i.MX Processors中的主题 Re: opencv vpudec appsink

opencv vpudec appsink

coindu — Wed, 25 Nov 2020 08:33:15 GMT

I want to use python-opecv to displayer video frame with vpudec. but only use vpudec as appsink input，the color will be black and white；When add videoconvert after vpudec the displayer will

be very slow.

environment BSP 5.4.3 opencv version 4.2.0

Anyone who can help me fix it?

···

#!/usr/bin/env python3
import cv2
if __name__ == '__main__':

mode = r'filesrc location=/home/root/qq.mp4 typefind=true ! video/quicktime ! aiurdemux ! queue ! h264parse ! vpudec ! appsink'
#mode = r'filesrc location=/home/root/qq.mp4 typefind=true ! video/quicktime ! aiurdemux ! queue ! h264parse ! vpudec ! videoconvert ! queue ! appsink'
cap = cv2.VideoCapture(mode,cv2.CAP_GSTREAMER)
while True:
ret,frame = cap.read()
a=len(frame.shape)
print(a)

if ret is False:
break

cv2.imshow('appFrame',frame)
key = cv2.waitKey(20)
if key == 49:
cv2.destroyAllWindows()
cap.release()

···

Re: opencv vpudec appsink

joanxie — Thu, 26 Nov 2020 09:10:29 GMT

what board do you use? did you install phyton2 opencv successfully on yocto, right?

Re: opencv vpudec appsink

coindu — Thu, 26 Nov 2020 09:19:58 GMT

IMX8MM and IMX8MQ board to test.

Of cause ,the python opecv installed sucuess. Because I have run the python script on the platform.

I'm just confused about the situation now.

Re: opencv vpudec appsink

joanxie — Wed, 09 Dec 2020 06:45:22 GMT

one can refer to the command from the link as below:

https://community.nxp.com/t5/i-MX-Processors/OpenCV-and-GStreamer-on-iMX8QM-MEK/m-p/1179587