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How can I interplote a 30FPS video to a 50 FPS video without affecting the length of the video?

I have used the VSDC video editor to do so. I have set the reframing mode to optical flow. However, I found that it just inserted a previous frame between the adjacent frames.

I have tried the mkvtoolnix, unfortunately, it just shortened the video duration.

Is there any better solution?

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Several commercial solutions seem only to support full integers as multipliers for frame rate conversion. Assuming VSDC works a similar way, thus you might try to go via the LCM of 30 and 50 frames per second and first do a upconversion to 150 frames/sec and afterwards reduce it to 50 frames/sec. Sadly the official docs do not say anything about that.

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