This question keeps coming up. There are many “half answers” posted on-line. I call them “half answers” because they ass-u-me you have already built Qt from source or have some other expert level knowledge. Here are the instructions for the hapless schmoe. First you have to “find” the source. This isn’t quite as easy as it sounds. You need to visit the official releases site for Qt. Then you need to select the version you … Qt 5.4 and MP4Read more