added check for ffmpeg

workflow/process_episode.bash

@@ -91,7 +91,7 @@ function program_checks() {
     done
   }
 
-  is_installed audio2image.bash awk base64 cat csvtojson curl date detox eval extract_images ffprobe file find grep head jq kate magick mediainfo mv realpath remove-image.pl rsync seamonkey sed sed sort sponge ssh touch touch wget hpr-check-ccdn-links
+  is_installed audio2image.bash awk base64 cat csvtojson curl date detox eval extract_images ffprobe ffmpeg file find grep head jq kate magick mediainfo mv realpath remove-image.pl rsync seamonkey sed sed sort sponge ssh touch touch wget hpr-check-ccdn-links
 
   for arg in $*
   do