Merge "MediaMuxer prefer not to use the MPEG4Writer in real time recording mode." into jb-mr2-dev

* commit 'a768b4f838f93823f661422d8193ebbff64b1b5a':
  MediaMuxer prefer not to use the MPEG4Writer in real time recording mode.