4K iPhone Video Lagging in Premiere Pro 2021

Question

Hi!

I recently shot vertical video in 4K on my iPhone and brought it into premiere 2021. I can't even play one clip on my timeline without it lagging. It's to the point I'm not able to even edit it cause I can barely make out what I'm doing.

I tried creating proxies but it warped the footage, cleared my media cache, reduced the amount of memory, brought the preview down to 1/8, tried on multiple computers but nothing is working.

Any help would be appreciated! Thank you!

Peru Bob · Accepted Answer

Please use the free MediaInfo and post a screenshot the properties of your media in tree view:
https://mediaarea.net/en/MediaInfo

Many users are having issues with VFR. If the file is variable frame rate, use Hand brake to convert to constant frame rate:
https://handbrake.fr/downloads.php
Here is a tutorial:
https://www.youtube.com/watch?time_continue=34&v=xlvxgVREX-Y

Steve Griffiths · Answer

Unless you are using an iPhone 13 Pro and specifically recording in Prores format your iPhone recordings are using the HEVC/H.265 codec. While providing great video compression and quality it is not an 'editing friendly' format and will tax even higher powered computers.

Converting the footage to another (edit friendly) format prior to editing should make editing smoother. Though, depending on your computer and drive speed is still 4 times as 'taxing' as HD.

Try importing your footage into Media Encoder and converting to Prores.

Or as Peru Bob suggests - try Handbrake to convert.

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