11 [ "$video_size" != "" ] && video_size="-s "$video_size
13 if [ "$video_type" == "v4l" ]
14 then ffmpeg -vd "$video_file" -r $video_fps $video_size -f imagepipe -f yuv4mpegpipe -
15 else ffmpeg -i "$video_file" -ss $video_position -f imagepipe -r $video_fps $video_size -f yuv4mpegpipe -