My source stream:

[root@FFMPEG1 ~]# nc -l -u 5000 > video.test
Hangup
[root@FFMPEG1 ~]# ffprobe video.test
ffprobe version 0.10.4 Copyright (c) 2007-2012 the FFmpeg developers
  built on Jun 13 2012 09:51:06 with gcc 4.7.0 20120507 (Red Hat 4.7.0-5)
  configuration: --prefix=/usr --bindir=/usr/bin --datadir=/usr/share/ffmpeg --incdir=/usr/include/ffmpeg --libdir=/usr/lib64 --mandir=/usr/share/man --arch=x86_64 --extra-cflags='-O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector --param=ssp-buffer-size=4 -m64 -mtune=generic' --enable-bzlib --disable-crystalhd --enable-gnutls --enable-libass --enable-libcdio --enable-libcelt --enable-libdc1394 --disable-indev=jack --enable-libfreetype --enable-libgsm --enable-libmp3lame --enable-openal --enable-libopenjpeg --enable-libpulse --enable-librtmp --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-libvorbis --enable-libv4l2 --enable-libvpx --enable-libx264 --enable-libxvid --enable-x11grab --enable-avfilter --enable-postproc --enable-pthreads --disable-static --enable-shared --enable-gpl --disable-debug --disable-stripping --shlibdir=/usr/lib64 --enable-runtime-cpudetect
  libavutil      51. 35.100 / 51. 35.100
  libavcodec     53. 61.100 / 53. 61.100
  libavformat    53. 32.100 / 53. 32.100
  libavdevice    53.  4.100 / 53.  4.100
  libavfilter     2. 61.100 /  2. 61.100
  libswscale      2.  1.100 /  2.  1.100
  libswresample   0.  6.100 /  0.  6.100
  libpostproc    52.  0.100 / 52.  0.100
[mpeg2video @ 0x1c1a620] mpeg_decode_postinit() failure
    Last message repeated 9 times
[mpegts @ 0x1c16ae0] max_analyze_duration 5000000 reached at 5016000
[mpegts @ 0x1c16ae0] PES packet size mismatch
    Last message repeated 1 times
Input #0, mpegts, from 'video.test':
  Duration: 00:00:21.05, start: 66144.693722, bitrate: 6338 kb/s
  Program 1
    Stream #0:0[0x44]: Video: mpeg2video (Main) ([2][0][0][0] / 0x0002), yuv420p, 720x480 [SAR 8:9 DAR 4:3], 8000 kb/s, 31.67 fps, 29.97 tbr, 90k tbn, 59.94 tbc
    Stream #0:1[0x45]: Audio: mp2 ([3][0][0][0] / 0x0003), 48000 Hz, stereo, s16, 224 kb/s