These open source software packages are used and tested by Drastic Technologies, but cannot be directly supported as Drastic software. In either case, full source for the modules is provided here. For most products, this requires a separate install provided below, but for non encoding products like DrasticPreview and DrasticPreview Pro, LGPL DLLs are also included in the installer. Compile FFmpeg without '-enable-gpl' and withoutĢ.Drastic Technologies software does not contain any open source software, but can and does make use of some open source software to enhance its operation and add features such as WebM, Mkv, DNxHD, ProRes, and AVCi. FFmpeg does not hold these patents and therefore cannot licenses these to me.įinally and for reference, FFmpeg publishes a decent FAQ including a 'License Compliance Checklist': its first two items are the most important wrt building an LGPL-configured FFmpeg: 1. This involves possibly contacting several patent holders such as Mpeg-LA and can be a long and painful process. This needs to be reviewed codec-by-codec and I would handle this with the assistance of a lawyer. More details on dependencies and licensing are explained here.Īs an aside, irrespective of the resulting (and verified) license of a certain configuration of FFmpeg, I need to consider eventual patent licenses for using certain codecs for some purposes, in particular if I project to use this in a commercial software product. The simple rule I apply is that the copyleft of the GPL flows up to my code when I build or use code that depends on GPL-licensed code (at least when linking is at play). This configuration process is not guaranteed to be foolproof and I should check for any third-party codecs I depend on (for instance by inspecting the generated config or by checking the required shared objects in the build Elfs using readelf) and checking their actual license terms. And if there is no GPL-licensed extensions, FFmpeg declares it self as LGPL-licensed. The same applies for built-in extensions that would be subject to the GPL.

When I configure FFmpeg to use third-party codecs that are GPL-licensed, then FFmpeg 'declares' itself as GPL-licensed as a result of activating these configuration options, either GPL 2 or GPL 3 depending on the third-party codecs. Are these embedded codecs ok to use in my application to keep it LGPL compliant? These are third party codecs so probably won't be the same LGPL licence.

Ffmpeg windows lgpl