Linux＆C：如何在录制mp4文件时在多进程程序中设置文件读取优先级

Question

This is for an assignment I'm not looking for you to suggest me the answer. I just need someone to point me in the right direction, maybe with a line or two of sample code.

I need to figure out how to set the priority of a recording mp4 files within my program. To the point:

i am trying to record from three cameras (1-HD and 2 analog cameras) at the same time and creating its tar file after each recording of duration 60seconds.

so after a set of records completed, i am taring those files. in doing that i am experiencing frame skip in only HD camera, remain 2 analog cameras are fine.hence forth i decided to set high priority for recording and low priority for taring those files.

please suggest me some ideas to set the priority, that neglect the frame skip.

Any help/guidance is appreciated :)

Answer 1

You will probably struggle to do this using the standard round robin time sharing scheduler in Linux. One approach could be to use the "real-time" scheduler policies for the video encoding threads, and tar the files in a thread using the standard scheduler. See sched_setscheduler .