Add libfdk_aac encoders option with Seal ffmpeg

[erickmufath]

Checklist

• [ ] This feature I'm requesting is already implemented in yt-dlp.
• [ ] This feature is merely a UI/UX update.
• [ ] This feature is suitable for primary users with little knowledge about yt-dlp.
• [X] This feature is available for most websites, not only the video platform I use.
• [X] This feature is suitable for a large variety of videos.
• [X] This feature is not going to conflict with many of the existing options.

Is your feature request related to a problem? Please describe.

I am a custom command user, when downloading a video I will use --postprocessor-args to change the audio format and codec first before merging it with the video, but after trying it, it seems that the libfdk_aac option is not available here, aac alone is not enough, also i want to use HE-AAC profile and more than just LC.

Describe the solution you'd like

Add or integrate encoders to ffmpeg Seal. I know libfdk_aac cannot come with prebuilt ffmpeg (read this : https://gist.github.com/ScribbleGhost/54ad17da006e8bba4a1612bd6a64571c), so can you integrate it with Seal?

Video link

No response

Additional context

[hewiofhiowa]

the libfdkaac encoders have some sort of copyright so it might not be allowed to use them