SOLVED
I used text file for inserting space
between characters in ffmpeg command. As the direct space was not working as i said in question.
So build a text file text.txt
. The contents will be the text you want on your video.
Then build the command like this :
"-i "+path+"out.mp4 -vf drawtext=fontfile="+path+"f1.ttf:textfile="+path+"text.ttf -y -c:v libx264 -c:a copy -movflags +faststart "+path+"output.mp4"
It will get run successfully.
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solved FFMPEG : Adding font to Video gives error