libv4l defaults to obsolete API if no libv4l1 detected (Bug #4471)

Added by Stanislaw Halik over 9 years ago. Updated over 9 years ago.

Status:New Start date:2015-07-08
Priority:Normal Due date:
Assignee:- % Done:

0%
Category:highgui-video
Target version:-
Affected version:branch 'master' (3.0-dev) Operating System:Linux
Difficulty:Easy HW Platform:Any
Pull request:

Description

libv4l1 hasn't been included in distros for some time. In cmake/OpenCVFindLibsVideo.cmake there's the block of code:

# --- V4L ---
ocv_clear_vars(HAVE_LIBV4L HAVE_CAMV4L HAVE_CAMV4L2 HAVE_VIDEOIO)
if(WITH_V4L)
  if(WITH_LIBV4L)
    CHECK_MODULE(libv4l1 HAVE_LIBV4L1)
    CHECK_MODULE(libv4l2 HAVE_LIBV4L2)
    if(HAVE_LIBV4L1 AND HAVE_LIBV4L2)
      set(HAVE_LIBV4L YES)

Please omit libv4l1 from this check, it's not necessary. The other plugin chosen in this case can't set FPS and crashes on multiple launches.

# --- V4L ---
ocv_clear_vars(HAVE_LIBV4L HAVE_CAMV4L HAVE_CAMV4L2 HAVE_VIDEOIO)
if(WITH_V4L)
  if(WITH_LIBV4L)
    CHECK_MODULE(libv4l2 HAVE_LIBV4L2)
    if(HAVE_LIBV4L2)
      set(HAVE_LIBV4L YES)

History

#1
Updated by Maksim Shabunin over 9 years ago

Issue has been transferred to GitHub: https://github.com/Itseez/opencv/issues/5064

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