CameraBin error: "Failed to allocate required memory." with QCamera

[p1ng]

With libcamera-still i can see the preview and control the camera but
this happens when i run multimediawidgets/camera example application
CameraBin error: "Failed to allocate required memory."

Hardware:
Raspberry Pi 4
8GB Compute Module 4
CamArray Hat with four 64MB hawkeye autofocus cameras connected
SKU: MBS-SES-256
GTIN: 0618455044205
purchase link https://www.mybotshop.de/ArduCam-64MP-Autofocus-Quad-Camera-Kit-for-Raspberry-Pi_1

Software:
Linux raspberrypi 5.10.92-v7l+ #1514 SMP Mon Jan 17 17:38:03 GMT 2022 armv7l GNU/Linux
Qt 5.15.2

More info:
pi@raspberrypi:~ $ libcamera-still --list-cameras
Available cameras

0 : arducam_64mp [9248x6944] (/base/soc/i2c0mux/i2c@0/arducam_64mp@1a)
Modes: 'SRGGB10_CSI2P' : 1280x720 [120.03 fps - (2064, 2032)/5120x2880 crop]
1920x1080 [60.04 fps - (784, 1312)/7680x4320 crop]
2312x1736 [30.00 fps - (0, 0)/9248x6944 crop]
3840x2160 [20.00 fps - (784, 1312)/7680x4320 crop]
4624x3472 [10.00 fps - (0, 0)/9248x6944 crop]
9152x6944 [2.70 fps - (0, 0)/9152x6944 crop]

pi@raspberrypi:~ $ dmesg | grep arducam
[ 9.034734] arducam_64mp: loading out-of-tree module taints kernel.
[ 9.048257] arducam_64mp 0-001a: Device found Arducam 64MP.
[ 9.048751] arducam_64mp 0-001a: Consider updating driver arducam_64mp to match on endpoints
[ 9.059052] arducam_64mp 10-001a: failed to read chip id 682, with error -5
[ 9.059883] arducam_64mp: probe of 10-001a failed with error -5

pi@raspberrypi:~ $ df
Filesystem 1K-blocks Used Available Use% Mounted on
/dev/root 7187728 5195536 1644816 76% /
devtmpfs 752644 0 752644 0% /dev
tmpfs 958468 43300 915168 5% /dev/shm
tmpfs 383388 1296 382092 1% /run
tmpfs 5120 4 5116 1% /run/lock
/dev/mmcblk0p1 258095 49445 208651 20% /boot
tmpfs 191692 28 191664 1% /run/user/1000

Any ideas how to fix this?

[p1ng]

@p1ng The qcam was still too difficult to integrate. I found edwards libcamera-cpp-demo by far the simplest example to integrate libcamera to my own code:
https://github.com/edward-ardu/libcamera-cpp-demo

My slightly modified version of this that specifies multiple cameras:
https://github.com/edward-ardu/libcamera-cpp-demo/tree/7b3f9b97a479fb49beb01db1ddd77f5090fa52dc

[p1ng]

os boots from CM4 that has 2GB of RAM if it is of any relevance.

[p1ng]

@p1ng seems that the problem is with gstreamer v4l2 drivers as qcamera is using it and standalone gsteramer doesent work either.
the bug appears to have recently been fixed with 1.22.1 build at https://gstreamer.freedesktop.org/

v4l2h264dec: Fix Raspberry Pi4 will not play video in application

but i have yet no idea how to install that 1.22.1 version. the one i get with apt-get is 1.18

any help?

[SGaist]

@p1ng hi and welcome to devnet,

The hardcore way is to build that version of GStreamer yourself.

[p1ng]

@SGaist I found the instructions about how to build qstreamer 1.22.1 here
https://gitlab.freedesktop.org/gstreamer/gstreamer/-/tree/1.22.1
Currently following the instructions and have build running.
Also for others that might have the same issue: I had to get the 1.22.1 source code from https://gitlab.freedesktop.org/gstreamer/gstreamer/-/archive/1.22.1/gstreamer-1.22.1.tar.gz
because what i checkout from git didnt compile for some reason. Also compilation does not work with gcc7 but seems to work with gcc11 so make sure u dont have gcc7 in alternatives.

