RK3399 qplayer播放4k30fps视频不流畅问题

rk3399 buildroot系统使用qplayer播放4k30fps视频不流畅，播放4k60fps视频直接绿屏，
以下是4k30fps打印的日志和硬解码时间，有了解的朋友回复一下，谢谢！

mpp803: mpp_info: mpp version: db750eff author: Herman Chen   2020-10-12 [mpi_enc_test]: Add encoder frame skip config
mpp803: mpp_rt: NOT found ion allocator
mpp803: mpp_rt: found drm allocator
[   52.882942] rk_vcodec: vpu_service_ioctl:2141: error: unknown vpu service ioctl cmd 40086c01
mpp803: mpp: deprecated block control, use timeout control instead
mpp803: h264d_api: is_avcC=1

[   86.940986] rk_vcodec: rkvdec task: 24 ms
[   86.978076] rk_vcodec: rkvdec task: 35 ms
[   86.995090] rk_vcodec: rkvdec task: 14 ms
[   87.021995] rk_vcodec: rkvdec task: 24 ms
[   87.061119] rk_vcodec: rkvdec task: 36 ms
[   87.077190] rk_vcodec: rkvdec task: 13 ms
[   87.113459] rk_vcodec: rkvdec task: 33 ms