请问3588用当前的ffmpeg编码4kp60的nv12数据成h264，cpu消耗很高，把一个核占满了，但用是mpp_enc_test 测试编码消耗的cpu不到%4，这个怎么解决？ #234
Description
ffmpeg -f v4l2 -i /dev/video1 -c:v h264_rkmpp -b:v 20M -g 60 -r 60 -y output_auto.h264
top - 09:26:11 up 31 min, 4 users, load average: 0.17, 0.09, 0.05
Tasks: 300 total, 1 running, 299 sleeping, 0 stopped, 0 zombie
%Cpu(s): 14.0 us, 2.3 sy, 0.0 ni, 83.7 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0 st
MiB Mem : 3842.8 total, 50.1 free, 3199.4 used, 593.2 buff/cache
MiB Swap: 0.0 total, 0.0 free, 0.0 used. 126.2 avail Mem
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
3707 forlinx 20 0 862020 185016 123168 S 127.5 4.7 0:09.59 ffmpeg
3604 forlinx 20 0 10208 3368 2484 R 2.0 0.1 0:14.28 top
2655 forlinx 20 0 19312 4988 2552 S 1.0 0.1 0:00.34 sshd
2803 forlinx 20 0 62.4g 887100 17520 S 1.0 22.5 0:23.54 node
3521 root 20 0 0 0 0 I 1.0 0.0 0:00.32 kworker/u16:2-devfreq_wq
1 root 20 0 167160 10772 7056 S 0.0 0.3 0:02.06 systemd
2 root 20 0 0 0 0 S 0.0 0.0 0:00.01 kthreadd
3 root 0 -20 0 0 0 I 0.0 0.0 0:00.00 rcu_gp
4 root 0 -20 0 0 0 I 0.0 0.0 0:00.00 rcu_par_gp
7 root 20 0 0 0 0 I 0.0 0.0 0:00.47 kworker/u16:0-events_power_efficient
8 root 0 -20 0 0 0 I 0.0 0.0 0:00.00 mm_percpu_wq
9 root 20 0 0 0 0 S 0.0 0.0 0:00.00 rcu_tasks_rude_
10 root 20 0 0 0 0 S 0.0 0.0 0:00.00 rcu_tasks_trace
11 root 20 0 0 0 0 S 0.0 0.0 0:00.04 ksoftirqd/0
12 root 20 0 0 0 0 I 0.0 0.0 0:00.47 rcu_sched
这个是不是没正常启动硬件编码吗？ 或者有什么工具可以看看是否正常启动了硬件编码吗？