Do I also need to rebuild qt from source for this fix to get into the qt apps im developing as the gstreamer is part of the libqt5multimedia5-plugins?

"Building the Qt5 QML plugin
If qmake is not in PATH and pkgconfig files are not available, you can
point the QMAKE env var to the Qt5 installation of your choosing before
running meson as shown above.
The plugin will be automatically enabled if possible, but you can ensure that
it is built by passing -Dgood=enabled -Dgst-plugins-good:qt5=enabled to meson."

can anybody write me specific command line commands that i have to in this step?
i checked qmake is not in my PATH
devasus@devasus:~/Desktop/gstreamer-1.22.1$ echo $PATH
/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/bin:/snap/bin

but when i just write $ qmake in terminal then it finds the qmake
which qmake
/usr/bin/qmake

"you can
point the QMAKE env var to the Qt5 installation of your choosing before
running meson as shown above."

How do I do that? do i have to add somethign to the path like
export PATH=/Qt5.14.2/5.14.2/gcc_64/bin:$PATH

Im confused

[p1ng]

@p1ng i suppose these are the libraries that i need to compile from source and install?

https://packages.debian.org/source/stretch/qt-gstreamer
https://launchpad.net/ubuntu/+source/qt-gstreamer

is that correct? and do they get compiled when i compile entire qt from source?

when could I expect the qt-gstreamer 1.22.1 be included in the binary in the package repository for Raspberry Pi OS? so I can install it with
sudo apt-get install libqt5multimedia5-plugins
sudo apt-get install libgstreamer1.0-dev libgstreamer-plugins-base1.0-dev libgstreamermm-1.0-dev

I found the qt-gstreamer source code also. Do I need to build this as well?
https://gstreamer.freedesktop.org/data/src/qt-gstreamer/

I am currently in the process of building the binaries, if Im successful is it possible for me to uplaod them to apt package repository so that they will be available for everyone?

[SGaist]

QtGStreamer is an obsolete and independent package that has nothing to do with QtMultimedia. You can ignore it.

[p1ng]

@SGaist I see. Yes i just checked dependencies
henri@henri-MS-7A72:~$ apt-cache depends libqt5multimedia5-plugins
libqt5multimedia5-plugins
Depends: libqt5multimedia5
Depends: libasound2
Depends: libc6
Depends: libglib2.0-0
Depends: libgstreamer-plugins-base1.0-0
Depends: libgstreamer1.0-0
Depends: libpulse0
Depends: libqt5core5a
|Depends: libqt5gui5
Depends: libqt5gui5-gles
Depends: libqt5multimediagsttools5
Depends: libqt5network5
Depends: libstdc++6

This means i have to

1. Remove libraries
   sudo apt-get remove libqt5multimedia5-plugins
   sudo apt-get remove libgstreamer1.0 libgstreamer-plugins-base1.0 libgstreamermm-1.0
   just in case
   sudo apt-get remove libgstreamer1.0 libgstreamer-plugins-base1.0-dev libgstreamermm-1.0

2. Build and install gstreamer 1.22.1 from source following this guide in README:
   https://gitlab.freedesktop.org/gstreamer/gstreamer/-/tree/1.22.1

3. Install the libq5multimedia5-plugins again
   sudo apt-get install libqt5multimedia5-plugins

4. Cross my fingers and pray

Is this correct?

[p1ng]

So this is where im at right now

sudo apt-get remove libqt5multimedia5-plugins
sudo apt-get remove libgstreamer1.0 libgstreamer-plugins-base1.0 libgstreamermm-1.0

