[Libav-user] Some application statically link to Libav, without releasing itself in an object format to allow relinking?

[Carl Eugen Hoyos]

2018-02-28 11:19 GMT+01:00 Genghuang Wang <wangtianjiao.wang959 at gmail.com>:
> Hello
>
> I have found it which claims to be "source code" of the FFmpeg at
> http://dldir1.qq.com/weixin/android/FFmpegJNI.zip in
> http://www.wechat.com/en/source_code.html .
>
> After unzip it, I have found some static library in the path of
> \FFmpegJNI\FFmpegJNI\jni\ffmpeg\android\arm\lib\libavcodec.a ,and some
> other static libraries which are also part of Libav released under
> LGPL
>
> According to http://www.gnu.org/licenses/gpl-faq.html#LGPLStaticVsDynamic
>
> Does the LGPL have different requirements for statically vs
> dynamically linked modules with a covered work? (#LGPLStaticVsDynamic)
> For the purpose of complying with the LGPL (any extant version: v2, v2.1 or v3):
>
> (1) If you statically link against an LGPL'd library, you must also
> provide your application in an object (not necessarily source) format,
> so that a user has the opportunity to modify the library and relink
> the application.
>
> So the application statically link to libavcodec and some other LGPL
> libraries by FFmpeg, without releasing itself in an object format to
> allow relinking. If that is the case, maybe the application is
> breaking the license of LGPL which the FFmpeg releases in?

Many applications violate the copyright of FFmpeg developers,
it is very hard / impossible to do something against them.

Carl Eugen