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I have a series of videos in mkv format that I need to stitch together into one longer video. The videos are also a little slow; halving the number of frames to save disk space and speed it up would be nice too.

I can manage this with a couple apps I have, but it's a multi-step process, and I haven't been able to speed it up. Is there a program that could do this in one step?

Running Mac OS.

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