We are building Qt-6.5.4 with the WebEngine and we now need to check that proprieraty video codec are effectively disabled in the webengine.

We left thee 'webengine-proprietary-codecs' option to its default value (no).

After the build on Linux, I check some ffmpeg symbols and found some:

% nm libQt6WebEngineCore.so.6.5.4 | grep -i avformat_alloc_context
0000000005765190 t avformat_alloc_context
nm libQt6WebEngineCore.so.6.5.4 | grep -i avcodec_receive_frame
0000000005750640 t avcodec_receive_frame

I checked for vpx presence and found some symbols too.

So, I checked gyp files using the target "//third_party/libvpx” . A priori, this target is link to the variable media_use_libvpx.
I search for the gyp variable media_use_libvpx and found that src/3rdparty/chromium/media/media_options.gni is defining this variable to true and was not able to find something setting this variable to false (excepted on mobile platform).

So my question is: how can I confirm that qt-6.5.4 with webengine is not including proprietary codecs ?