FFMpeg Output

[root@srv1 1330031941993]# ffmpeg -y -loop 1 -i lena.pnm -vcodec mjpeg -vframes 100 out.mov
ffmpeg version 0.10 Copyright (c) 2000-2012 the FFmpeg developers
  built on Mar 13 2012 20:50:02 with gcc 4.1.2 20080704 (Red Hat 4.1.2-51)
  configuration:
  libavutil      51. 34.101 / 51. 34.101
  libavcodec     53. 60.100 / 53. 60.100
  libavformat    53. 31.100 / 53. 31.100
  libavdevice    53.  4.100 / 53.  4.100
  libavfilter     2. 60.100 /  2. 60.100
  libswscale      2.  1.100 /  2.  1.100
  libswresample   0.  6.100 /  0.  6.100
Input #0, image2, from 'lena.pnm':
  Duration: 00:00:00.04, start: 0.000000, bitrate: N/A
    Stream #0:0: Video: ppm, rgb24, 256x256, 25 fps, 25 tbr, 25 tbn, 25 tbc
Incompatible pixel format 'rgb24' for codec 'mjpeg', auto-selecting format 'yuvj420p'
[buffer @ 0xa6a14c0] w:256 h:256 pixfmt:rgb24 tb:1/1000000 sar:0/1 sws_param:
[buffersink @ 0xa6a1580] auto-inserting filter 'auto-inserted scale 0' between the filter 'src' and the filter 'out'
[scale @ 0xa69dc60] w:256 h:256 fmt:rgb24 -> w:256 h:256 fmt:yuvj420p flags:0x4
Output #0, mov, to 'out.mov':
  Metadata:
    encoder         : Lavf53.31.100
    Stream #0:0: Video: mjpeg (jpeg / 0x6765706A), yuvj420p, 256x256, q=2-31, 200 kb/s, 25 tbn, 25 tbc
Stream mapping:
  Stream #0:0 -> #0:0 (ppm -> mjpeg)
Press [q] to stop, [?] for help
frame=  100 fps=  0 q=24.8 Lsize=     474kB time=00:00:04.00 bitrate= 971.6kbits/s
video:473kB audio:0kB global headers:0kB muxing overhead 0.230244%