### Describe the bug When ffmpeg is not installed you can launch videoclip creation but you should not be able to. ### Steps to reproduce 1. Do not install ffmpeg 2. Create a videoclip ### Expected behavior We should get a warning and not be able to launch the videoclip creation. ### Actual behavior Videoclip starts (but of course never gets done). ### Relevant logs and/or screenshots  ``` ErrorException: unlink(/home/cloudpanel/htdocs/cpod.podcastindex.net/writable/temp/episode-71-specs-and-spacs-6853.309-6885.491BhEXuf-soundbite.mp3): No such file or directory in /home/cloudpanel/htdocs/cpod.podcastindex.net/app/Libraries/MediaClipper/VideoClipper.php:195 Stack trace: #0 [internal function]: CodeIgniter\Debug\Exceptions->errorHandler() #1 /home/cloudpanel/htdocs/cpod.podcastindex.net/app/Libraries/MediaClipper/VideoClipper.php(195): unlink() #2 /home/cloudpanel/htdocs/cpod.podcastindex.net/app/Libraries/MediaClipper/VideoClipper.php(217): MediaClipper\VideoClipper->cleanTempFiles() #3 /home/cloudpanel/htdocs/cpod.podcastindex.net/modules/Admin/Controllers/SchedulerController.php(64): MediaClipper\VideoClipper->generate() #4 /home/cloudpanel/htdocs/cpod.podcastindex.net/vendor/codeigniter4/codeigniter4/system/CodeIgniter.php(825): Modules\Admin\Controllers\SchedulerController->generateVideoClips() #5 /home/cloudpanel/htdocs/cpod.podcastindex.net/vendor/codeigniter4/codeigniter4/system/CodeIgniter.php(412): CodeIgniter\CodeIgniter->runController() #6 /home/cloudpanel/htdocs/cpod.podcastindex.net/vendor/codeigniter4/codeigniter4/system/CodeIgniter.php(320): CodeIgniter\CodeIgniter->handleRequest() #7 /home/cloudpanel/htdocs/cpod.podcastindex.net/public/index.php(41): CodeIgniter\CodeIgniter->run() #8 {main} ``` ### Context - Castopod: beta-5 - OS: Debian 10 + CloudPanel - Browser: n/a - Web server: Nginx - ffmpeg not installed ### Possible fixes