关于rtsp硬解码问题

板子信息：RK3399Pro fedora28 python3.6.8  rknn-toolkit-v1.2.0
opencv_get_NetCamera.py脚本内容：
import cv2
print(cv2.__version__)
cap = cv2.VideoCapture("rtsp://username:password@192.168.3.25/H.264/ch1/sub/av_stream")#h265
ret, frame = cap.read()
while ret:
    ret, frame = cap.read()
    if not ret:
        continue
cv2.imshow("frame0",frame)
    if cv2.waitKey(1) & 0xFF == ord('q'):
        break
cv2.destroyAllWindows()打开terminal执行如下：[toybrick@toybrick Camera]$ python3 opencv_get_NetCamera.py
3.4.1
VIDEOIO ERROR: V4L: device rtsp://username:password@192.168.3.25/H.264/ch1/sub/av_stream: Unable to query number of channels
mpi: mpp version: Without VCS info
mpp_rt: NOT found ion allocator
mpp_rt: found drm allocator
mpp: deprecated block control, use timeout control instead
warning: GStreamer: unable to query duration of stream (/builddir/build/BUILD/opencv-3.4.1/modules/videoio/src/cap_gstreamer.cpp:904)
warning: Cannot query video position: status=1 value=0 duration=-1
(/builddir/build/BUILD/opencv-3.4.1/modules/videoio/src/cap_gstreamer.cpp:952)

我另外开了一个terminal 运行dmesg，显示了很杂乱的信息，如下：
pinstate
[    3.056467] ov9750.pltfrm_camera_module_get_data WARN: could not get sleep pinstate
[    3.058617] of_get_named_gpiod_flags: parsed 'rockchip,pd-gpio' property of node '/i2c@ff110000/camera-module@10[0]' - status (0)
[    3.058624] of_get_named_gpiod_flags: can't parse 'rockchip,pwr-gpio' property of node '/i2c@ff110000/camera-module@10[0]'
[    3.058630] of_get_named_gpiod_flags: can't parse 'rockchip,pwr-2nd-gpio' property of node '/i2c@ff110000/camera-module@10[0]'
[    3.058636] of_get_named_gpiod_flags: can't parse 'rockchip,pwr-3rd-gpio' property of node '/i2c@ff110000/camera-module@10[0]'
[    3.058642] of_get_named_gpiod_flags: can't parse 'rockchip,flash-gpio' property of node '/i2c@ff110000/camera-module@10[0]'
[    3.058648] of_get_named_gpiod_flags: can't parse 'rockchip,torch-gpio' property of node '/i2c@ff110000/camera-module@10[0]'
[    3.058661] of_get_named_gpiod_flags: parsed 'rockchip,rst-gpio' property of node '/i2c@ff110000/camera-module@10[0]' - status (0)
[    3.094171] ov9750.ov_camera_module_write_config(180) ERR: no active sensor configuration
[    3.094940] ov9750.ov_camera_module_write_config(231) ERR: failed with error -14
[    3.099309] ov9750.pltfrm_camera_module_read_reg(1040) ERR: i2c read from offset 0x0000300b failed with error -6......详见 New.1022.txt

