I also need the answer. This comment of Mr. Devid Kempers is not the official comment of the ffmpeg licenser. (right?) Therefore, I doubt that starting FFmpeg.exe might correspond to the following matters.

But if the semantics of the communication are intimate enough, exchanging complex internal data structures, that too could be a basis to consider the two parts as combined into a larger program.

Please give an official answer from FFmpeg licensers? Please my best regards.

From: David Kempers Date: Mon, 21 Dec 2009 11:09:56 +0000 To: FFmpeg user questions and RTFMs Subject: Re: [FFmpeg-user] Right steps to avoid violation FFMPEG license On Thu, Dec 17, 2009 at 10:10 PM, john burt <john.burt32@???> wrote:

...

Hi all,

After reading the L(GPL) license and some posts regarding it , I think that I know what steps I should follow to avoid the violation of the license. But, just some little questions are still unsolved.

My case is : I am developing software with privative license. I invoke FFMPEG.exe through command-line,so no linked libraries. My plans are :

- Include FFMPEG (exe and source) in my app installer. - Include GPL license text in the installer

My doubts are :

- Must I include my application source code ?

No. See here for more details, especially the last paragraph for the FAQ

http://www.gnu.org/licenses/gpl-faq.html#MereAggregation