Just in case

sudo apt-get remove libgstreamer*

VERY IMPORTNANT TO INSTALL meson as root otherwise will get build issue

$sudo pip3 install meson
$sudo pip3 install markdow typogrify
$sudo apt-get update
$sudo apt-get install ninja-build
$sudo apt install -y build-essential autotools-dev automake autoconf
libtool autopoint libxml2-dev zlib1g-dev libglib2.0-dev
pkg-config bison flex python3 git gtk-doc-tools libasound2-dev
libgudev-1.0-dev libxt-dev libvorbis-dev libcdparanoia-dev
libpango1.0-dev libtheora-dev libvisual-0.4-dev iso-codes
libgtk-3-dev libraw1394-dev libiec61883-dev libavc1394-dev
libv4l-dev libcairo2-dev libcaca-dev libspeex-dev libpng-dev
libshout3-dev libjpeg-dev libaa1-dev libflac-dev libdv4-dev
libtag1-dev libwavpack-dev libpulse-dev libsoup2.4-dev libbz2-dev
libcdaudio-dev libdc1394-22-dev ladspa-sdk libass-dev
libcurl4-gnutls-dev libdca-dev libdvdnav-dev \

Make sure to get the tarball because checkout out 1.22.1 tag from git gave me problems i could not resolve.

$wget https://gitlab.freedesktop.org/gstreamer/gstreamer/-/archive/1.21.1/gstreamer-1.21.1.tar.gz
$tar -xf gstreamer-1.21.1.tar.gz
$cd gstreamer-1.21.1.tar.gz

FFmpeg didnt compile on my RPI4 (32-it OS), so to disable it cause got some ARMv proessor arhcitecture errors.

$meson builddir -Dgst-plugins-base:gl_winsys=egl -Dlibav=disabled
$ninja -C builddir
$meson setup builddir
$meson compile -C buildir

$sudo meson install -C builddir$ gst-launch-1.0 --version
gst-launch-1.0: error while loading shared libraries: libgstreamer-1.0.so.0: cannot open shared object file: No such file or directory

$sudo gedit /etc/ld.so.conf.d/randomLibs.conf
#add this line to the file or if the ibgstreamer-1.0.so.0 was installed somewhere else add that path
/usr/local/lib/arm-linux-gnueabihf
sudo ldconfig

$gst-launch-1.0 --version
gst-launch-1.0 version 1.21.1
GStreamer 1.21.1
Unknown package origin

When i try to run my app that uses QCamera this is the error i get:

Error: cannot create camera service, the 'camerabin' plugin is missing for GStreamer 1.18.
Please install the 'bad' GStreamer plugin package.

I will now try to compile and install the bad plugin package with -Dbad=enabled. But im not sure if it will fix this because it seems to me that when i install sudo apt-get install qtmultimedia5-dev this will automatically install and try to use the 1.18 gstreamer - this is what i conclude from that error message.

[p1ng]

$meson builddir --reconfigure -Dbad=enabled -Dgst-plugins-base:gl_winsys=egl,wayland -Dlibav=disabled -Dgst-plugins-bad:camerabin2=enabled
$meson compile -C builddir
$meson install -C builddir

And now my QCamera cant even detect the camera....

Can you reccommend me some other class I could use for this camera? I see some people have used the qcam code from lib-camera. Anybody have a working project setup with that code?

All i need is to have the cameras to be able to capture pictures and control zoom from my Qt application.

[p1ng]

@p1ng
So I just found out that the fix in gstreamer 1.22.1 that makes camera work with Qt is just one line in gstreamer source code. What i will try next is to check out gstreamer 1.18 source code, put that fix in it, compile and install since my qt app was able to reqonize camera when gstreamer 1.18 was installed. This is the fix if im not mistaken: https://gitlab.freedesktop.org/gstreamer/gstreamer/-/commit/67df248270491116af6099bf3bec5c740dfe3042
67df2482
v4l2h264dec: Fix Raspberry Pi4 will not play video in application

and if that doesent work ill probably try to use qcam source from libcamera examples instead of QCamera

[p1ng]

That didnt work out.

