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configure: error: Missing header file ffmpeg/avcodec.h.
How do i fix this?

I have installed ffmpeg code, bur still break at here.

My kernel is 2.6.9-11.EL, RHEL4

Did you tell VLC's configure the exact location of your compiled ffmpeg-source or where you installed it? Have a look at ./configure --help. There are 2 options which let you do that.
Additionally, make sure that you are using a rather recent ffmpeg-snapshot (but not after July 30 -- these don't work with 0.8.2! That's fixed in our development trunk though). Otherwise, you might encounter further configure-errors.

I meet the same problem, can you tell me how to tell vlc configure the ffmpeg path? thank you very much.

It's like ./configure --help says: --with-ffmpeg-config-path=PATH ffmpeg-config path (default search in \$PATH) or --with-ffmpeg-tree=PATH ffmpeg tree for static linking

But it still doesn't work, I specified the ffmpeg path,
my ffmpeg version is ffmpeg-0.4.9-pre1
and I extract ffmpeg under /root, so I set the path to be /root/ffmpeg-0.4.9-pre1/libavcodec,
is it right?

thank you for your reply.

ok, this problem is OK now.

another problem:

I configured vlc with command: ./configure --disable-wxwindows --disable-skins2

and then compile.

but there are errors occured while compiling smb.c,
error information such as:
parse error before "SMBCCTX"

how can I do for this problem?

OK, it work, I upgraded the smb.
thank you.

As far as I remember, it has to be /root/ffmpeg-0.4.9-pre1/ in your situation, if you are specifying the location of the compiled ffmpeg-source.