gst-ffmpeg: fix for Security Advisory CVE-2014-2263

gst-ffmpeg: fix for Security Advisory CVE-2014-2263

The mpegts_write_pmt function in the MPEG2 transport stream (aka DVB)
muxer (libavformat/mpegtsenc.c) in FFmpeg, possibly 2.1 and earlier,
allows remote attackers to have unspecified impact and vectors, which
trigger an out-of-bounds write.

http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2014-2263

Signed-off-by: Yue Tao <Yue.Tao@windriver.com>
Signed-off-by: Roy Li <rongqing.li@windriver.com>
Signed-off-by: Saul Wold <sgw@linux.intel.com>