Hello, pkgconfig is not installed on my computer. So aconfigure uses the pkgconfig.py script to find cflags and libs options. Unfortunately on Mac, the ffmpeg pkgconfig files define for Libs: -framework CoreFoundation -framework VideoDecodeAcceleration -framework QuartzCore And pkgconfig.py returns: -framework CoreFoundation VideoDecodeAcceleration QuartzCore Like you see, two "-framework" are missing. In conclusion, there is an error during the linking step. I don't know python, so I can't fix the issue myself quickly. Can someone do it ? Thanks Best regards Samuel