Great summary of x264 settings and SSIM
I really liked this post as it covered both the high level as well as diving down into the details of what you should be doing with x264 encoding for both file based and linear
Capturing output from stderr on ffmpeg
A look at how best to capture output from ffmpeg uing Python which can be a complex activity.
Ffmpeg the swiss army knife
Great list of ffmpeg commands including some advanced features like HLS segmentation