# On my Ubuntu 22.04 PC
wget https://downloads.raspberrypi.org/raspios_armhf/images/raspios_armhf-2022-01-28/2022-01-28-raspios-bullseye-armhf.zip
git clone https://github.com/raspberrypi/usbboot.git
cd usbboot
# Flip the BOOT switch on RPI to ON
sudo ./rpiboot
wget https://github.com/balena-io/etcher/releases/download/v1.18.4/balenaEtcher-1.18.4-x64.AppImage
chmod +x balenaEtcher-1.18.4-x64.AppImage
./balenaEtcher-1.18.4-x64.AppImage
# Flashed to my RPi4 CM4


# On my RPI4 CM4
wget -O install_pivariety_pkgs.sh https://github.com/ArduCAM/Arducam-Pivariety-V4L2-Driver/releases/download/install_script/install_pivariety_pkgs.sh
chmod +x install_pivariety_pkgs.sh
2. Install libcamra-dev
./install_pivariety_pkgs.sh -p libcamera_dev
3. Install libcamera-apps
./install_pivariety_pkgs.sh -p libcamera_apps
4. Install the kernel driver
./install_pivariety_pkgs.sh -p 64mp_pi_hawk_eye_kernel_driver
5. Configuration
Open /boot/config.txt, under [all], add the following line:
dtoverlay=vc4-kms-v3d,cma-512
Example:
[all]
# Run as fast as firmware / board allows
arm_boost=1
dtoverlay=vc4-kms-v3d,cma-512
# Enabled i2c under interfaces
sudo raspi-config
reboot

# Compiling gstreamer 1.18
sudo pip3 install meson
sudo apt-get update
# have to use gst-build for v<19 https://gstreamer.freedesktop.org/documentation/installing/building-from-source-using-meson.html?gi-language=c
git clone https://gitlab.freedesktop.org/gstreamer/gst-build.git
cd gst-build
$sudo apt install -y  build-essential autotools-dev automake autoconf \
                                    libtool autopoint libxml2-dev zlib1g-dev libglib2.0-dev \
                                    pkg-config bison flex python3 git gtk-doc-tools libasound2-dev \
                                    libgudev-1.0-dev libxt-dev libvorbis-dev libcdparanoia-dev \
                                    libpango1.0-dev libtheora-dev libvisual-0.4-dev iso-codes \
                                    libgtk-3-dev libraw1394-dev libiec61883-dev libavc1394-dev \
									libv4l-dev libcairo2-dev libcaca-dev libspeex-dev libpng-dev \
                                    libshout3-dev libjpeg-dev libaa1-dev libflac-dev libdv4-dev \
                                    libtag1-dev libwavpack-dev libpulse-dev libsoup2.4-dev libbz2-dev \
                                    libcdaudio-dev libdc1394-22-dev ladspa-sdk libass-dev \
                                    libcurl4-gnutls-dev libdca-dev libdvdnav-dev \
meson build --buildtype=release -Dgst-plugins-good:qt5=disabled -Dbad=enabled -Dgst-plugins-base:gl_winsys=egl -Dlibav=disabled -Dgst-plugins-bad:camerabin2=enabled

# At this point i installed gstreamer tools to see if standalone gstreamer tools will play my cameras
# install a missing dependency
$ sudo apt-get install libx264-dev libjpeg-dev
# install the remaining plugins
$ sudo apt-get install libgstreamer1.0-dev \
     libgstreamer-plugins-base1.0-dev \
     libgstreamer-plugins-bad1.0-dev \
     gstreamer1.0-plugins-ugly \
     gstreamer1.0-tools \
     gstreamer1.0-gl \
     gstreamer1.0-gtk3 

# Confirmed that current standalone gsteamer plays video. 
gst-launch-1.0 libcamerasrc ! video/x-raw, width=640, height=480, framerate=30/1 ! videoconvert ! videoscale ! clockoverlay time-format="%D %H:%M:%S" ! autovideosink

# This made me curious to install qt and try to run camera example project to confirm it dosent work before i try to compile & install the 1.18.6 version
sudo apt-get install qtbase5-dev qtchooser qt5-qmake qtbase5-dev-tools 
sudo apt-get install cmake
sudo apt-get install clan
sudo apt-get install qtmultimedia5-dev 
sudo apt-get install qtcreator
~/Qt/5.14.2/Examples/Qt-5.14.2$ scp -r multimediawidgets pi@192.168.88.249:/home/pi/Desktop/Examples
~/Qt/5.14.2/Examples/Qt-5.14.2$ scp -r multimediawidgets pi@192.168.88.249:/home/pi/Desktop/multimedia

