This command will not work!

Mencoder, ffmpeg, Mplayer, ffmpeg-php, flvtool2 (latest-version) are installed and working nice.
Maybe the reason is the chain-command using "&&", wich needs shell_exec and not exec.
What command is vshare using to execute this command?

$cmd_mencoder = "$config[mencoder] '$video_src' -o $video_flv -of lavf -oac mp3lame -lameopts abr:br=64 -ovc lavc -lavcopts vcodec=flv:vbitrate=400:mbd=2:mv0:trell:v4mv:cbp:l ast_pred=3 -srate 22050 -ofps 24 -vf harddup && $config[flvtool] -U $video_flv";