ffmpeg cannot open decoder (MPEG4-Video)?

[MacZero]

hello,
I'm trying to stream videos via vlc to my set top box (dbox) but I get troubles.

versions:
- ffmpeg-0.4.8
- vlc-0.8.4

I compiled ffmpeg with:

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./configure --enable-gpl --enable-mp3lame --enable-pp --enable-vorbis --enable-a52

and vlc with:

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./configure --disable-x11 --disable-xvideo --disable-gtk --disable-sdl --enable-ffmpeg --with-ffmpeg-mp3lame --disable-mad --enable-libdvbpsi --enable-a52 --enable-dts --enable-libmpeg2 --enable-dvdnav --enable-faad --enable-vorbis --enable-ogg --enable-theora --enable-faac --enable-mkv --disable-qt --disable-livedotcom --disable-wxwidgets --disable-ncurses --enable-release --with-ffmpeg-tree=/tmp/ffmpeg --disable-gui --disable-skins2 --disable-skins --disable-kde --disable-qt --enable-dvbpsi

The problem seems to be:

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. . [00000520] ffmpeg decoder debug: postprocessing disabled picture size invalid (0x640) [00000520] ffmpeg decoder error: cannot open codec (MPEG-4 Video) [00000520] ffmpeg decoder debug: libavcodec initialized (interface 3347968 ) . .

I really have no idea. I'm using debian and the needed libavcodec libaries are installed.

Maybe someone has an idea and can help me?