下面是在cmd上显示的信息，有大神知道原因么

C:\Windows\system32>G:\ffmpeg\ffmpeg.exe -i G:\无限极管道的故事网商韩平[高清版].
mp4 -y -f image2 -t 0.001 -s 640x370 G:\222.jpg
FFmpeg version SVN-r25512, Copyright (c) 2000-2010 the FFmpeg developers
built on Oct 18 2010 04:06:45 with gcc 4.4.2
configuration: --enable-gpl --enable-version3 --enable-libgsm --enable-pthread
s --enable-libvorbis --enable-libtheora --enable-libspeex --enable-libmp3lame --
enable-libopenjpeg --enable-libschroedinger --enable-libopencore_amrwb --enable-
libopencore_amrnb --enable-libvpx --arch=x86 --enable-runtime-cpudetect --enable
-libxvid --enable-libx264 --extra-libs='-lx264 -lpthread' --enable-librtmp --ext
ra-libs='-lrtmp -lpolarssl -lws2_32 -lwinmm' --target-os=mingw32 --enable-avisyn
th --cross-prefix=i686-mingw32- --cc='ccache i686-mingw32-gcc' --enable-memalign
-hack
libavutil 50.32. 3 / 50.32. 3
libavcore 0. 9. 1 / 0. 9. 1
libavcodec 52.92. 0 / 52.92. 0
libavformat 52.83. 0 / 52.83. 0
libavdevice 52. 2. 2 / 52. 2. 2
libavfilter 1.52. 0 / 1.52. 0
libswscale 0.12. 0 / 0.12. 0
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'G:\无限极管道的故事网商韩平[高清版].mp4
':
Metadata:
major_brand : isom
minor_version : 1
compatible_brands: isom
Duration: 00:19:45.93, start: 0.000000, bitrate: 465 kb/s
Stream #0.0(und): Video: h264, yuv420p, 480x352, 399 kb/s, 15 fps, 15 tbr, 9
0k tbn, 30 tbc
Stream #0.1(eng): Audio: aac, 44100 Hz, stereo, s16, 63 kb/s
[buffer @ 01981700] w:480 h:352 pixfmt:yuv420p
[scale @ 01977f20] w:480 h:352 fmt:yuv420p -> w:640 h:370 fmt:yuvj420p flags:0x4

Output #0, image2, to 'G:\222.jpg':
Metadata:
encoder : Lavf52.83.0
Stream #0.0(und): Video: mjpeg, yuvj420p, 640x370, q=2-31, 200 kb/s, 90k tbn
, 15 tbc
Stream mapping:
Stream #0.0 -> #0.0
Press [q] to stop encoding
frame= 0 fps= 0 q=0.0 Lsize= -0kB time=10000000000.00 bitrate= -0.0kbi
ts/s
video:0kB audio:0kB global headers:0kB muxing overhead -inf%