[gmic]-0./ Start G'MIC interpreter (in debug mode).
<gmic>-0./ Initial command line: '-cli_start -debug -w -average_video MOVI0001.mp4 -n 0,255 -o MOVI0001avg.jpg'.
<gmic>./ Decompose command line into 9 items: 
<gmic>./   item[0] = '-cli_start'
<gmic>./   item[1] = '-debug'
<gmic>./   item[2] = '-w'
<gmic>./   item[3] = '-average_video'
<gmic>./   item[4] = 'MOVI0001.mp4'
<gmic>./   item[5] = '-n'
<gmic>./   item[6] = '0,255'
<gmic>./   item[7] = '-o'
<gmic>./   item[8] = 'MOVI0001avg.jpg'

<gmic>-0./ Enter scope './'.
<gmic>-0./ Item '-cli_start', selection [].
<gmic>-0./ Found custom command 'cli_start: ' (takes no arguments).
<gmic>-0./ Expand command line for command 'cli_start' to: ''.
<gmic>-0./cli_start/ Return from empty function 'cli_start/'.
<gmic>-0./ Item '-debug', selection [].
<gmic>-0./ Item '-w', selection [].
<gmic>-0./ Command '-window': arguments = '-average_video'.
[gmic]-0./ Display image [] in 256x256 display window [0], with auto-normalization, no fullscreen and title '[G'MIC] Window #0'.
<gmic>-0./ Item '-average_video', selection [].
<gmic>-0./ Found custom command 'average_video: -check "isint(${2=0}) && $2>=0 && isint(${3=-1}) && ($3>=0 || $3==-1) && ${4=1}>=1" -skip "${5=}" -e[^-1] "Average frames of inp(...)t frame $2, last frame $3, frame step $4 and output filename '$5'.\n" -v - _N= -_average_stream[] "\"$1\",$frame",${2-4},"$5" -v +' (takes arguments).
<gmic>-0./ Command '-average_video': arguments = 'MOVI0001.mp4'.
<gmic>-0./ Found 1 given argument for command 'average_video':
<gmic>-0./   $1 = 'MOVI0001.mp4'
<gmic>-0./ Expand command line for command 'average_video' to: '-check "isint(0) && 0>=0 && isint(-1) && (-1>=0 || -1==-1) && 1>=1" -skip "" -e[^-1] "Average frames of input video file 'MOVI00(...)ame 0, last frame -1, frame step 1 and output filename ''.\n" -v - _N= -_average_stream[] "\"MOVI0001.mp4\",$frame",0,-1,1,"" -v +'.
<gmic>./ Decompose command line into 13 items: 
<gmic>./   item[0] = '-check'
<gmic>./   item[1] = 'isint(0) && 0>=0 && isint(-1) && (-1>=0 || -1==-1) && 1>=1'
<gmic>./   item[2] = '-skip'
<gmic>./   item[3] = ''
<gmic>./   item[4] = '-e[^-1]'
<gmic>./   item[5] = 'Average frames of input video file 'MOVI0001.mp4'\, with first frame 0\, last frame -1\, frame step 1 and output filename ''.\n'
<gmic>./   item[6] = '-v'
<gmic>./   item[7] = '-'
<gmic>./   item[8] = '_N='
<gmic>./   item[9] = '-_average_stream[]'
<gmic>./   item[10] = '\"MOVI0001.mp4\"\,\$frame,0,-1,1,'
<gmic>./   item[11] = '-v'
<gmic>./   item[12] = '+'

<gmic>-0./average_video/ Enter scope 'average_video/'.
<gmic>-0./average_video/ Item '-check', selection [].
<gmic>-0./average_video/ Command '-check': arguments = 'isint(0) && 0>=0 && isint(-1) && (-1>=0 || -1==-1) && 1>=1'.
[gmic]-0./average_video/ Check expression 'isint(0) && 0>=0 && isint(-1) && (-1>=0 || -1==-1) && 1>=1' -> true.
<gmic>-0./average_video/ Item '-skip', selection [].
<gmic>-0./average_video/ Command '-skip': arguments = ''.
[gmic]-0./average_video/ Skip argument ''.
<gmic>-0./average_video/ Item '-e[^-1]', selection [0].
<gmic>-0./average_video/ Command '-echo': arguments = 'Average frames of input video file 'MOVI0001.mp4'\, with first frame 0\, last frame -1\, frame step 1 and output filename ''.\n'.
[gmic]-0./ Average frames of input video file 'MOVI0001.mp4', with first frame 0, last frame -1, frame step 1 and output filename ''.

