Licenses

FrameFlow license

This open source project is LGPL license. But it actually doesn't matter. Because it is based on FFmpeg, which has two license, GPL or LGPL. Roughly speaking, GPL is stricter than LGPL. So if only you comply with these licenses. You also comply with FrameFlow license.

FFmpeg licenses

Now lets' talk about FFmpeg licenses. It may be confusing to you if you are not familiar with these licenses. I'll explain them in plain English.

GPL

If you use FFmpeg GPL license, you need to either open source your project or purchase a GPL commercial license for your proprietary software. And the most important point is, it is contagious. That means, any project contains GPL FFmpeg, also need to comply with this rule. So be careful about your usage.

LGPL

LGPL = Lesser GPL. So it only requires that, any modifications in FFmpeg library must be open source. But has no requirement of any codes outside its library, even for commecial use cases, for free.

How to avoid GPL

By default, this project releases GPL FFmpeg compiled wasm file. Because it contains most components and chooses best.

However, if you want to only use LGPL, then at current time, you need to build wasm file by yourself. Just remove --enable-gpl option in ./build_ffmpeg.sh. Create an issue if you have any questions.

Preparing multiple versions of wasm file would be the future work of this project.

By the way, these are my understanding of licenses. Please correct me if there are some mistakes.