I found the docs re upload limits. https://docs.joinmastodon.org/user/posting/#attachments
40MB for video
The smaller the better as bandwidth and storage does cost me money.
Free Open Source Video Software
VidCutter - https://github.com/ozmartian/vidcutter
Handbrake - https://handbrake.fr/
VidCoder has option for setting filesize, I haven't used it so I can't verify.
If your comfortable with the command line FFMpeg can do anything
@derekered @cordobaMIII One additional tip in sharing videos-if you upload your video to Google Photos (as well as other cloud storage platforms I think), then "share" it you will be given the option to create a link that I believe you can copy to your clipboard and then paste here. This would allow you to share a video of yourself of any length at the highest possible resolution here. I plan to give this a test later on today so you'll know if this works soon. In other news, this is my cock...
I think a good rule of thumb would be, If video is under 5min and it's a vid you shot then upload here.
If you don't have ownership rights to the video or it's longer than 5min then link to it from another site.
This is a place where people who love penises can share their love with one another.