Recent changes to support-requests

cannot build under ubuntu 18.04

Lou Burnard — Sun, 09 Sep 2018 14:41:55 -0000

I am trying to build avcap 0.1.9 under ubuntu 18.04. After downloading I do

.install
make

The install procedure has no fatal errors. However, make would not run because:

"V4L2_ConnectorManager.cpp:29:10: fatal error: linux/videodev.h: No such file or directory"
I tried to fix this by executing

$ sudo ln -s /usr/include/linux/videodev2.h /usr/include/linux/videodev.h

and then ran

$ make clean; make

which produced the following errors:

V4L1_ConnectorManager.cpp:63:24: error: aggregate 'avcap::V4L1_ConnectorManager::query()::video_channel vc' has incomplete type and cannot be defined
   struct video_channel vc;
                        ^~
V4L1_ConnectorManager.cpp:67:44: error: 'VIDIOCGCHAN' was not declared in this scope
   if(ioctl(mDeviceDescriptor->getHandle(), VIDIOCGCHAN, &vc) == -1)
                                            ^~~~~~~~~~~
V4L1_ConnectorManager.cpp:67:44: note: suggested alternative: 'VIDIOC_G_STD'
   if(ioctl(mDeviceDescriptor->getHandle(), VIDIOCGCHAN, &vc) == -1)
                                            ^~~~~~~~~~~
                                            VIDIOC_G_STD
V4L1_ConnectorManager.cpp: In member function 'virtual int avcap::V4L1_ConnectorManager::setVideoInput(avcap::Connector*)':
V4L1_ConnectorManager.cpp:115:23: error: aggregate 'avcap::V4L1_ConnectorManager::setVideoInput(avcap::Connector*)::video_channel vc' has incomplete type and cannot be defined
  struct video_channel vc;
                       ^~
V4L1_ConnectorManager.cpp:119:50: error: 'VIDIOCSCHAN' was not declared in this scope
  int res = ioctl(mDeviceDescriptor->getHandle(), VIDIOCSCHAN, &vc);
                                                  ^~~~~~~~~~~
V4L1_ConnectorManager.cpp:119:50: note: suggested alternative: 'VIDIOC_S_STD'
  int res = ioctl(mDeviceDescriptor->getHandle(), VIDIOCSCHAN, &vc);
                                                  ^~~~~~~~~~~
                                                  VIDIOC_S_STD
Makefile:309: recipe for target 'V4L1_ConnectorManager.lo' failed
make[3]: *** [V4L1_ConnectorManager.lo] Error 1

any suggestions?

Capture format question and error message

Bengt Nilsson — Fri, 05 Jun 2009 20:38:29 -0000

Question: What if the video format for captures on OSX? (.mov, .mpg, etc.)
On OSX,nor the Quicktime Player or VLC does not recognize it.
Or maybe it is because of this (a Creative labs autofocus webcam) :
$ captest -i

Detailed information for capture-device: 0

Name: USB Video Device, Driver: USB Video Class Video

Formats:
0: Y'CbCr 4:2:2 - yuy, fourcc: 1448695129, Resolutions: 640x480, 352x288, 320x240, 176x144, 160x120, 1600x1200

Controls:
Brightness, type: Integer, id: 0, value: 1057, default: 1057, min: 0, max: 65535, step: 1
Blacklevel, type: Integer, id: 1, value: 0, default: 0, min: 0, max: 65535, step: 1
Whitelevel, type: Integer, id: 2, value: 0, default: 0, min: 0, max: 65535, step: 1
Contrast, type: Integer, id: 4, value: 32767, default: 32767, min: 0, max: 65535, step: 1
Hue, type: Integer, id: 3, value: 33314, default: 33314, min: 0, max: 65535, step: 1
Saturation, type: Integer, id: 5, value: 18970, default: 18970, min: 0, max: 65535, step: 1
Sharpness, type: Integer, id: 6, value: 3640, default: 3640, min: 0, max: 65535, step: 1

No input-connectors found.

No output-connectors found.

$ captest -c -f test.dat

Capturing 5 seconds of data from device 0, saving to 'test.dat'.

Format: Y'CbCr 4:2:2 - yuy
Resolution: 640x480
Captured frame: 1 Timestamp: 4544 ms, Valid Bytes: 0TestCaptureHandler: Error writing data.
Captured frame: 2 Timestamp: 4751 ms, Valid Bytes: 614400

$
afaik I have no permission problems.

Does not build on OSX 10.5.7

Bengt Nilsson — Tue, 02 Jun 2009 19:58:31 -0000

./configure is without errors, but make gives this:
make all-recursive
Making all in avcap
Making all in osx
.....
g++ -DHAVE_CONFIG_H -I. -I. -I../.. -I../../include/avcap -I../../include/avcap/osx -g -O2 -MT QT_Device.lo -MD -MP -MF .deps/QT_Device.Tpo -c QT_Device.cpp -fno-common -DPIC -o .libs/QT_Device.o
../../include/avcap/FormatManager.h:120: error: 'STANDARD_ID_T' does not name a type
../../include/avcap/FormatManager.h:123: error: 'STANDARD_ID_T' has not been declared
../../include/avcap/FormatManager.h: In constructor 'avcap::VideoStandard::VideoStandard(const std::string&, int)':
../../include/avcap/FormatManager.h:125: error: class 'avcap::VideoStandard' does not have any field named 'id'
make[3]: *** [QT_Device.lo] Error 1
make[2]: *** [all-recursive] Error 1
make[1]: *** [all-recursive] Error 1
make: *** [all] Error 2