I'm using a php script that uses a convertor.php file in the process of uploading flv and mpeg files. My uploads don't presently show up in the Uploads folder. So I looked at the log folder and saw this:

Command was executed. See rest of log for output details MEncoder SVN-r28690-3.4.6 (C) 2000-2009 MPlayer Team
get_path("config") problem
Option lavfopts: Unknown suboption i_certify_that_my_video_stream_does_not_use_b_frames
Error parsing option on the command line: -lavfopts

Exiting... (error parsing command line)

can someone help me determine how to resolve this upload issue?