cron/transcoder.php : support use of ffmpeg (over libav)
cron/transcoder.php : support use of ffmpeg (over libav)

torinfo/xerteonlinetoolkits,thexerteproject/xerteonlinetoolkits,usernamenumber/xerteonlinetoolkits,torinfo/xerteonlinetoolkits,thexerteproject/xerteonlinetoolkits,torinfo/xerteonlinetoolkits,torinfo/xerteonlinetoolkits,thexerteproject/xerteonlinetoolkits,thexerteproject/xerteonlinetoolkits,thexerteproject/xerteonlinetoolkits,usernamenumber/xerteonlinetoolkits,torinfo/xerteonlinetoolkits,usernamenumber/xerteonlinetoolkits,usernamenumber/xerteonlinetoolkits