ffmpeg help error: Cannot allocate temp picture, check pix fmt

[superwormy]

I thought maybe someone could help me with an ffmpeg error. The error is:
"picture size invalid (0x0)
Cannot allocate temp picture, check pix fmt"

The command I'm running is:
ffmpeg -i file.mpg -ar 22050 out.flv

I'm trying to convert MPEGs to FLV so I can stream them on the web. Complete output is below... any idea what I can do to fix these kinds of errors? Most files work, its just a couple of them that are giving me problems...

Thanks!



FFmpeg version SVN-r9606, Copyright (c) 2000-2007 Fabrice Bellard, et al.
configuration: --cc=cc --prefix=/usr/local --make=gmake --disable-debug --enable-memalign-hack --enable-shared --enable-pp --extra-cflags=-O2 -fno-strict-aliasing -pipe -I/usr/local/include --extra-ldflag
s=-L/usr/local/lib --extra-libs=-pthread --enable-gpl --enable-pthreads --enable-liba52 --enable-liba52bin --enable-libfaac --enable-libfaad --enable-libfaadbin --disable-mmx --enable-libmp3lame --enable-lib
ogg --disable-ffplay --enable-libtheora --enable-libvorbis --enable-libx264 --enable-libxvid
libavutil version: 49.4.1
libavcodec version: 51.40.4
libavformat version: 51.12.1
built on Aug 23 2007 08:58:19, gcc: 3.4.6 [FreeBSD] 20060305

Seems stream 1 codec frame rate differs from container frame rate: inf (1/0) -> nan (0/0)
Input #0, mpeg, from '/file.mpg':
Duration: 00:05:52.3, start: 0.354656, bitrate: 435 kb/s
Stream #0.0[0x1c0]: Audio: mp2, 48000 Hz, stereo, 192 kb/s
Stream #0.1[0x1e0]: Video: mpeg2video, inf fps(c)
picture size invalid (0x0)
Cannot allocate temp picture, check pix fmt