问题
I would like to append several video files from the camera through mp4parser. Unfortunately, in the same fragment, despite the fact that I try to change the OrientationHint of the media recorder when changing camera, only the first one seems to work (ie. if I start with the front camera, the videos with the back camera are reversed and vice versa).
To solve this problem, I tried to rotate the video that are in the wrong direction and that works (with the method of setMatrix mp4parser, the new files are in good direction). But when I want to append the files, (all in the right direction) I get the same result as if I had not rotated the videos, as if it could have only one orientation videos for my final component video.
Do you have a solution for this?
Thanks
来源：https://stackoverflow.com/questions/23764889/rotate-and-append-videos-with-mp4parser