It's able to convert all H.264 files to Adobe Premiere Pro more compatible MPEG-2 video without losing quality. It is an easy-to-use yet professional H.264 encoder for Mac. Brorsoft Video Converter for Mac is the recommended utility to fulfill the task. So, in order to load and edit H.264 files in Premiere Pro, the first thing you need to do is to transcode H.264 to Premiere supported video formats.
Generally speaking, Adobe Premiere accepts video files in MPEG-2, DV-AVI, QuickTime MOV, etc format. Fortunately, we've figured out the solution for importing H.264 to Adobe Premiere Pro CC/CS6/CS5/CS4 for editing flawlessly. However, when you're trying to import the H.264 video, you only find that the H.264 files are not supported by Premiere Pro(even the latest Premiere Pro CC).
You may get some video files encoded in H.264 and need to add these H.264 files to Adobe Premiere Pro for editing. How to Import H.264 to Adobe Premiere Pro for Further Editing