Today I performed a benchmark test with lastest MediaCoder iPhone Edition (which has improved support for Intel MSDK), by transcoding the same 720p H.264 MKV file to a MP4 file of iPhone 4 profile, respectively with encoder of x264 (fast preset) and Intel MSDK (balanced preset). The two times of transcoding result in video with near visual quality. The difference in transcoding speed and CPU utilization is somehow significant. With x264 encoder, the CPU utilization is near 100% and the overall speed is about 3.4x (versus playback speed). With Intel MSDK encoder, the CPU utilization is near 50% and the overall speed is about 7.9x, which is 132% faster than using x264.