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I am working on video compression techniques and was trying to segment the video into important and unimportant parts.

Unimportant parts are stored in 30 fps and important parts of the video are stored in 60fps.

So is it possible to store the parts of the video in different frame rates in a single file?

I have seen documents that the MP4 container supports variable frame rate but not sure how to add metadata to video so that the video is stored/played back at different fps based on the segment.

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