Rails using ffmpeg to make a screenshot of a video
<p>I want to use ffmpeg to make a screenshot of a uploaded video.</p>

<p>What I do is: uploading a video with carrierwave to amazonS3
when or while it is uploading I want to make a screenshot as thumbnail for this video.</p>

<p>How can I make this? How can I call ffmpeg with rails? </p>

<p>Thanks for your help</p>