18.104.22.168.3316 22.214.171.124.3325 Tested these two drivers. With both drivers lookahead fails with both Handbrake and QSTranscode. All other bitrate modes work fine. The cause is libmfxhw64.dll/libmfxhw32.dll from driver 3316 and 3325. By replacing it with dll's from driver builds 3308 or earlier Lookahead is working again. Looks like something is wrong in 3316 and 3325, or is it intended for whatever reason? Is there a fix planned?
For more complete information about compiler optimizations, see our Optimization Notice.