# Built and compiled the Examples/camera in qtcreator but got error "CameraService is missing"
sudo apt-get install libqt5multimedia5-plugins

# Now i get the CameraBin error: "Failed to allocate memory". So proceed with meson compilation

# I also checked the version of different gstreamer libraries/tools i currenlty have installed
pi@raspberrypi:~/devdirs/gst-1.18.6/gst-build $ dpkg -l | grep gstream*
ii  gir1.2-gstreamer-1.0:armhf             1.18.4-2.1                       armhf        GObject introspection data for the GStreamer library
ii  gstreamer1.0-alsa:armhf                1.18.4-2                         armhf        GStreamer plugin for ALSA
ii  gstreamer1.0-gl:armhf                  1.18.4-2                         armhf        GStreamer plugins for GL
ii  gstreamer1.0-gtk3:armhf                1.18.4-2+deb11u1+rpt1            armhf        GStreamer plugin for GTK+3
ii  gstreamer1.0-libav:armhf               1.18.4-3                         armhf        ffmpeg plugin for GStreamer
ii  gstreamer1.0-omx                       1.0.0.1-0+rpi12+jessiepmg        armhf        GStreamer OpenMAX plugins
ii  gstreamer1.0-plugins-bad:armhf         1.18.4-3                         armhf        GStreamer plugins from the "bad" set
ii  gstreamer1.0-plugins-base:armhf        1.18.4-2                         armhf        GStreamer plugins from the "base" set
ii  gstreamer1.0-plugins-good:armhf        1.18.4-2                         armhf        GStreamer plugins from the "good" set
ii  gstreamer1.0-plugins-ugly:armhf        1.18.4-2                         armhf        GStreamer plugins from the "ugly" set
ii  gstreamer1.0-tools                     1.18.4-2.1                       armhf        Tools for use with GStreamer
ii  gstreamer1.0-x:armhf                   1.18.4-2                         armhf        GStreamer plugins for X11 and Pango
ii  libgstreamer-gl1.0-0:armhf             1.18.4-2                         armhf        GStreamer GL libraries
ii  libgstreamer-opencv1.0-0:armhf         1.18.4-3                         armhf        GStreamer OpenCV libraries
ii  libgstreamer-plugins-bad1.0-0:armhf    1.18.4-3                         armhf        GStreamer libraries from the "bad" set
ii  libgstreamer-plugins-bad1.0-dev:armhf  1.18.4-3                         armhf        GStreamer development files for libraries from the "bad" set
ii  libgstreamer-plugins-base1.0-0:armhf   1.18.4-2                         armhf        GStreamer libraries from the "base" set
ii  libgstreamer-plugins-base1.0-dev:armhf 1.18.4-2                         armhf        GStreamer development files for libraries from the "base" set
ii  libgstreamer1.0-0:armhf                1.18.4-2.1                       armhf        Core GStreamer libraries and elements
ii  libgstreamer1.0-dev:armhf              1.18.4-2.1                       armhf        GStreamer core development files
ii  libqt5gstreamer-1.0-0:armhf            1.2.0-5.1                        armhf        C++ bindings library for GStreamer with a Qt-style API - Qt 5 build

pi@raspberrypi:~/devdirs/gst-1.18.6/gst-build $ apt list | grep libqt5multimedia5-plugins
libqt5multimedia5-plugins/stable,now 5.15.2-3 armhf [installed]

# Compile 
pi@raspberrypi:~/devdirs/gst-1.18.6/gst-build $ cp subprojects/gst-plugins-good/sys/v4l2/gstv4l2object.c subprojects/gst-plugins-good/sys/v4l2/gstv4l2object.c_backup
pi@raspberrypi:~/devdirs/gst-1.18.6/gst-build $ nano subprojects/gst-plugins-good/sys/v4l2/gstv4l2object.c

