Hi On a 36-core machine (Intel(R) Xeon(R) Platinum 8124M CPU @ 3.00GHz) with a 7 minute 125 Mbit/s 1080p sample and -thread_type frame -threads 36 this brings CPU utilization from 117% to 3174%, 58x realtime Without -threads 36 the utilization is only 1601% due to it being 16 by default.. /Tomas