Obviously, I'm learning all the time, about the aspects of video.
So, I'm trying to learn how two MP4's, that I have, have the same recording, the same quality and the same time length, but are different file sizes? One file size is 3.9MB and the other is 13.6MB. I look forward to being enlightened. Thanks
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They are almost certainly not the same quality. Can you post an example?
Filesize = average bitrate * running time
If they are both have the same running time, the larger one has a higher bitrate (and likely higher quality, if everything else was the same)