注意：我的UI界面的视频如下，但是显示是有较明显的延迟的。

请问我的板子是否已经运行了硬解码？

我该如何提高解码速度

echo 0x0100 > /sys/module/rk_vcodec/parameter/debug
来打开硬解码调试信息，看下日志就知道有没有走硬解码

打开终端terminal
1. 打开驱动调试打印：
echo 0x0100 > /sys/module/rk_vcodec/parameters/debug

2. 运行python3 opencv_get_NetCamera.py

3.再开启一个终端terminal,输入dmesg
界面如下：
[ 4249.591488] RTW: wlan0- hw port(0) mac_addr =74:ee:2a:36:e8:2a
[ 4249.592909] RTW: p2p0- hw port(1) mac_addr =76:ee:2a:36:e8:2a
[ 4249.604051] RTW: nolinked power save leave
[ 4251.231645] RTW: nolinked power save enter
[ 4312.576237] RTW: wlan0- hw port(0) mac_addr =74:ee:2a:36:e8:2a
[ 4312.577756] RTW: p2p0- hw port(1) mac_addr =76:ee:2a:36:e8:2a
[ 4312.588924] RTW: nolinked power save leave
[ 4314.210268] RTW: nolinked power save enter
[ 4375.602363] RTW: wlan0- hw port(0) mac_addr =74:ee:2a:36:e8:2a
[ 4375.604730] RTW: p2p0- hw port(1) mac_addr =76:ee:2a:36:e8:2a
[ 4375.616426] RTW: nolinked power save leave
[ 4377.183608] RTW: nolinked power save enter
[ 4438.602623] RTW: wlan0- hw port(0) mac_addr =74:ee:2a:36:e8:2a
[ 4438.603995] RTW: p2p0- hw port(1) mac_addr =76:ee:2a:36:e8:2a
[ 4438.621365] RTW: nolinked power save leave
[ 4440.258521] RTW: nolinked power save enter
[ 4501.602736] RTW: wlan0- hw port(0) mac_addr =74:ee:2a:36:e8:2a
[ 4501.604753] RTW: p2p0- hw port(1) mac_addr =76:ee:2a:36:e8:2a
[ 4501.617927] RTW: nolinked power save leave
[ 4503.243650] RTW: nolinked power save enter
[ 4564.546612] RTW: wlan0- hw port(0) mac_addr =74:ee:2a:36:e8:2a
[ 4564.548982] RTW: p2p0- hw port(1) mac_addr =76:ee:2a:36:e8:2a
[ 4564.560799] RTW: nolinked power save leave
[ 4566.145720] RTW: nolinked power save enter
[ 4627.609237] RTW: wlan0- hw port(0) mac_addr =74:ee:2a:36:e8:2a
[ 4627.611365] RTW: p2p0- hw port(1) mac_addr =76:ee:2a:36:e8:2a
......
......
......
[ 7655.093067] rk_vcodec: rkvdec task: 0 ms
[ 7655.094705] rk_vcodec: rkvdec task: 0 ms
[ 7655.096231] rk_vcodec: rkvdec task: 0 ms
[ 7655.097667] rk_vcodec: rkvdec task: 0 ms
[ 7655.099048] rk_vcodec: rkvdec task: 0 ms
[ 7655.100428] rk_vcodec: rkvdec task: 0 ms
[ 7655.393070] rk_vcodec: rkvdec task: 0 ms
[ 7655.395154] rk_vcodec: rkvdec task: 0 ms
[ 7655.397014] rk_vcodec: rkvdec task: 0 ms
[ 7655.398897] rk_vcodec: rkvdec task: 0 ms
[ 7655.400674] rk_vcodec: rkvdec task: 0 ms
[ 7655.402474] rk_vcodec: rkvdec task: 0 ms
[ 7655.695676] rk_vcodec: rkvdec task: 0 ms
[ 7655.697314] rk_vcodec: rkvdec task: 0 ms
[ 7655.700826] rk_vcodec: rkvdec task: 0 ms
[ 7655.702302] rk_vcodec: rkvdec task: 0 ms
[ 7655.703700] rk_vcodec: rkvdec task: 0 ms
[ 7655.711541] rk_vcodec: rkvdec task: 0 ms
[ 7655.741563] rk_vcodec: rkvdec task: 0 ms
[toybrick@toybrick ~]$
javascript:;
javascript:;

[ 7655.741563] rk_vcodec: rkvdec task: 0 ms
说明走的是硬解码，并且你这码率非常低，我们硬解码1ms都不到就解完一帧了

参考以下帖子
RK3399Pro入门教程（7）RTSP库的使用
http://t.rock-chips.com/forum.ph ... p;extra=&page=3
在RK3399Pro  Fedora28 板子上读取rtsp视频流很快。

而本帖子使用的opencv读取视频有明显的延时，我怀疑是opencv解码码流主要在CPU上完成，没有将任务分配到VPU上，所以opencv读取rtsp码流展示是延迟的。