php - At least one output file must be specified -

i using command in ffmpeg

   ffmpeg -i test.flv -i /var/www/phpvibe/logo.gif -filter_complex "scale=1200:-1,overlay=0:0" -s 1280x720 -vcodec libx264 -s 640x360 -movflags test.mp4 2>&1 

but getting this

 string(42) "at least 1 output file must specified" 

updated:-

php code:-

 $output ='{ffmpeg-cmd} -i {input} -i /var/www/phpvibe/logo.gif -filter_complex "scale=1200:-1,overlay=0:0" -s 1280x720 -vcodec libx264 -s {ffmpeg-vsize} -threads 4 -movflags {output}.mp4 2>&1'; 

complete output:-

  array(33) {   [0]=>  string(83) "ffmpeg version git-2015-05-11-94c20de copyright (c)  2000-2015 ffmpeg developers"  [1]=>  string(51) "  built gcc 4.6 (ubuntu/linaro 4.6.3-1ubuntu5)"  [2]=> string(243) "  configuration: --enable-gpl --enable-libfaac --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-librtmp --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-nonfree --enable-version3" [3]=>   string(40) "  libavutil      54. 23.101 / 54. 23.101" [4]=> string(40) "  libavcodec     56. 38.100 / 56. 38.100" [5]=> string(40) "  libavformat    56. 32.100 / 56. 32.100" [6]=> string(40) "  libavdevice    56.  4.100 / 56.  4.100" [7]=> string(40) "  libavfilter     5. 16.101 /  5. 16.101" [8]=> string(40) "  libswscale      3.  1.101 /  3.  1.101" [9]=> string(40) "  libswresample   1.  1.100 /  1.  1.100" [10]=> string(40) "  libpostproc    53.  3.100 / 53.  3.100" [11]=> string(47) "trailing options found on commandline." [12]=> string(31) "input #0, flv, 'test.flv':" [13]=>  string(11) "  metadata:" [14]=> string(28) "    audiosize       : 150117"  [15]=>  string(26) "    canseektoend    : true"  [16]=>  string(29) "    datasize        : 1015662"  [17]=>  string(26) "    hasaudio        : true"  [18]=>  string(27) "    hascuepoints    : false"  [19]=>  string(26) "    haskeyframes    : true"  [20]=>  string(26) "    hasmetadata     : true"  [21]=>  string(26) "    hasvideo        : true"  [22]=>  string(24) "    lasttimestamp   : 42"  [23]=>  string(72) "    metadatacreator : flvtool++ (facebook, motion project, dweatherford)"  [24]=>  string(25) "    totalframes     : 229"  [25]=>  string(28) "    videosize       : 856032"  [26]=>  string(59) "  duration: 00:00:42.27, start: 0.066000, bitrate: 192 kb/s"  [27]=>  string(124) "    stream #0:0: video: h264 (high), yuv420p, 176x144 [sar 12:11 dar 4:3], 165 kb/s, 30.30 fps, 29.97 tbr, 1k tbn, 59.94 tbc"  [28]=>  string(64) "    stream #0:1: audio: aac (lc), 8000 hz, stereo, fltp, 29 kb/s"  [29]=>  string(48) "input #1, gif, '/var/www/phpvibe/logo.gif':"  [30]=> string(29) "  duration: n/a, bitrate: n/a"  [31]=>  string(67) "    stream #1:0: video: gif, bgra, 90x55, 100 tbr, 100 tbn, 100 tbc"  [32]=>  string(42) "at least 1 output file must specified" } int(1) 

you put -movflags without specifying value before output file. thinks test.mp4 flag value hence problem.