#Search for method gst_v4l2_object_stop and replace it with 
gboolean
gst_v4l2_object_stop (GstV4l2Object * v4l2object)
{
  GstBufferPool *pool;
  GST_DEBUG_OBJECT (v4l2object->dbg_obj, "stopping");

  if (!GST_V4L2_IS_OPEN (v4l2object))
    goto done;
  if (!GST_V4L2_IS_ACTIVE (v4l2object))
    goto done;

  pool = gst_v4l2_object_get_buffer_pool (v4l2object);
  if (pool) {
    if (!gst_v4l2_buffer_pool_orphan (v4l2object)) {
      GST_DEBUG_OBJECT (v4l2object->dbg_obj, "deactivating pool");
      gst_buffer_pool_set_active (pool, FALSE);

      {
        GstBufferPool *old_pool;
        GST_OBJECT_LOCK (v4l2object->element);
        old_pool = v4l2object->pool;
        v4l2object->pool = NULL;
        GST_OBJECT_UNLOCK (v4l2object->element);
        if (old_pool)
          gst_object_unref (old_pool);
      }
    }
    gst_object_unref (pool);
  }

  GST_V4L2_SET_INACTIVE (v4l2object);

done:
  return TRUE;
}

# Add gst_v4l2_object_get_buffer_pool methdo to the end of the file

GstBufferPool *
gst_v4l2_object_get_buffer_pool (GstV4l2Object * v4l2object)
{
  GstBufferPool *ret = NULL;

  g_return_val_if_fail (v4l2object != NULL, NULL);

  GST_OBJECT_LOCK (v4l2object->element);
  if (v4l2object->pool)
    ret = gst_object_ref (v4l2object->pool);
  GST_OBJECT_UNLOCK (v4l2object->element);

  return ret;
}

# Add this line to subprojects/gst-plugins-good/sys/v4l2/gstv4l2object.h at the end of /* probing */ block 
GstBufferPool * gst_v4l2_object_get_buffer_pool (GstV4l2Object * v4l2object);

# Now compile gstreamer 1.18.6
ninja -C build
sudo ninja -C build install

pi@raspberrypi:~/devdirs/gst-1.18.6/gst-build $  dpkg -l | grep gstream*
ii  gir1.2-gstreamer-1.0:armhf             1.18.4-2.1                       armhf        GObject introspection data for the GStreamer library
ii  gstreamer1.0-alsa:armhf                1.18.4-2                         armhf        GStreamer plugin for ALSA
ii  gstreamer1.0-gl:armhf                  1.18.4-2                         armhf        GStreamer plugins for GL
ii  gstreamer1.0-gtk3:armhf                1.18.4-2+deb11u1+rpt1            armhf        GStreamer plugin for GTK+3
ii  gstreamer1.0-libav:armhf               1.18.4-3                         armhf        ffmpeg plugin for GStreamer
ii  gstreamer1.0-omx                       1.0.0.1-0+rpi12+jessiepmg        armhf        GStreamer OpenMAX plugins
ii  gstreamer1.0-plugins-bad:armhf         1.18.4-3                         armhf        GStreamer plugins from the "bad" set
ii  gstreamer1.0-plugins-base:armhf        1.18.4-2                         armhf        GStreamer plugins from the "base" set
ii  gstreamer1.0-plugins-good:armhf        1.18.4-2                         armhf        GStreamer plugins from the "good" set
ii  gstreamer1.0-plugins-ugly:armhf        1.18.4-2                         armhf        GStreamer plugins from the "ugly" set
ii  gstreamer1.0-tools                     1.18.4-2.1                       armhf        Tools for use with GStreamer
ii  gstreamer1.0-x:armhf                   1.18.4-2                         armhf        GStreamer plugins for X11 and Pango
ii  libgstreamer-gl1.0-0:armhf             1.18.4-2                         armhf        GStreamer GL libraries
ii  libgstreamer-opencv1.0-0:armhf         1.18.4-3                         armhf        GStreamer OpenCV libraries
ii  libgstreamer-plugins-bad1.0-0:armhf    1.18.4-3                         armhf        GStreamer libraries from the "bad" set
ii  libgstreamer-plugins-bad1.0-dev:armhf  1.18.4-3                         armhf        GStreamer development files for libraries from the "bad" set
ii  libgstreamer-plugins-base1.0-0:armhf   1.18.4-2                         armhf        GStreamer libraries from the "base" set
ii  libgstreamer-plugins-base1.0-dev:armhf 1.18.4-2                         armhf        GStreamer development files for libraries from the "base" set
ii  libgstreamer1.0-0:armhf                1.18.4-2.1                       armhf        Core GStreamer libraries and elements
ii  libgstreamer1.0-dev:armhf              1.18.4-2.1                       armhf        GStreamer core development files
ii  libqt5gstreamer-1.0-0:armhf            1.2.0-5.1                        armhf        C++ bindings library for GStreamer with a Qt-style API - Qt 5 build

