On playback of "JitteryVideo.000.mpg" sample video is jittery, like frames are being dropped

On converting "JitteryVideo.000.mpg" sample to avi, video is recorded in slow motion

$ ffmpeg -i "C:\Media\MPG\JitteryVideo.000.mpg" "C:\JitteryVideo.000.avi"
FFmpeg version UNKNOWN, Copyright (c) 2000-2008 Fabrice Bellard, et al.
  configuration: --enable-shared --disable-static --enable-memalign-hack --enable-w32threads
  libavutil version: 49.7.0
  libavcodec version: 51.57.2
  libavformat version: 52.16.0
  libavdevice version: 52.0.0
  built on Sep 16 2008 11:43:38, gcc: 4.2.1-sjlj (mingw32-2)
  Duration: 00:00:03.23, start: 0.750000, bitrate: 


Stream mapping:
  Stream #0.0 -> #0.0
  Stream #0.1 -> #0.1
Press [q] to stop encoding
[mpeg2video @ 6BEA0820]00 motion_type at 28 17=1.68 bitrate= 834.7kbits/s    
[mpeg2video @ 6BEA0820]Warning MVs not available
[mpeg2video @ 6BEA0820]concealing 0 DC, 0 AC, 0 MV errors
frame=  194 fps=188 q=16.9 Lsize=     425kB time=3.24 bitrate=1075.0kbits/s    
video:297kB audio:25kB global headers:0kB muxing overhead 31.937163%