one can find the diff code in the link as below for reference, but this code is based on the 3.14.28, for your kenel maybe you need to change something, and if you want to rotate video, one can use gstreamer too
Hi,Joan
thanks for answering me,how can I use gstreamer to achieve the rotation,can you give me a example?
Hi,Joan
I used the command as you said above , it still didn't work.thanks for your patience.