I have a workflow I've been using for months - shoot with a gopro3, import the video, edit it, apply lens correction, sometimes adjust audio, then export it using a few presets. There's usually some resolution changes, e.g. from gopro 1440 wide (1920x1440) to 1080p or 720p, a few simple transitions, but rarely anything more. The video plays fine within premiere while editing.
Staring a couple of days ago export using presets I've used for months is very slow. Instead of exporting almost at real time (10 minutes to output 10 minutes of video), it's estimating 2-3 hours for a 10 minute video.
The workaround I've found is to disable lens correction. With the exact same project and timeline, same export preset, only change disabling the lens correction the export speed went back to normal.
The adobe components are up to date (I don't think I recently applied any updates to them).
Export from within premiere or queued to media encoder have the same effect.
I cleared the media cache.
I've restarted the system.
I have 16G of memory and usually using only 8-12 of it while exporting.
The imported video plays fine in windows explorer, and I'm using the same camera and recording settings I've used for a long time.
I even tried re-exporting a project from a week ago, and it was slow exporting today, although it exported normally a week ago.
One possible change - I recently installed bit defender total security. But disabling all modules and real-time protection it still exports slow with lens distortion enabled. (I haven't tried uninstalling bitdefender completely. Even though it seems strange to cause such a specific performance issue, that might be my next try.)
I don't have a lot of different video clips to test with. Most of mine is from a gopro 3 at 1920x1440, 29.97 fps.
I'm aware that when users say "but I didn't change anything" they almost always did... but I'm wracking my memory and can't think of anything other than installing bitdefender. There might have been a recent windows update as well. I'm on windows 10 pro and automatically installing updates as microsoft releases them.
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