Reduce size of mp4 video

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I have an mp4 file but it is huge and I want to reduce the size.
I can't use MovieMaker because it treats it as an audio (Vista).
If I rename to mpg it complains about codec missing.
How can I reduce the size and keep quality good?
I can use linux (e.g. from a Mac) if there is an appropriate tool or Windows 7

Jim

Posted 2016-07-11T19:58:53.163

Reputation: 521

How big is the file right now, and how long is the runtime? Is it a raw file or has it already been encoded once. You can try re-encoding with Handbrake, but quality will suffer. – CConard96 – 2016-07-11T20:06:14.373

@CConard96:It is 1.5GB and is ~40mins. What is a "raw file"? – Jim – 2016-07-11T20:07:12.693

By raw, I meant uncompressed. Assuming the resolution is 1080p, that size seems about what I get when I record before I notice quality loss. – CConard96 – 2016-07-11T20:12:00.373

@CConard96:Yes uncompressed. How can I reduce the size? – Jim – 2016-07-12T03:52:54.377

Answers

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The best open source application I have found for taking an existing AVI or MP4 and compressing it is AVIDemux. Open the file, select the video output, and change to a smaller bitrate. You will probably need to read the man pages or a tutorial to learn your way around but it is worth it.

MrMoxy

Posted 2016-07-11T19:58:53.163

Reputation: 111

Asked: 2016-07-11T19:58:53.163

Viewed: 381 times

Active: 2016-07-20T05:53:50.167