I was using the exec command to generate thumbnails via ffmpeg.. My method was:
exec("ffmpeg -f image2 -i /home/phedra/imgs/image/img%03d.png -r 12 -s 610x489 /home/phedra/imgs/video/out.avi", $out);
but my senior team member told me that using exec command is not a good practice because it is a dangerous command and It may harm server.. So find any other technique.. I struggled alot but didnt find any comprehensive method other than this.. Can anybody tell me anyother way to generate thumbnail from video using php class from scratch (With an example if possible), so that I could understand completely, Moreover also tell me the library link to download and settings for server if any setting needed to be done before using that technque(My server system is based on Ubuntu and the framework for developement is codeignitter)..
(Third party api tool for generating thumbnail is also welcome but the necessary thing is that it must be free:))