<gmic>-0./average_video/ Item '-v', selection [].
[gmic]-0./average_video/ Decrement verbosity level (set to -1).
<gmic>-0./average_video/ Item '_N=', selection [].
[gmic]-0./average_video/ Set global variable '_N='.
<gmic>-0./average_video/ Item '-_average_stream[]', selection [].
<gmic>-0./average_video/ Found custom command '_average_stream: -skip "${5=}" -is_ext "$5",avi is_outavi=${} frame=$2 i=0 go_on=1 N=0 imM=inf,-inf -do -l[] $1 -onfail go_on=0 -endl -if $go_on (...)-rm. -endif frame+=$4 -endif -while {$go_on" && "($3==-1" || "$frame<=$3)} -/ $N -c $imM -if $is_outavi -o[] "$5",25,mp4v,0 -endif' (takes arguments).
<gmic>-0./average_video/ Command '-_average_stream': arguments = '\"MOVI0001.mp4\"\,\$frame,0,-1,1,'.
<gmic>-0./average_video/ Found 4 given arguments for command '_average_stream':
<gmic>-0./average_video/   $1 = '\"MOVI0001.mp4\"\,\$frame'
<gmic>-0./average_video/   $2 = '0'
<gmic>-0./average_video/   $3 = '-1'
<gmic>-0./average_video/   $4 = '1'
<gmic>-0./average_video/ Expand command line for command '_average_stream' to: '-skip "" -is_ext "",avi is_outavi=${} frame=0 i=0 go_on=1 N=0 imM=inf,-inf -do -l[] "MOVI0001.mp4",$frame -onfail go_on=0 -endl (...)if -rm. -endif frame+=1 -endif -while {$go_on" && "(-1==-1" || "$frame<=-1)} -/ $N -c $imM -if $is_outavi -o[] "",25,mp4v,0 -endif'.
<gmic>./average_video/ Decompose command line into 99 items: 
<gmic>./average_video/   item[0] = '-skip'
<gmic>./average_video/   item[1] = ''
<gmic>./average_video/   item[2] = '-is_ext'
<gmic>./average_video/   item[3] = ',avi'
<gmic>./average_video/   item[4] = 'is_outavi=${}'
<gmic>./average_video/   item[5] = 'frame=0'
<gmic>./average_video/   item[6] = 'i=0'
<gmic>./average_video/   item[7] = 'go_on=1'
<gmic>./average_video/   item[8] = 'N=0'
<gmic>./average_video/   item[9] = 'imM=inf,-inf'
<gmic>./average_video/   item[10] = '-do'
<gmic>./average_video/   item[11] = '-l[]'
<gmic>./average_video/   item[12] = 'MOVI0001.mp4,$frame'
<gmic>./average_video/   item[13] = '-onfail'
<gmic>./average_video/   item[14] = 'go_on=0'
<gmic>./average_video/   item[15] = '-endl'
<gmic>./average_video/   item[16] = '-if'
<gmic>./average_video/   item[17] = '$go_on'
<gmic>./average_video/   item[18] = '-v'
<gmic>./average_video/   item[19] = '+'
<gmic>./average_video/   item[20] = '-e[]'
<gmic>./average_video/   item[21] = '\r  > Frame #$frame$_N        '
<gmic>./average_video/   item[22] = '-v'
<gmic>./average_video/   item[23] = '-'
<gmic>./average_video/   item[24] = 'imM={v=[$imM];[min(im,v[0]),max(iM,v[1])]}'
<gmic>./average_video/   item[25] = 'N+=1'
<gmic>./average_video/   item[26] = '-if'
<gmic>./average_video/   item[27] = '{$!>1}'
<gmic>./average_video/   item[28] = '-+'
<gmic>./average_video/   item[29] = '-endif'
<gmic>./average_video/   item[30] = '-if'
<gmic>./average_video/   item[31] = '{narg()}'
<gmic>./average_video/   item[32] = '--/.'
<gmic>./average_video/   item[33] = '$N'
<gmic>./average_video/   item[34] = '-c.'
<gmic>./average_video/   item[35] = '$imM'
<gmic>./average_video/   item[36] = '-if'
<gmic>./average_video/   item[37] = '$is_outavi'
<gmic>./average_video/   item[38] = '-z.'
<gmic>./average_video/   item[39] = '0,{w-(w%8)-1}'
<gmic>./average_video/   item[40] = '-o.'
<gmic>./average_video/   item[41] = ',25,mp4v,1'
<gmic>./average_video/   item[42] = '-else'
<gmic>./average_video/   item[43] = '-o.'
<gmic>./average_video/   item[44] = '${-filename ,$i}'
<gmic>./average_video/   item[45] = 'i+=1'
<gmic>./average_video/   item[46] = '-endif'
<gmic>./average_video/   item[47] = '-rm.'
<gmic>./average_video/   item[48] = '-endif'
<gmic>./average_video/   item[49] = '-if'
<gmic>./average_video/   item[50] = '{*}'
<gmic>./average_video/   item[51] = 'title=[G'MIC] Frame #$frame'
<gmic>./average_video/   item[52] = '--n'
<gmic>./average_video/   item[53] = '0,255'
<gmic>./average_video/   item[54] = '-if'
<gmic>./average_video/   item[55] = '{!narg($wh)}'
<gmic>./average_video/   item[56] = 'wh=${-fitscreen[] {w},{h}}'
<gmic>./average_video/   item[57] = '-w.'
<gmic>./average_video/   item[58] = '$wh,0,$title'
<gmic>./average_video/   item[59] = '-else'
<gmic>./average_video/   item[60] = '-w.'
<gmic>./average_video/   item[61] = '-1,-1,0,$title'
<gmic>./average_video/   item[62] = '-endif'
<gmic>./average_video/   item[63] = '-if'
<gmic>./average_video/   item[64] = '{({*,CTRLLEFT} || {*,CTRLRIGHT}) && {*,D}}'
<gmic>./average_video/   item[65] = '-w[]'
<gmic>./average_video/   item[66] = '{{*,w}*1.5},{{*,h}*1.5}'
<gmic>./average_video/   item[67] = '-wait'
<gmic>./average_video/   item[68] = '-1'
<gmic>./average_video/   item[69] = '-endif'
<gmic>./average_video/   item[70] = '-if'
<gmic>./average_video/   item[71] = '{({*,CTRLLEFT} || {*,CTRLRIGHT}) && {*,C}}'
<gmic>./average_video/   item[72] = '-w[]'
<gmic>./average_video/   item[73] = '{{*,w}/1.5},{{*,h}/1.5}'
<gmic>./average_video/   item[74] = '-wait'
<gmic>./average_video/   item[75] = '-1'
<gmic>./average_video/   item[76] = '-endif'
<gmic>./average_video/   item[77] = '-if'
<gmic>./average_video/   item[78] = '{({*,CTRLLEFT} || {*,CTRLRIGHT}) && {*,R}}'
<gmic>./average_video/   item[79] = '-w[]'
<gmic>./average_video/   item[80] = '{0,w},{0,h}'
<gmic>./average_video/   item[81] = '-wait'
<gmic>./average_video/   item[82] = '-1'
<gmic>./average_video/   item[83] = '-endif'
<gmic>./average_video/   item[84] = '-rm.'
<gmic>./average_video/   item[85] = '-endif'
<gmic>./average_video/   item[86] = 'frame+=1'
<gmic>./average_video/   item[87] = '-endif'
<gmic>./average_video/   item[88] = '-while'
<gmic>./average_video/   item[89] = '{$go_on && (-1==-1 || $frame<=-1)}'
<gmic>./average_video/   item[90] = '-/'
<gmic>./average_video/   item[91] = '$N'
<gmic>./average_video/   item[92] = '-c'
<gmic>./average_video/   item[93] = '$imM'
<gmic>./average_video/   item[94] = '-if'
<gmic>./average_video/   item[95] = '$is_outavi'
<gmic>./average_video/   item[96] = '-o[]'
<gmic>./average_video/   item[97] = ',25,mp4v,0'
<gmic>./average_video/   item[98] = '-endif'

