cat numbered/*.jpg | ffmpeg -f image2pipe -vcodec mjpeg -i - output.mp4
ffmpeg version 0.8.3-4:0.8.3-0ubuntu0.12.04.1, Copyright (c) 2000-2012 the Libav developers
  built on Jun 12 2012 16:52:09 with gcc 4.6.3
*** THIS PROGRAM IS DEPRECATED ***
This program is only provided for compatibility and will be removed in a future release. Please use avconv instead.
[mjpeg @ 0x1c2cc80] only 8 bits/component accepted
[image2pipe @ 0x1c227c0] Estimating duration from bitrate, this may be inaccurate
Input #0, image2pipe, from 'pipe:':
  Duration: N/A, bitrate: N/A
    Stream #0.0: Video: mjpeg, yuvj422p, 160x120, 25 fps, 25 tbr, 25 tbn, 25 tbc
Incompatible pixel format 'yuvj422p' for codec 'mpeg4', auto-selecting format 'yuv420p'
[buffer @ 0x1c394e0] w:160 h:120 pixfmt:yuvj422p
[avsink @ 0x1c35260] auto-inserting filter 'auto-inserted scaler 0' between the filter 'src' and the filter 'out'
[scale @ 0x1c36f00] w:160 h:120 fmt:yuvj422p -> w:160 h:120 fmt:yuv420p flags:0x4
Output #0, mp4, to 'output.mp4':
  Metadata:
    encoder         : Lavf53.21.0
    Stream #0.0: Video: mpeg4, yuv420p, 160x120, q=2-31, 200 kb/s, 25 tbn, 25 tbc
Stream mapping:
  Stream #0.0 -> #0.0
Press ctrl-c to stop encoding
[mjpeg @ 0x1c2cc80] only 8 bits/component accepted
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    Last message repeated 32 times
frame=   65 fps=  0 q=2.0 Lsize=      38kB time=2.60 bitrate= 118.5kbits/s dup=32 drop=0
video:36kB audio:0kB global headers:0kB muxing overhead 3.594683%
andy@andy-quiet:~/Pictures/Kosnix-ZLamp/Z-LampAnimate1$