You are zoomed out to 12.5%, which means your comp is a tiny speck in space.
Set resolution to AUTO, reveal all modified properties of the layers under the CTI (current time indicator) by selecting them and pressing the U key twice and start turning things off or resetting values to find problems. If that doesn't work why the odd composition size? 638 X 1164 does not match any standard video size? I would recommend a standard composition size and frame rate. Pick one that matches the video that you are using in the comp. If the video is not standard size then you need to know why, where it came from, and if AE will properly decode the video. What is the source of the MP4 file in the comp? Does the MP4 show up in the footage panel if you double click the source in the Project Panel? Is your AE up to date? There are a lot of funky artifacts in the composition panel between the timeline and the Comp Panel. What's going on here?
If answering those questions for yourself does not fix the problem then we need workflow and asset details.