>>79296 (OP)If possible, could a moderator (or whoever creates the next thread) add this info to the OP?
First of all, if you have a .mp4 file, you can use a command similar to this one to turn it into a .webm:
ffmpeg -i input.mp4 -c:v libvpx-vp9 -crf 30 -b:v 0 -b:a 128k -c:a libopus output.webm
CRF stands for constant bitrate, adjusting that value lets you lower the filesize at the cost of some quality loss. Secondly, if you find it too hard to lower the filesize to something of acceptable quality, you can just upload it to services like anonfiles.com and files.catbox.moe and then repost the links in this thread.
If it's stuff that you're getting off of sites that keep multiple file formats (i.e. youtube), you can also use yt-dlp with the -F (or --list-formats) options to pick .webm and the appropriate file size.
Occasionally, you might try and upload a file and it will fail, that's probably because some header information is not working right with the specific settings of this imageboard, so you'll have to run this command on the file to strip metadata:
ffmpeg -i input.webm -c copy -map_metadata -1 output.webm
Vid related (spoiler as it's inflation) was 1.1 MBs as .mp4 and got reduced without much loss in quality.