# So the packages i compiled were not replace with packages from remote repo i installed with apt-get
sudo apt-get remove gstreamer1.0-plugins-good

# Now when i do
pi@raspberrypi:~ $ gst-launch-1.0 --version
gst-launch-1.0 version 1.18.6
GStreamer 1.18.6
Unknown package origin

# But after that removal the gst-launch-1.0 cant play back camera anymore. Maybe it was my "fix" in code that broke it. Ill roll that back and rebuild
# So what i did now is that i uninstalled everything related to gstreamer
sudo apt-get remove libgstreamer* libqt5gstreamer* gstreamer1.0*

at this point i give up and work on some other stuff. maybe over time somebody will fix it for qt5 or ill try to use libcamera https://git.libcamera.org/libcamera/libcamera.git/tree/src/apps/qcam instead of QCamera or ill see if my camera works in qt6.

[p1ng]

@p1ng I gave it one more try. Compiled qt5.15.2 from source, then cross-compiled it for RPI4, 32-bit bullseye 6.1.xx

Compiled gstreamer 1.22.1 from source that i thought has fix for it.

Then ran my qt app that uses Camera, i get the same failed to allocate required memory error.

Running gstreamer from command line gives the same error:
gst-launch-1.0 -v v4l2src device=/dev/video0 ! fbdevsink

From this i conclude that the issue has not been fixed in gstreamer and i have to use libcamera qcam example to get qt into my raspberry qt app.

[p1ng]

@p1ng If i give gstreamer libcamerasrc though then the camera preview works
gst-launch-1.0 libcamerasrc ! glimagesink

what would i need to modify in QT source code for it to use libcamerasrc?
something in gstreamercamerabin?

[p1ng]

I managed to convert libcamera simple-cam meson example to QT project. I used chatgpt to convert meson.build to .pro file. For those in the future who are struggling integrating libcamera to qt i have uploaded the project to https://github.com/henrihallik/simple-cam-qt.
Also chatgpt proved vital working through various linker errors that occured. So if u need more help , just ask OpenAIs chatgpt. https://chat.openai.com/chat

[p1ng]

@p1ng so the simple-cam-qt was too difficult to figure out how to modify to capture an image with set resoluton. So I converted libcameras qcam project to qt project that already has image capture functionality in it.
U can get it here if u want to:

https://github.com/henrihallik/myqam

[p1ng]

@p1ng The qcam was still too difficult to integrate. I found edwards libcamera-cpp-demo by far the simplest example to integrate libcamera to my own code:
https://github.com/edward-ardu/libcamera-cpp-demo

My slightly modified version of this that specifies multiple cameras:
https://github.com/edward-ardu/libcamera-cpp-demo/tree/7b3f9b97a479fb49beb01db1ddd77f5090fa52dc

[JoeCFD]

@p1ng Try 1.22.3 and it has more bug fixes.

the steps(order) to install the latest gstreamer

1. you may need to get the latest libva and build it.
2. build gstreamer and make sure all needed plugins are built.
3. build the driver of graphics card(for examples: media driver from Intel).
4. build camera llib and Qt multimedia plugin
5. set lib/bin path for installed gstreamer and export new driver path LIBVA_DRIVERS_PATH

Since it is easy to make mistakes in gstreamer build, do not try to install it in default dirs like /usr/lib etc. Instead install all packages under /opt/gstreamer. In case anything goes wrong, you can remove the whole installation and redo it. Otherwise, you may have difficulty to use videos on your machine later on. Some installations can not be removed automatically and you have to remove them manually. Things can get very messy.