I've attached a simple source that, given the name of a video file, will print 
the first 10 frames (as ppm).
To compile you'll need the following packages installed:
libavcodec-dev
Compile with:
g++ ./avcodec_sample.cpp -o av_sample -g -pthread  -lavcodec -lavformat 
-lswscale

example use:
./av_sample ./my.video.ogv

On Ubuntu 9.10 x86-64 all video streams (vob,mov,mpg,mpg3,mpg4,wmv,...)
are ok but not if Theora coded.

** Attachment added: "Simple applet to use libavcodec functions to print first 
10 frames of a video file"
   http://launchpadlibrarian.net/39358431/avcodec_sample.cpp

-- 
libavcodec doesn't decode Theora
https://bugs.launchpad.net/bugs/522812
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