title: How to trim video exactly at the middle of Iframe using Mp4Parser?
body: <p>I'm trying to use Mp4Parser to trim video in my Android app. But problem is: I can not cut exactly at position which I want. For example: if I choose position of trimming is the 5th second, the video is still the same as before cutting. I understand that: the reason is that: my Iframe is from 0 to 10th second. But how to solve this problem?</p>