hello, i am getting a file conversion error. when i upload a flv video, it works fine and plays, but when any other format, the video fails to convert. here is a log of one of the mp4 file i tried to convert.
i tried some of the methods posted in other threads, but none worked.
any help would be appreciated. thanx.

2010-03-05 5:07:32 <h1>STARTING VIDEO CONVERSION (process_queue.id = 15)</h1>

2010-03-05 5:07:32 <p>File: /home/cmehire/public_html/video/14012010037_1.mp4</p>

2010-03-05 5:07:32 <p>$file_extn = mp4</p>

2010-03-05 5:07:32 <p>$re_process_vid = 0</p>

2010-03-05 5:07:32 <p>$rand_flv_name = 12677656502040159875.mp4</p>

2010-03-05 5:07:32 <hr /><p>sql</p><p>UPDATE `videos` SET `video_folder`='4ca4238a0b/' WHERE
`video_id`=15</p>

2010-03-05 5:07:32 <hr /><p>UPDATE `process_queue` SET
`vid`='15' WHERE
`id`='15'</p><hr />

2010-03-05 5:07:32 <p>Video id: 15</p>

2010-03-05 5:07:32 Video Output File Name : /home/cmehire/public_html/flvideo/4ca4238a0b/12677656502040159875.mp4

2010-03-05 5:07:32 <p>$video_flv = Video Output File Name : /home/cmehire/public_html/flvideo/4ca4238a0b/12677656502040159875.mp4</p>

2010-03-05 5:07:32 Find video duration - START

2010-03-05 5:07:32 <p>Bit Rate (ffmpeg-php): 561.423</p>

2010-03-05 5:07:32 <p>Duration (ffmpeg-php): 53.2</p>

2010-03-05 5:07:32 DURATION: 00:5320

2010-03-05 5:07:32 <h2>Create Thumbnail - START</h2>

2010-03-05 5:07:33 <p>Create Thumbnail with ffmpeg-php - END</p>

2010-03-05 5:07:33 <p>$cmd_convert_v = convert_mp4</p>

2010-03-05 5:07:33 <p>506 $cmd_convert = /usr/bin/ffmpeg -i '/home/cmehire/public_html/video/14012010037_1.mp4' -acodec libfaac -ab 96k -vcodec libx264 -vpre hq -crf 22 -threads 0 -b 561.423k /home/cmehire/public_html/flvideo/4ca4238a0b/12677656502040159875.mp4</p>

2010-03-05 5:07:33 <hr /><pre></pre><hr />

2010-03-05 5:07:33 <p>Return value: </p>

2010-03-05 5:07:33 <p>UPDATE `process_queue` SET
`status`='6' WHERE
`id`='15'</p>

2010-03-05 5:07:33 <p><b>ERROR: failed video conversion.</b></p>

2010-03-05 5:12:48 <h1>STARTING VIDEO CONVERSION (process_queue.id = 15)</h1>

2010-03-05 5:12:48 <p>File: /home/cmehire/public_html/video/14012010037_1.mp4</p>

2010-03-05 5:12:48 <p>$file_extn = mp4</p>

2010-03-05 5:12:48 <hr /><p>SELECT * FROM `videos` WHERE
`video_id`=15</p><hr />

2010-03-05 5:12:48 <p>Video id: 15</p>

2010-03-05 5:12:48 Video Output File Name : /home/cmehire/public_html/flvideo/4ca4238a0b/12677656502040159875.mp4

2010-03-05 5:12:48 <p>$video_flv = Video Output File Name : /home/cmehire/public_html/flvideo/4ca4238a0b/12677656502040159875.mp4</p>

2010-03-05 5:12:48 Find video duration - START

2010-03-05 5:12:48 <p>Bit Rate (ffmpeg-php): 561.423</p>

2010-03-05 5:12:48 <p>Duration (ffmpeg-php): 53.2</p>

2010-03-05 5:12:48 DURATION: 00:5320

2010-03-05 5:12:48 <h2>Create Thumbnail - START</h2>

2010-03-05 5:12:52 <p>Create Thumbnail with ffmpeg-php - END</p>

2010-03-05 5:12:52 <p>$cmd_convert_v = convert_mp4</p>

2010-03-05 5:12:52 <p>506 $cmd_convert = /usr/bin/ffmpeg -i '/home/cmehire/public_html/video/14012010037_1.mp4' -acodec libfaac -ab 96k -vcodec libx264 -vpre hq -crf 22 -threads 0 -b 561.423k /home/cmehire/public_html/flvideo/4ca4238a0b/12677656502040159875.mp4</p>

2010-03-05 5:12:53 <hr /><pre></pre><hr />

2010-03-05 5:12:53 <p>Return value: </p>

2010-03-05 5:12:53 <p>UPDATE `process_queue` SET
`status`='6' WHERE
`id`='15'</p>

2010-03-05 5:12:53 <p><b>ERROR: failed video conversion.</b></p>