<gmic>-0./average_video/_average_stream/ Enter scope '_average_stream/'.
<gmic>-0./average_video/_average_stream/ Item '-skip', selection [].
<gmic>-0./average_video/_average_stream/ Command '-skip': arguments = ''.
[gmic]-0./average_video/_average_stream/ Skip argument ''.
<gmic>-0./average_video/_average_stream/ Item '-is_ext', selection [].
<gmic>-0./average_video/_average_stream/ Found custom command 'is_ext: -skip "${1=}" -v - 0 -nm. "_$1" -u {"lowercase(['"{x}"'])==lowercase(['$2'])"} -rm. -v +' (takes arguments).
<gmic>-0./average_video/_average_stream/ Command '-is_ext': arguments = ',avi'.
<gmic>-0./average_video/_average_stream/ Found 2 given arguments for command 'is_ext':
<gmic>-0./average_video/_average_stream/   $1 = (undefined)
<gmic>-0./average_video/_average_stream/   $2 = 'avi'
<gmic>-0./average_video/_average_stream/ Expand command line for command 'is_ext' to: '-skip "" -v - 0 -nm. "_" -u {"lowercase(['"{x}"'])==lowercase(['avi'])"} -rm. -v +'.
<gmic>./average_video/_average_stream/ Decompose command line into 12 items: 
<gmic>./average_video/_average_stream/   item[0] = '-skip'
<gmic>./average_video/_average_stream/   item[1] = ''
<gmic>./average_video/_average_stream/   item[2] = '-v'
<gmic>./average_video/_average_stream/   item[3] = '-'
<gmic>./average_video/_average_stream/   item[4] = '0'
<gmic>./average_video/_average_stream/   item[5] = '-nm.'
<gmic>./average_video/_average_stream/   item[6] = '_'
<gmic>./average_video/_average_stream/   item[7] = '-u'
<gmic>./average_video/_average_stream/   item[8] = '{lowercase(['{x}'])==lowercase(['avi'])}'
<gmic>./average_video/_average_stream/   item[9] = '-rm.'
<gmic>./average_video/_average_stream/   item[10] = '-v'
<gmic>./average_video/_average_stream/   item[11] = '+'

