Hi, I tested and try to resolve from 3 month ago a problem with video and qt5. I have the same problem since qt5 (and now qt5.6 doesn't resolve the problem).
When i start the exemple "Camera" (the QML ones are working fine, not the "Qt widget/C++" one, also no one tell me why this difference), the camera is well recognized, the recording works, but the screen who has to show the image from the camera show a black screen. No one, from the forum or from irc on qt or from archlinux could/would help me for find to resolve this problem. I need help, i failed to resolve it too. the output from terminal is: Unable to query the parameter info: "Argument invalide" Unable to query the parameter info: "Argument invalide" Unable to query the parameter info: "Argument invalide" Unable to query the parameter info: "Argument invalide" Unable to query the parameter info: "Argument invalide" Unable to query the parameter info: "Argument invalide" libva info: VA-API version 0.39.0 libva info: va_getDriverName() returns -1 libva error: va_getDriverName() failed with unknown libva error,driver_name=(null) libva info: VA-API version 0.39.0 libva info: va_getDriverName() returns -1 libva error: va_getDriverName() failed with unknown libva error,driver_name=(null) libva info: VA-API version 0.39.0 libva info: va_getDriverName() returns 0 libva info: Trying to open /usr/lib/dri/i965_drv_video.so libva info: Found init function __vaDriverInit_0_39 libva info: va_openDriver() returns 0 libva info: VA-API version 0.39.0 libva info: va_getDriverName() returns 0 libva info: Trying to open /usr/lib/dri/i965_drv_video.so libva info: Found init function __vaDriverInit_0_39 libva info: va_openDriver() returns 0 Unable to query the parameter info: "Argument invalide" Unable to query the parameter info: "Argument invalide" CameraBin error: "failed to validate source buffer" CameraBin error: "Erreur interne de flux de données." CameraBin error: "Erreur interne de flux de données." my distro is archlinux (64bits) my GPU is from the mobo intel CPU i7 (HD4600) lspci | grep VGA 00:02.0 VGA compatible controller: Intel Corporation Xeon E3-1200 v3/4th Gen Core Processor Integrated Graphics Controller (rev 06) drivers installed: xf86-video-intel 1:2.99.917+587+gc186d4d-1 libva-intel-driver 1.7.0-1 mesa 11.1.2-1 intel-ucode 20151106-1 (and well mounted on boot with initramfs image) intel-tbb 4.4_20160128-1 libvdpau-va-gl 0.3.6-1 gstreamermm 1.4.3-2 qt5-gstreamer 1.2.0-2 phonon-qt5-gstreamer 4.8.2-4 gstreamer0.10-good 0.10.31-10 gstreamer0.10-good-plugins 0.10.31-10 gstreamer0.10-ffmpeg 0.10.13-2 gstreamer-vaapi 1.6.0-1 gstreamer 1.6.3-1 gst-libav 1.6.3-3 gst-plugins-good 1.6.3-1 gstreamer-vaapi 1.6.0-1 lib32-mesa cat /etc/X11/xorg.conf.d/20_intel.conf Section "Device" Identifier "Intel Graphics" Driver "intel" Option "DRI" "false" Option "TearFree" "true" EndSection (DRI to 3 has same result) sudo lshw -c video description: VGA compatible controller produit: Xeon E3-1200 v3/4th Gen Core Processor Integrated Graphics Controller fabriquant: Intel Corporation identifiant matériel: 2 information bus: pci@0000:00:02.0 version: 06 bits: 64 bits horloge: 33MHz fonctionnalités: msi pm vga_controller bus_master cap_list rom configuration: driver=i915 latency=0 ressources: irq:46 mémoire:ef400000-ef7fffff mémoire:c0000000-cfffffff portE/S:f000(taille=64) _______________________________________________ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest