Codec h264_cuvid is not supported

[trufane]

Hi, I'm new in Qt. There's a problem that's been bothering me for days: When I use QMediaPlayer to play mp4 videos, but there is only sound output but no video output.the console reports an error:

Codec h264_cuvid is not supported.

System environment：

System: Debian GNU/Linux 12 (bookworm)
Kernal: Linux debian 6.1.0-17-amd64
Qt version: gcc_64 6.6.1

QT 6 uses Gstreamer by default on Linux, but I've already installed it：

trufane@debian:~$ apt list gstreamer* --installed 
正在列表... 完成
gstreamer1.0-alsa/stable,stable-security,now 1.22.0-3+deb12u1 amd64 [已安装]
gstreamer1.0-gl/stable,stable-security,now 1.22.0-3+deb12u1 amd64 [已安装]
gstreamer1.0-gtk3/stable,stable-security,now 1.22.0-5+deb12u1 amd64 [已安装]
gstreamer1.0-libav/stable,now 1.22.0-2 amd64 [已安装]
gstreamer1.0-libcamera/stable,now 0.0.3-6 amd64 [已安装]
gstreamer1.0-packagekit/stable,now 1.2.6-5 amd64 [已安装]
gstreamer1.0-pipewire/stable,now 0.3.65-3 amd64 [已安装，自动]
gstreamer1.0-plugins-bad/stable-security,now 1.22.0-4+deb12u4 amd64 [已安装]
gstreamer1.0-plugins-base/stable,stable-security,now 1.22.0-3+deb12u1 amd64 [已安装]
gstreamer1.0-plugins-base/stable,stable-security,now 1.22.0-3+deb12u1 i386 [已安装，自动]
gstreamer1.0-plugins-good/stable,stable-security,now 1.22.0-5+deb12u1 amd64 [已安装]
gstreamer1.0-plugins-good/stable,stable-security,now 1.22.0-5+deb12u1 i386 [已安装，自动]
gstreamer1.0-plugins-ugly/stable,stable-security,now 1.22.0-2+deb12u1 amd64 [已安装]
gstreamer1.0-pulseaudio/stable,stable-security,now 1.22.0-5+deb12u1 amd64 [已安装]
gstreamer1.0-qt5/stable,stable-security,now 1.22.0-5+deb12u1 amd64 [已安装]
gstreamer1.0-qt6/stable,stable-security,now 1.22.0-5+deb12u1 amd64 [已安装]
gstreamer1.0-tools/stable,now 1.22.0-2 amd64 [已安装]
gstreamer1.0-x/stable,stable-security,now 1.22.0-3+deb12u1 amd64 [已安装]
gstreamer1.0-x/stable,stable-security,now 1.22.0-3+deb12u1 i386 [已安装，自动]

My CMakeLists.txt configuration is as follows:

# find_package
set(REQUIRED_LIBS
        Core Gui Widgets Multimedia MultimediaWidgets)
#target_link_libraries
set(REQUIRED_LIBS_QUALIFIED
        Qt6::Core Qt6::Gui Qt6::Widgets Qt6::Multimedia Qt6::MultimediaWidgets)

This is normal when I use Qt5 to play mp4.
What causes this and how can I fix it?
Thank you.