ffmpeg-ac
Intel Core i7-4700MQ testing with a Dell 0W7R2C v01 and Intel HD 4600 2048MB on Ubuntu 14.04 via the Phoronix Test Suite.
HTML result view exported from: https://openbenchmarking.org/result/1606220-SO-FFMPEGAC380.
FFmpeg
H.264 HD To NTSC DV
Phoronix Test Suite v10.8.4