The problem appears to be the transcoding speed, 17 fps is not fast enough to play the file while transcoding on the fly. Please try pre-transcoding http://www.mezzmo.com/wiki/doku.php?id=pre-transcoding_files&s[]=pre&s[]=transcoding the file and this should resolve the issue. You can also investigate ways to speed up transcoding by looking into the Performance Settings http://www.mezzmo.com/wiki/doku.php?id=reduce_video_stuttering&s[]=performance&s[]=settings#transcoding_performance or Hardware transcoding http://www.mezzmo.com/wiki/doku.php?id=hardware_transcoding&s[]=hardware