I've been trying to downsize a video file of 400mb to 200mg. Everytime I compressed the video, the length of time is cut in half. Please help.
What editor are you using? Video editors allow you to save in a variety of formats and sizes. It shouldn't change the length of the video, just the resolution.
Try a product called Handbrake. It is free to use and allows videos to be converted to meet most peoples needs.
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