[gmane.comp.video.ffmpeg.devel] [PATCH] dynload for libfaac

Mark Shuttleworth mark at ubuntu.com
Tue Mar 2 16:18:33 GMT 2010

On 02/03/10 12:13, Reinhard Tartler wrote:
> On Di, Mar 02, 2010 at 09:40:10 (CET), Mark Shuttleworth wrote:
>> Do they build independently of one another? I.e. does libfaac know about
>> ffmpeg at all? 
> no. libfaac is built completely independently of ffmpeg, and does not
> reference or otherwise use libavcodec.
> libfaac provides a very slim API consisting of only 6 functions. the
> file libavcodec/libfaac.c wraps these 6 functions in a way that the rest
> of the ffmpeg infrastructure can use it.
> Moreover, upstream is working on an independent aac implementation, with
> slow progress.
>> And can the patched version of ffmpeg build and run without libfaac at
>> all?
> yes, only the header faac.h is required at build time. ( Although I
> imagine it can be stripped down to a minimum.) At runtime, libavcodec is
> fully useable without faac, but can use its additional functionality
> (encoding to aac) if libfaac.so is found.

It sounds to me like there is no derivative work relationship between
the problematic piece, and ffmpeg. Is that true?

We have a good relationship with SFLC, we could approach them ourselves
and ask them to review the situation. But I'd be happier to do that if
we were confident that we're on the right side of the facts.


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