[FFmpeg-devel] a potential licensing conflict in libavfilter

Michael Niedermayer michaelni at gmx.at
Sat Jul 2 11:46:55 CEST 2011

On Sat, Jul 02, 2011 at 02:00:40AM -0700, D M German wrote:
> hi everybody,
> I am a researcher who specializes in licensing of software (for example
> we have developed a licensing identification tool called ninka:
> http://ninka.turingmachine.org)
> My collaborators and I are currently trying to develop a tool to try to
> understand what sources are used to create a binary. We felt that ffmpeg
> was a good candidate to test our tool due to the fact that its binaries
> can be generated under different licenses (each with different
> contents).
> We compiled ffmpeg with the default parameters, and found that one file:
> libavfilter/x86/gradfun.c (GPLv2+) appears to be used to create the LGPL
> libavfilter library.

I suspect the header is wrong as:
    From: Loren Merritt <lorenm at u.washington.edu>
    To: FFmpeg development discussions and patches <ffmpeg-devel at mplayerhq.hu>
    Date: Wed, 1 Dec 2010 06:22:46 +0000 (UTC)
    Subject: Re: [FFmpeg-devel] [PATCH] Port gradfun to libavfilter (GCI)

    On Tue, 30 Nov 2010, Nolan L wrote:
    > Things that still need to be addressed (mostly with the asm):
    > -Factoring the asm; I don't have enough asm experience to do this.
    > -alignment issues with the asm code. (hopefully someone more
    >  experienced can take care of this.)
    > -gpl vs lgpl

    LGPL ok

Maybe loren (in CC) could clarify, and if lgpl is intended change the
header ?

Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

The greatest way to live with honor in this world is to be what we pretend
to be. -- Socrates
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