Avoid direct H.264 exports from After Effects. Instead, render to a high-quality format (like Apple ProRes or DNxHD) and convert to .mp4 later.
Ensure composition dimensions (width and height) are even numbers (not odd). Comp 1.mp4
Writing with exporter: H.264. Writing to file: \\?\ C:\Users\rolenzj\Desktop\Comp 1.mp4. Writing file type: H264. Around timecode: Avoid direct H