<gmic>-0./average_video/_average_stream/is_ext/ Enter scope 'is_ext/'.
<gmic>-0./average_video/_average_stream/is_ext/ Item '-skip', selection [].
<gmic>-0./average_video/_average_stream/is_ext/ Command '-skip': arguments = ''.
[gmic]-0./average_video/_average_stream/is_ext/ Skip argument ''.
<gmic>-0./average_video/_average_stream/is_ext/ Item '-v', selection [].
[gmic]-0./average_video/_average_stream/is_ext/ Decrement verbosity level (set to -2).
<gmic>-0./average_video/_average_stream/is_ext/ Item '0', selection [].
<gmic>-0./average_video/_average_stream/is_ext/ Command '-input': arguments = '0'.
[gmic]-0./average_video/_average_stream/is_ext/ Input empty image at position 0 (1 image 0x0x0x0).
<gmic>-1./average_video/_average_stream/is_ext/ Item '-nm.', selection [0].
<gmic>-1./average_video/_average_stream/is_ext/ Command '-name': arguments = '_'.
[gmic]-1./average_video/_average_stream/is_ext/ Set name of image [0] to '_'.
<gmic>-1./average_video/_average_stream/is_ext/ Item '-u', selection [0].
<gmic>-1./average_video/_average_stream/is_ext/ Command '-status': arguments = '{lowercase(['{x}'])==lowercase(['avi'])}' -> '0'.
[gmic]-1./average_video/_average_stream/is_ext/ Set status to '0'.
<gmic>-1./average_video/_average_stream/is_ext/ Item '-rm.', selection [0].
[gmic]-1./average_video/_average_stream/is_ext/ Remove image [0] (0 images left).
<gmic>-0./average_video/_average_stream/is_ext/ Item '-v', selection [].
[gmic]-0./average_video/_average_stream/is_ext/ Increment verbosity level (set to -1).
<gmic>-0./average_video/_average_stream/is_ext/ Exit scope 'is_ext/'.

<gmic>-0./average_video/_average_stream/ Item 'is_outavi=${}' -> 'is_outavi=0', selection [].
[gmic]-0./average_video/_average_stream/ Set local variable 'is_outavi=0'.
<gmic>-0./average_video/_average_stream/ Item 'frame=0', selection [].
[gmic]-0./average_video/_average_stream/ Set local variable 'frame=0'.
<gmic>-0./average_video/_average_stream/ Item 'i=0', selection [].
[gmic]-0./average_video/_average_stream/ Set local variable 'i=0'.
<gmic>-0./average_video/_average_stream/ Item 'go_on=1', selection [].
[gmic]-0./average_video/_average_stream/ Set local variable 'go_on=1'.
<gmic>-0./average_video/_average_stream/ Item 'N=0', selection [].
[gmic]-0./average_video/_average_stream/ Set local variable 'N=0'.
<gmic>-0./average_video/_average_stream/ Item 'imM=inf,-inf', selection [].
[gmic]-0./average_video/_average_stream/ Set local variable 'imM=inf,-inf'.
<gmic>-0./average_video/_average_stream/ Item '-do', selection [].
[gmic]-0./average_video/_average_stream/*do/ Start 'do...while' block.
<gmic>-0./average_video/_average_stream/*do/ Item '-l[]', selection [].
[gmic]-0./average_video/_average_stream/*do/*local/ Start 'local...endlocal' block, with selected image [].

