I am hearing a thumping sound coming from the front end. I can feel it in the floor, not in the wheel - there is no shimmy. I just had the tires rotated as I was told that's what it was... that didn't help. if anyone has had this issue, can you give me suggestions as to what to have checked...

Here is a link to an audio/video https://www.youtube.com/watch?v=1Rwt2wO3c0Q&feature=youtu.be. This video is dark and meant to be more audio as I was searching for the source of the noise.The reason, an engine noise that recently devoloped at about 204k miles. The noise sounds simliar to a...