Cant set 2560x1440 for logitech brio

C++
,
1

hi all

my Logitech BRIO cam can stream 2560x1440 30 fps with guvcview, but cant with opencv

code is simple:

VideoCapture cap;
cap.open(0);
cap.set(CAP_PROP_FRAME_WIDTH, 2560);
cap.set(CAP_PROP_FRAME_HEIGHT, 1440);

with only cap.open(0) - it opens fine with 1920x1080x30

how to open and set cam to work with 2560x1440x30 ?

ubuntu 20.04, opencv 4.2.0, g++ 9.4.0

2

set FOURCC property to MJPG

1 Like
3

thanks for answer !

then i tryed

cap.set(cv::CAP_PROP_FOURCC, VideoWriter::fourcc(‘M’, ‘J’, ‘P’, ‘G’))

i got

setProperty OpenCV | GStreamer warning: GStreamer: unhandled property

is it possible (may be some set in OS for gstreamer), so then calling cap.open(0) it will opens cam in 2560x1440x30 ?

4

then sidestep the gstreamer backend, set apiPreference to CAP_V4L and that should work.

5

thanks !

the working code is :

cap.open(0, CAP_V4L);
cap.set(cv::CAP_PROP_FOURCC, VideoWriter::fourcc(‘M’, ‘J’, ‘P’, ‘G’));
cap.set(CAP_PROP_FRAME_WIDTH, 2560);
cap.set(CAP_PROP_FRAME_HEIGHT, 1440);