blank video after upload

Hallo,
I have two vshare sites, in the same server (vps): one is working fine (2.4) and the other has a problem: when I upload the video the flash player is blank. In templates_c/debug.txt I have this message. Could you help me to solve the problem?

Code:

2007-11-16 17:29:24 Upload Finished 2007-11-16 17:29:24 Video (7) Conversion starting... 2007-11-16 17:29:24 File: /home/windsurf/public_html/video/kitesurf-amici.wmv 2007-11-16 17:29:24 ------------------------------------------------------------- 2007-11-16 17:29:24 INSERT INTO video SET UID='2', title='Volare via col kite', description='Kite vicino all\'aeroporto', keyword='volare,spot', channel='0|2|0', addtime='1195252164', adddate='2007-11-16', vkey='521960210', type='public', active='0', approve='1' 2007-11-16 17:29:24 ------------------------------------------------------------- 2007-11-16 17:29:24 Video id: 6 2007-11-16 17:29:24 Calling ffmpeg-php -> ffmpeg_movie() 2007-11-16 17:29:25 Get video duration - START 2007-11-16 17:29:25 Get video duration - END 2007-11-16 17:29:25 DURATION: 46.656 2007-11-16 17:29:25 Create Thumbnail - START 2007-11-16 17:29:32 Create Thumbnail - END 2007-11-16 17:29:32 CONVERT COMMAND: /usr/bin/mencoder '/home/windsurf/public_html/video/kitesurf-amici.wmv' -o /home/windsurf/public_html/flvideo/11952521721915548514.flv -of lavf -oac mp3lame -lameopts abr:br=56 -ovc lavc -lavcopts vcodec=flv:vbitrate=500:mbd=2:mv0:trell:v4mv:cbp:last_pred=3 -srate 22050 -ofps 24 -vf harddup 2007-11-16 17:29:45 ------------------------------------------------------------- 2007-11-16 17:29:45 MEncoder 1.0rc1-3.4.6 (C) 2000-2006 MPlayer Team CPU: Intel(R) Xeon(TM) CPU 3.00GHz (Family: 15, Model: 6, Stepping: 4) CPUflags: Type: 15 MMX: 1 MMX2: 1 3DNow: 0 3DNow2: 0 SSE: 1 SSE2: 1 Compiled with runtime CPU detection. success: format: 0 data: 0x0 - 0x1b4775 ASF file format detected. VIDEO: [WMV3] 320x240 24bpp 25.000 fps 0.0 kbps ( 0.0 kbyte/s) [V] filefmt:6 fourcc:0x33564D57 size:320x240 fps:25.00 ftime:=0.0400 ========================================================================== Opening audio decoder: [ffmpeg] FFmpeg/libavcodec audio decoders AUDIO: 32000 Hz, 2 ch, s16le, 32.0 kbit/3.12% (ratio: 4000->128000) Selected audio codec: [ffwmav2] afm: ffmpeg (DivX audio v2 (FFmpeg)) ========================================================================== Exiting... 2007-11-16 17:29:45 ------------------------------------------------------------- 2007-11-16 17:29:45 Return value: Exiting... 2007-11-16 17:29:45 File Size too small : 0 Bytes, Upload a big video. 2007-11-16 17:29:45 Calling process_video[7,0] 2007-11-16 17:52:21 Upload Finished 2007-11-16 17:52:21 Video (8) Conversion starting... 2007-11-16 17:52:21 File: /home/windsurf/public_html/video/kitesurf-amici_1.wmv 2007-11-16 17:52:21 ------------------------------------------------------------- 2007-11-16 17:52:21 INSERT INTO video SET UID='2', title='Volare via col kite', description='pericoli kite', keyword='pericoli,spot', channel='0|2|0', addtime='1195253541', adddate='2007-11-16', vkey='371882202', type='public', active='0', approve='1' 2007-11-16 17:52:21 ------------------------------------------------------------- 2007-11-16 17:52:21 Video id: 7 2007-11-16 17:52:21 Calling ffmpeg-php -> ffmpeg_movie() 2007-11-16 17:52:21 Get video duration - START 2007-11-16 17:52:21 Get video duration - END 2007-11-16 17:52:21 DURATION: 46.656 2007-11-16 17:52:21 Create Thumbnail - START 2007-11-16 17:52:26 Create Thumbnail - END 2007-11-16 17:52:26 CONVERT COMMAND: /usr/bin/mencoder '/home/windsurf/public_html/video/kitesurf-amici_1.wmv' -o /home/windsurf/public_html/flvideo/11952535461602832135.flv -of lavf -oac mp3lame -lameopts abr:br=56 -ovc lavc -lavcopts vcodec=flv:vbitrate=500:mbd=2:mv0:trell:v4mv:cbp:last_pred=3 -srate 22050 -ofps 24 -vf harddup 2007-11-16 17:52:30 ------------------------------------------------------------- 2007-11-16 17:52:30 MEncoder 1.0rc1-3.4.6 (C) 2000-2006 MPlayer Team CPU: Intel(R) Xeon(TM) CPU 3.00GHz (Family: 15, Model: 6, Stepping: 4) CPUflags: Type: 15 MMX: 1 MMX2: 1 3DNow: 0 3DNow2: 0 SSE: 1 SSE2: 1 Compiled with runtime CPU detection. success: format: 0 data: 0x0 - 0x1b4775 ASF file format detected. VIDEO: [WMV3] 320x240 24bpp 25.000 fps 0.0 kbps ( 0.0 kbyte/s) [V] filefmt:6 fourcc:0x33564D57 size:320x240 fps:25.00 ftime:=0.0400 ========================================================================== Opening audio decoder: [ffmpeg] FFmpeg/libavcodec audio decoders AUDIO: 32000 Hz, 2 ch, s16le, 32.0 kbit/3.12% (ratio: 4000->128000) Selected audio codec: [ffwmav2] afm: ffmpeg (DivX audio v2 (FFmpeg)) ========================================================================== Exiting... 2007-11-16 17:52:30 ------------------------------------------------------------- 2007-11-16 17:52:30 Return value: Exiting... 2007-11-16 17:52:30 File Size too small : 0 Bytes, Upload a big video. 2007-11-16 17:52:30 Calling process_video[8,0]

Thanks