Conversion video MP4 pour PSP ac ffmpeg

Bonjour
J'utilise ffmpeg pour convertir des videos flv en mp4 pour la psp
Mais meme en utilisant les bon reglage la pssp firm 1.5 ne reconais pas les video( donnés non compatibles)

Les videos marchent tres bien sur mon portable sony Ericson

Voici la commande utilisé

"E:\ffmpeg.exe" -i bd_.flv -vcodec mpeg4 -b 717000 -s 368x208 -r 29.97 -aspect 16:9 -f mp4 -acodec aac -ar 24000 -ab 32000 "C:\MP_ROOT\100MNV01\M4V10012.MP4"

Voila la sortie

FFmpeg version SVN-r9017, Copyright (c) 2000-2007 Fabrice Bellard, et al.
configuration: --enable-memalign-hack --enable-pthreads --enable-libmp3lame --
enable-libogg --enable-libvorbis --enable-libtheora --enable-libamr-nb --enable-
libamr-wb --enable-libgsm --enable-libnut --enable-x264 --enable-gpl --enable-sw
scaler --enable-liba52 --enable-xvid --enable-libfaad --enable-libfaac --enable-
libdts --enable-avisynth --cpu=i686 --disable-shared --enable-static
libavutil version: 49.4.0
libavcodec version: 51.40.4
libavformat version: 51.12.1
built on May 13 2007 17:41:26, gcc: 4.1.2

Seems stream 0 codec frame rate differs from container frame rate: 1000.00 (1000
/1) -> 30.00 (30/1)
Input #0, flv, from 'bd_.flv':
Duration: 00:02:06.1, start: 0.000000, bitrate: 32 kb/s
Stream #0.0: Video: vp6f, yuv420p, 320x240, 30.00 fps(r)
Stream #0.1: Audio: mp3, 22050 Hz, mono, 32 kb/s
Output #0, mp4, to 'C:\MP_ROOT\100MNV01\M4V10013.MP4':
Stream #0.0: Video: mpeg4, yuv420p, 368x208, q=2-31, 717 kb/s, 29.97 fps(c)
Stream #0.1: Audio: aac, 24000 Hz, mono, 32 kb/s
Stream mapping:
Stream #0.0 -> #0.0
Stream #0.1 -> #0.1
Press [q] to stop encoding
frame= 1148 fps= 86 q=3.8 size= 3648kB time=38.1 bitrate= 783.5kbits/s


je comprend pas ce qui cloche car sa fonctionne tres bien avec mon portable...

Configuration: Windows XP
Firefox 2.0.0.5