[BUG]: Linux build is forced to take precompiled ffmpeg binaries about vita3k

[Macdu]

Prebuilt ffmpeg binaries were being used ever since Vita3K was release. It's just that previously the prebuilt were directly in the github repository (which was pretty bad) while now only the appropriate prebuilt is being downloaded when cmake is first run.

Also it's not like you have no idea how the prebuilts were generated, all of them are automatically generated on each new update by a CI and the code run on the CI to generate the libraries is available on the github repository.

[v-fox]

Also it's not like you have no idea how the prebuilts were generated, all of them are automatically generated on each new update by a CI and the code run on the CI to generate the libraries is available on the github repository.

Open-source is not ran on faith, it's ran on open source and there is no source. This downgrades whole project in effectively "proprietary freeware". Also, GPL requires you to publish all source used.

and the code run on the CI to generate the libraries is available on the github repository.

1. I don't know where it supposed to be, but it doesn't seem to be in external/ffmpeg or Vita3K/ffmpeg-core/tree/master.
2. Even if it was tucked somewhere and formal GPL requirement met, it's still horrible maintenance and disrespect to intent of GPL.

[KhoraLee]

I don't know where it supposed to be, but it doesn't seem to be in external/ffmpeg or Vita3K/ffmpeg-core/tree/master.

1. VCPKG downloads ffmpeg code from ffmpeg's github mirror and apply patches. You can see how it is built at Github action's log.
   Patches: https://github.com/microsoft/vcpkg/tree/f6a5d4e8eb7476b8d7fc12a56dff300c1c986131/ports/ffmpeg
   Build log: https://github.com/Vita3K/ffmpeg-core/actions/runs/8255509666/job/22582128158

2. ffmpeg is LGPL v2.1 not GPL since we do not pass --enable-gpl build option.

3. Other OSS project uses such prebuilt library download process. For example IINA uses MPV(contains dynamic ffmpeg libraries) and download prebuilts from their private server (https://github.com/iina/iina?tab=readme-ov-file#using-the-pre-compiled-libraries). Also I don't get any difference with using package manager to download other libraries like OpenSSL.