linux - Grabbing Images from a Webcam to be used with OpenCV -


this follow previous question,

opencv ps 3 eye

can suggest library allow me grab frames camera without fuss (like video videoinput lib windows) , pass them opencv within application?

i had parallel problem using different webcam: worked in cheese/etc, v4l-info showed proper setup, opencv fail with:

highgui error: v4l2: pixel format of incoming image unsupported opencv unable stop stream.: bad file descriptor

after flailing found at least 1 guy had similar problems webcams in various applications.

in blind faith promptly punched in export ld_preload=/usr/lib/libv4l/v4l1compat.so , «poof» worked.

the opencv v4l2 interface not robust v4l implementation , export quick workaround (opencv appears revert v4l).

with quick browse of opencv/modules/highgui/src/cap_v4l.cpp appear though opencv use v4l2.

i'm running ubuntu lucid 2.6.32-28-generic x86_64, libv4l-0 v0.6.4-1ubuntu1 opencv pulled head of repo few days ago.

in course of explaining i've resolved issue. turns out opencv forces resolution on v4l2 device 640x480 default - , device had max 320x240 resolution caused fault when testing format type in opencv::highgui::cap_v41::try_palette_v4l2. changed default_v4l_width and, default_v4l_height.


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