<gmic>-0./average_video/_average_stream/*do/*local/ Enter scope '*local/'.
<gmic>-0./average_video/_average_stream/*do/*local/ Item 'MOVI0001.mp4,$frame' -> 'MOVI0001.mp4,0', selection [].
<gmic>-0./average_video/_average_stream/*do/*local/ Command '-input': arguments = 'MOVI0001.mp4,0'.
[gmic]-0./average_video/_average_stream/*do/*local/ Input frame 0 of file 'MOVI0001.mp4' at position 0
[gmic]-0./average_video/_average_stream/*do/*local/ *** Error *** [instance(0,0,00000000)] CImgList<float>::load_video(): File 'MOVI0001.mp4', unable to detect format of video file.
[gmic]-0./average_video/_average_stream/*do/*local/ Reach '-onfail' block.

<gmic>-0./average_video/_average_stream/*do/*local/ Enter scope '*local/'.
<gmic>-0./average_video/_average_stream/*do/*local/ Item 'go_on=0', selection [].
[gmic]-0./average_video/_average_stream/*do/*local/ Set local variable 'go_on=0'.
<gmic>-0./average_video/_average_stream/*do/*local/ Item '-endl', selection [].
[gmic]-0./average_video/_average_stream/*do/*local/ End 'local...endlocal' block.
<gmic>-0./average_video/_average_stream/*do/*local/ Exit scope '*local/'.

<gmic>-0./average_video/_average_stream/*do/ Item '-if', selection [].
<gmic>-0./average_video/_average_stream/*do/ Command '-if': arguments = '$go_on' -> '0'.
[gmic]-0./average_video/_average_stream/*do/*if/ Start 'if...endif' block -> condition '0' does not hold.
<gmic>-0./average_video/_average_stream/*do/*if/ Item '-endif', selection [].
[gmic]-0./average_video/_average_stream/*do/*if/ End 'if...endif' block.
<gmic>-0./average_video/_average_stream/*do/ Item '-while', selection [].
<gmic>-0./average_video/_average_stream/*do/ Command '-while': arguments = '{$go_on && (-1==-1 || $frame<=-1)}' -> '0'.
[gmic]-0./average_video/_average_stream/*do/ Reach '-while' command -> condition '0' does not hold.
[gmic]-0./average_video/_average_stream/*do/ End 'do...while' block.
<gmic>-0./average_video/_average_stream/ Item '-/', selection [].
<gmic>-0./average_video/_average_stream/ Command '-div': arguments = '$N' -> '0'.
[gmic]-0./average_video/_average_stream/ Divide image [] by 0.
<gmic>-0./average_video/_average_stream/ Item '-c', selection [].
<gmic>-0./average_video/_average_stream/ Command '-cut': arguments = '$imM' -> 'inf,-inf'.
[gmic]-0./average_video/_average_stream/ Cut image [] in range [inf,-inf].
<gmic>-0./average_video/_average_stream/ Item '-if', selection [].
<gmic>-0./average_video/_average_stream/ Command '-if': arguments = '$is_outavi' -> '0'.
[gmic]-0./average_video/_average_stream/*if/ Start 'if...endif' block -> condition '0' does not hold.
<gmic>-0./average_video/_average_stream/*if/ Item '-endif', selection [].
[gmic]-0./average_video/_average_stream/*if/ End 'if...endif' block.
<gmic>-0./average_video/_average_stream/ Exit scope '_average_stream/'.

<gmic>-0./average_video/ Item '-v', selection [].
[gmic]-0./average_video/ Increment verbosity level (set to 0).
<gmic>-0./average_video/ Exit scope 'average_video/'.

<gmic>-0./ Item '-n', selection [].
<gmic>-0./ Command '-normalize': arguments = '0,255'.
[gmic]-0./ Normalize image [] in range [0,255].
<gmic>-0./ Item '-o', selection [].
<gmic>-0./ Command '-output': arguments = 'MOVI0001avg.jpg'.
[gmic]-0./ Output image [] as jpg file 'MOVI0001avg.jpg', with quality 100%.
[gmic]-0./ *** Error *** Command '-output': File 'MOVI0001avg.jpg', instance list (0,00000000) is empty.