Fatal error in the transcoders settings page after updating

After updating to the last release I get the following error mesage in the transcoders page (admin/settings/video/transcoders):

Fatal error: Declaration of video_ffmpeg_wrapper::load_completed_job() must be compatible with that of transcoder_interface::load_completed_job() in /home/siti/tias/sites/all/modules/video/transcoders/video_ffmpeg_wrapper.inc on line 12

This issue seams somehow related to the ffmpeg_wrapper, that is currently disabled in my installation.

Thanks for your help,
Marco