root@YNS:/home/denis# ffmpeg -i
ffmpeg version 2.5 Copyright (c) 2000-2014 the FFmpeg developers
built on Dec 7 2014 00:03:31 with gcc 4.9.1 (Ubuntu 4.9.1-16ubuntu6)
configuration: --disable-yasm
libavutil 54. 15.100 / 54. 15.100
libavcodec 56. 13.100 / 56. 13.100
libavformat 56. 15.102 / 56. 15.102
libavdevice 56. 3.100 / 56. 3.100
libavfilter 5. 2.103 / 5. 2.103
libswscale 3. 1.101 / 3. 1.101
libswresample 1. 1.100 / 1. 1.100
Missing argument for option 'i'.
Error splitting the argument list: Invalid argument