Premiere Pro MP4 'Unsupported format' fix for iPhone videos

Quick answer

Transcode the iPhone MP4 from HEVC (H.265) to H.264 using Adobe Media Encoder or HandBrake. That fixes the 'Unsupported format or damaged file' error in all Premiere Pro versions.

Why this happens

Starting with the iPhone 7 and iOS 11, Apple switched to HEVC (H.265) for video recording. It's more efficient — smaller files at the same quality. But Premiere Pro, especially versions before 2023, struggles with H.265. The error isn't that the file is actually damaged. It's that Premiere can't decode the video stream. You'll see this most often when you record a 4K 60fps clip on your iPhone 14 Pro and then drag it straight into a project. Same thing happens with screen recordings from newer iPhones.

The main fix: Transcode to H.264

You've got two solid options. Both work. Pick the one you already have installed.

Option A: Use Adobe Media Encoder (you already have it)

1. Open Adobe Media Encoder. It's in the same Creative Cloud folder as Premiere Pro.
2. Click the + Add Source button in the top left. Browse to your iPhone MP4 file and select it.
3. In the queue, click the blue text under Preset. A dropdown opens.
4. Go to Broadcast > H.264 > Match Source – High Bitrate. Don't pick 'YouTube' or 'Vimeo' presets — they crop your frame.
5. Click Output File on the right. Save the new file somewhere you'll find it. I put mine in a _Transcoded folder inside the project folder.
6. Click the green Start Queue button (top right).
7. Wait for the job to finish. You'll see a green checkmark next to it.

After this, you can import the new H.264 file into Premiere Pro. It will work. No error.

Option B: Use HandBrake (free, no Adobe account needed)

1. Download HandBrake from handbrake.fr. Install it.
2. Open HandBrake. Click Open Source and select your iPhone MP4.
3. Under Summary tab, make sure Format is set to MP4.
4. Click the Video tab. Set Video Encoder to H.264 (x264). Keep Framerate at Same as Source.
5. Under Quality, set Constant Quality to 22. That's a good balance between file size and quality.
6. Click Browse at the bottom to choose where to save the file. Give it a name ending in .mp4.
7. Click the green Start Encode button at the top.
8. Wait. It takes about 2-4x the video length. A 10-minute clip takes 20-40 minutes.

HandBrake is my go-to when I'm on a client's machine that doesn't have Adobe. It's dead simple.

If the main fix doesn't work

Sometimes even the transcoded file gives the same error. Two less common things to try:

Check your Premiere Pro version

Premiere Pro 23.2 and later added official H.265 support for Intel and AMD GPUs. If you're on a Mac with Apple silicon (M1, M2, M3), Premiere Pro 24.0 handles HEVC natively. Update your app through Creative Cloud. Then import the original iPhone file directly. No transcode needed.

Rename the file extension

This is a long shot, but it costs you zero time. Right-click the iPhone MP4, choose Rename, and change the extension from .mp4 to .m4v. Premiere Pro sometimes reads M4V containers better. It's a five-second test.

How to avoid this going forward

Set your iPhone to record in H.264 instead of HEVC. Go to Settings > Camera > Formats. Select Most Compatible instead of High Efficiency. That changes the default codec to H.264. The files will be larger, but they'll import into any video editor without a fight.

If you're shooting 4K 60fps or ProRes, you're stuck with HEVC — there's no switch for those. In that case, build a habit of dropping your video into Media Encoder first. I keep an 'Inbox' watch folder in Media Encoder that automatically transcodes anything that lands in it. Saves me from forgetting.