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I have a lot of mp4 videos files that together they make a movie I search after a free software that will combain all the mp4 videos files to one file that run all the files in the order so if any one here know about software like this I will glad to know that

I have a video of 12 hours that take 150 GB and I want to change the format of the video and the others parameter that the video will take only 1 GB (this is the best) or maximum will take 3 to 4 GB also in all the 12 hours video there is a background sound like wind that I want to remove How I...