Use newest FFMPEG API.

av_new_stream was changed to avformat_new_stream in ffmpeg 53.17.

Change-Id: Id31f57bf5e5cb67c439cdbc4f458471acd163abd
Merge topic 'ffmpeg_newest_api' into master

d48033e1 Use newest FFMPEG API.
Merge branch 'scalar_bar_font_scale-rel' into release

Change-Id: If84aee62312408127e153bd55e9cc65785f1eac5
Merge branch 'release'

Change-Id: I28148a961c10a676bcb55597ea592eb61dff0ede