[FFmpeg-devel] [PATCH] faq: explain dependency problems with static libs.

Michael Niedermayer michaelni at gmx.at
Wed Jul 11 12:43:09 CEST 2012

On Wed, Jul 11, 2012 at 12:02:33PM +0200, Nicolas George wrote:
> Signed-off-by: Nicolas George <nicolas.george at normalesup.org>
> ---
>  doc/faq.texi |   11 +++++++++++
>  1 file changed, 11 insertions(+)
> diff --git a/doc/faq.texi b/doc/faq.texi
> index da44adb..f9e0be0 100644
> --- a/doc/faq.texi
> +++ b/doc/faq.texi
> @@ -383,6 +383,17 @@ Yes, as long as the code is optional and can easily and cleanly be placed
>  under #if CONFIG_GPL without breaking anything. So, for example, a new codec
>  or filter would be OK under GPL while a bug fix to LGPL code would not.
> + at section I'm using FFmpeg from within my C application but the linker complains about missing symbols from the libraries themselves.
> +
> +FFmpeg builds static libraries by default. In static libraries, dependencies
> +are not handled. That has two consequences. First, you must specify the
> +libraries in dependency order: @code{-lavdevice} must come before
> + at code{-lavformat}, @code{-lavutil} must come after everything else, etc.
> +Second, external libraries that are used in FFmpeg have to be specified too.
> +
> +The easy way to get the full list of required libraries in dependency order
> +is to use @code{pkg-config}.

maybe an example gcc command line with pkg-config could be added

otherwise LGTM


Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

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