rk3399pro使用opencv调用gstreamer出错

[复制链接] · 发表于 2021-9-9 17:05:07

首先我按步骤编译安装了Mpp和gstreamer-rockchip，然后用以下shell命令成功硬解视频

gst-launch-1.0 filesrc location=/home/toybrick/yolov5/test_data/20210728105542_1km.mp4 ! decodebin ! rkximagesink
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但是我使用opencv调用gstreamer时

gst='filesrc location=/home/toybrick/yolov5/test_data/20210728105542_1km.mp4 ! decodebin ! rkximagesink'

cap = cv.VideoCapture(gst,cv.CAP_GSTREAMER)



if not cap.isOpened():

    print("Cannot capture from camera. Exiting.")

    #os._exit()



while(True):



    ret, frame = cap.read()

    if ret:

        cv.imshow('frame', frame)



    if cv.waitKey(1) & 0xFF == ord('q'):

        break



cap.release()

cv.destroyAllWindows()
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出现了以下错误：

root@debian10:/home/toybrick/yolov5# python gstreamer.py

[ WARN:0] OpenCV | GStreamer warning: cannot find appsink in manual pipeline

[ WARN:0] OpenCV | GStreamer warning: GStreamer: pipeline have not been created

Cannot capture from camera. Exiting.
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按理说opencv调用gstreamer的方法和直接在shell中调用的方法应该是差不多的，为啥会出现这种错误