GUIDE: Grap the first 'x' seconds from a webm:

ffmpeg -i input.webm -ss 00:00:00 -t 00:00:0x -async 1 -c copy output.webm

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Guide: Transforming mp4 to webm on linux

ffmpeg -i <input.mp4> -c:v libvpx-vp9 -crf 30 -b:v 0 -b:a 128k -c:a libopus <output.webm>

Adjust -crf value to set quality. Lower value means higher quality at the cost of greater file size.

** Guide to Topic Visibility (Private vs. Public)

I define the content of a topic to consists of its posts, pinned posts, voice chats, and files.

** Public Topic:
Everything is visible to all users and everyone can post content

** Protected Topic:
Like a public topic everything is visible to all users, but only moderators can posts content.

** Private Topic:
The topic name and description remain public. However, the content is restricted to users with access. Only users who have been granted access can view the topic content.

Private topic access:
Moderators and guests invited by moderators. Moderators can grant or revoke guest access at their discretion. Moderators add additional moderators at their discretion.