QCamera (auto) exposure/focus settings
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Do you know whether that camera provides a RGB or YUV stream ?
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Do you mind building a custom QtMultimedia with two patches to test that ?
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You can clone QtMultimedia from here and checkout the branch matching your current Qt.
Then:
git fetch https://codereview.qt-project.org/qt/qtmultimedia refs/changes/04/156204/5 && git format-patch -1 --stdout FETCH_HEAD > yuv422.patch
git fetch https://codereview.qt-project.org/qt/qtmultimedia refs/changes/45/156845/2 && git format-patch -1 --stdout FETCH_HEAD > yuv422_avcamera.patchThat will give you two patches that you can apply with:
patch -p1 -i yuv422.patchandpatch -p1 -i yuv422_avcamera.patch.If you have trouble compiling QtMultimedia from git, you can also grab the sources from the installer and just apply the two patches on them. It shouldn't be problematic.
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You can clone QtMultimedia from here and checkout the branch matching your current Qt.
Then:
git fetch https://codereview.qt-project.org/qt/qtmultimedia refs/changes/04/156204/5 && git format-patch -1 --stdout FETCH_HEAD > yuv422.patch
git fetch https://codereview.qt-project.org/qt/qtmultimedia refs/changes/45/156845/2 && git format-patch -1 --stdout FETCH_HEAD > yuv422_avcamera.patchThat will give you two patches that you can apply with:
patch -p1 -i yuv422.patchandpatch -p1 -i yuv422_avcamera.patch.If you have trouble compiling QtMultimedia from git, you can also grab the sources from the installer and just apply the two patches on them. It shouldn't be problematic.
@SGaist Hi, following your instructions I downloaded the git branch corresponding to my Qt version (5.6), applied the patches and finally, compiled the whole source code with no issues (qmake and then make).
Now, what should I do with the content of this "qtmultimedia" folder?
PS: I am running my tests on a Mac system.
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You need to call
make install, that will replace your current QtMultimedia. Then you only have to re-build your application, it should use the new available format if possible (just double check that's indeed the case) -
You need to call
make install, that will replace your current QtMultimedia. Then you only have to re-build your application, it should use the new available format if possible (just double check that's indeed the case) -
It shouldn't break anything but you can copy your QtMultimedia.framework as well as the mediaservices plugin folder.
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It shouldn't break anything but you can copy your QtMultimedia.framework as well as the mediaservices plugin folder.
@SGaist Sorry for my delay. I was busy working on my latest release.
Now that I had some time to run the test, I must say that I couldn't detect any difference in my camera behavior after installing the new version of the QtMultimedia module. The blinking effect remains.
Initially, I was expecting to run my tests on my Mac system. Unfortunately, I couldn't work with the Qt 4.6 version due to some qmake bug I found when I was trying to compile my project, so I decided to try the whole thing from my Linux box.
This is the output I got before compiling:
# qmake Checking for openal... no Checking for alsa... yes Checking for pulseaudio... yes Checking for gstreamer... yes Checking for gstreamer_photography... no Checking for gstreamer_encodingprofiles... yes Checking for gstreamer_appsrc... yes Checking for linux_v4l... yes Checking for resourcepolicy... no Checking for gpu_vivante... noNot sure if this test doesn't have any sense in Linux. Please, let me know if there are another tests related to the webcam management I could run.
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From a quick look at the gstreamer plugin sources, I can't tell if you'll be using that format. You have to check that.
At least since GStreamer 1.0 the format is available (see the qgstutils.cpp file)
