you might try doubling that given that your file size is 33megs, but I assume that once its uploaded something is trying to either convert or compress the file similar to the way wordpress does when you upload a file.
128megs was enough for me on my system when uploading up to a 15 meg jpg image so you might need a little more..
Sounds like poor coding to myself, a good script would not require excessive use of memory. You could try increasing it to 512MB as a test, though, not something I would highly recommend.
██ l Dedigeeks (Twitter) • Shared • Reseller • Cloud VPS • Since 2010
██ l Leading AU Hosting Provider • Multiple locations - around the globe!
██ l cPanel/WHM • R1Soft Backups • 24/7/365 Support • 99.9% Uptime Guarantee
██ l www.yourcompanynamehere.com • Customer Service Rep. • Superior Service Guarantee