feat: clustered ffmpeg transcoding

[Soxasora]

Description

Clustered FFmpeg transcoding for video uploads

Proof-of-concept with Node and Express acting as a master server that queue transcoding jobs to be picked up by its defined workers.
It enables transcoding for video uploads streamlining compatibility across devices.

Screenshots

n/a

Additional Context

Transcoding requires some time and it can add a noticeable overhead on video uploads. The result video is a slimmed, color corrected mp4 file.

note: this is not a well-tested feature and nowhere near ready for production, I halted development on this to explore other solutions
note 2: this transcodes every video file to mp4, could also allow only video/quicktime mime type to act as a last-resort option

Checklist

Are your changes backwards compatible? Please answer below:
Doesn't interfere with video playback, it's a new step while uploading that only happens when the file is a video.

On a scale of 1-10 how well and how have you QA'd this change and any features it might affect? Please answer below:
5.
Tried with 4 workers and 8 simultaneous uploads, enqueueing correctly the jobs until workers were available.
An 18 MB 720p mov file was correctly transcoded to 13 MB 720p mp4 file.

For frontend changes: Tested on mobile, light and dark mode? Please answer below: n/a

Did you introduce any new environment variables? If so, call them out explicitly here:

# .env.development
# ffmpeg
NEXT_PUBLIC_FFMPEG_URL=http://localhost:3002
FFMPEG_PORT=3002
FFMPEG_WORKERS=4

[socket-security]

New dependencies detected. Learn more about Socket for GitHub ↗︎

Package	New capabilities	Transitives	Size	Publisher
npm/[email protected]	filesystem Transitive: environment	+17	456 kB	linusu

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