Play the video from the specified time (seek)

[yunfengwangluo]

Thank you for taking the time to review my question!
I am learning ffmpeg next and successfully played video files during my studies. But there is a new problem troubling me, I tried using input. seek() to set the time. But this seems to be wrong, the running result does not meet expectations. At runtime, it has no errors but also does not work, and the video cannot start playing from the location I specified.
If you know how to do it, could you give me a simple example? Thank you again.