I live in Europe where PAL is the de facto video standard with 25, 50 fps frame rate. I have my Canon set for either depending on the situation. When exporting the video in Lightroom, there's only 30 fps available. It forces me to use external video processing software in order to be able to have the same fps as the original footage. Why this limitation for all users living outside of the US?
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Lightroom only provides custom preset option to change the resolution of the exported video. You can try using Premiere pro if you need to change the frames per second of any video.