Solution 2: Premiere Pro does not support H.264 in an AVI container. You can try disabling 'Enable accelerated Intel h.264 decoding' option in Media tab (preferences).
Solution 1: When you imported H.264 video to Premiere Pro for editing, Adobe Premiere Pro CC is very slow, lagging preview. Solutions to Fix 'Can't Import/Edit H.264 Video in Premiere Pro' Now, read on and find the best solution to solve the issues for you. So why can't people edit H.264 video in Premiere Pro smoothly? Reasons are various to cause the issues. In Premiere Pro supported media page, Premiere Pro supports various media that use H.264 encoding. Moreover, some can't import H.264 video to Premiere Pro. User' reports said that it's sometimes laggy and slow when eding H.264 video in Premiere Pro. But there is still trouble that happens when you importing H.264 video to Adobe Premiere Pro (CC, CS6, CS5, CS4). Normally, it is easy to import video to Premiere Pro (CC, CS6, CS5, CS4) for editing. Are you a user of Adobe Premiere Pro? As a timeline-based video editing software, Adobe Premiere Pro (CC, CS6, CS5, CS4) have massive fans.