QVideoFrame::toImage gives corrupt images when no RHI backend is present

********* Start testing of tst_qvideoframecolormanagement *********
Config: Using QtTest library 6.6.2, Qt 6.6.2 (x86_64-little_endian-lp64 shared (dynamic) release build; by GCC 11.3.0), unknown unknown
PASS   : tst_qvideoframecolormanagement::initTestCase()
QWARN  : tst_qvideoframecolormanagement::toImage_savesWithCorrectColors(umbrellas.jpg_nv12_BT601_Video) QRhi* initializeRHI(QRhi*) : No RHI backend. Using CPU conversion.
FAIL!  : tst_qvideoframecolormanagement::toImage_savesWithCorrectColors(umbrellas.jpg_nv12_BT601_Video) The computed value is expected to be less than the baseline, but is not
   Computed (ratioAboveThreshold): 0.5815503003
   Baseline (0.01)               : 0.01
   Loc: [/tmp/guix-build-qtmultimedia-6.6.2.drv-0/qtmultimedia-everywhere-src-6.6.2/tests/auto/unit/multimedia/qvideoframecolormanagement/tst_qvideoframecolormanagement.cpp(557)]
FAIL!  : tst_qvideoframecolormanagement::toImage_savesWithCorrectColors(umbrellas.jpg_nv12_BT601_Full) The computed value is expected to be less than the baseline, but is not
   Computed (ratioAboveThreshold): 0.98216966967
   Baseline (0.01)               : 0.01
   Loc: [/tmp/guix-build-qtmultimedia-6.6.2.drv-0/qtmultimedia-everywhere-src-6.6.2/tests/auto/unit/multimedia/qvideoframecolormanagement/tst_qvideoframecolormanagement.cpp(557)]
FAIL!  : tst_qvideoframecolormanagement::toImage_savesWithCorrectColors(umbrellas.jpg_nv12_BT709_Video) The computed value is expected to be less than the baseline, but is not
   Computed (ratioAboveThreshold): 0.826388888889
   Baseline (0.01)               : 0.01
   Loc: [/tmp/guix-build-qtmultimedia-6.6.2.drv-0/qtmultimedia-everywhere-src-6.6.2/tests/auto/unit/multimedia/qvideoframecolormanagement/tst_qvideoframecolormanagement.cpp(557)]
FAIL!  : tst_qvideoframecolormanagement::toImage_savesWithCorrectColors(umbrellas.jpg_nv12_BT709_Full) The computed value is expected to be less than the baseline, but is not
   Computed (ratioAboveThreshold): 0.978744369369
   Baseline (0.01)               : 0.01
   Loc: [/tmp/guix-build-qtmultimedia-6.6.2.drv-0/qtmultimedia-everywhere-src-6.6.2/tests/auto/unit/multimedia/qvideoframecolormanagement/tst_qvideoframecolormanagement.cpp(557)]
FAIL!  : tst_qvideoframecolormanagement::toImage_savesWithCorrectColors(umbrellas.jpg_nv12_AdobeRgb_Video) The computed value is expected to be less than the baseline, but is not
   Computed (ratioAboveThreshold): 0.97240990991
   Baseline (0.01)               : 0.01
   Loc: [/tmp/guix-build-qtmultimedia-6.6.2.drv-0/qtmultimedia-everywhere-src-6.6.2/tests/auto/unit/multimedia/qvideoframecolormanagement/tst_qvideoframecolormanagement.cpp(557)]

[...]

FAIL!  : tst_qvideoframecolormanagement::toImage_savesWithCorrectColors(umbrellas.jpg_422p_BT2020_Video) T
he computed value is expected to be less than the baseline, but is not
   Computed (ratioAboveThreshold): 0.98704954955
   Baseline (0.01)               : 0.01
   Loc: [/tmp/guix-build-qtmultimedia-6.6.2.drv-0/qtmultimedia-everywhere-src-6.6.2/tests/auto/unit/multim
edia/qvideoframecolormanagement/tst_qvideoframecolormanagement.cpp(557)]
FAIL!  : tst_qvideoframecolormanagement::toImage_savesWithCorrectColors(umbrellas.jpg_422p_BT2020_Full) Th
e computed value is expected to be less than the baseline, but is not
   Computed (ratioAboveThreshold): 0.996809309309
   Baseline (0.01)               : 0.01
   Loc: [/tmp/guix-build-qtmultimedia-6.6.2.drv-0/qtmultimedia-everywhere-src-6.6.2/tests/auto/unit/multim
edia/qvideoframecolormanagement/tst_qvideoframecolormanagement.cpp(557)]
PASS   : tst_qvideoframecolormanagement::cleanupTestCase()
Totals: 2 passed, 64 failed, 0 skipped, 0 blacklisted, 947ms
********* Finished testing of tst_qvideoframecolormanagement *********
Images with differences were found. The output images with differences can be found in "/tmp/guix-build-qtmultimedia-6.6.2.drv-0/tst_qvideoframecolormanagement-tQkcOC" . Review the images and if the differences are expected, please update the testdata with the new output images
Fontconfig error: No writable cache directories
Fontconfig error: No writable cache directories
CMake Error at tst_qvideoframecolormanagementWrapperRelWithDebInfo.cmake:18 (message):

  /tmp/guix-build-qtmultimedia-6.6.2.drv-0/build/tests/auto/unit/multimedia/qvideoframecolormanagement/tst_qvideoframecolormanagement
  execution failed with exit code 64.