> Another issue was regarding FFMPEG and m3u8’s open source licenses and dealing with the possibility of a sudden license change.

I'm not quite sure I follow there. Any existing code's license wouldn't be able to be changed. Contributors could agree to let their contributions be licensed under a dual/new/different license going forward but it won't just close up on you. This is also not something that would happen suddenly. FFmpeg has no CLA that do things like copyright assignment so changing the license would require approval from all contributors. Open source licenses is exactly what allows you to reuse, share and build on top of each other's expertise. If you want to develop your own implementation fine, but this argument seems rather weak to me.