macOS : How deploy vlc3 to avoid libvlc_new crash at runtime

[amn]

Hi everybody,
I'm trying to use vlc3 (libvlc) with Qt(5.14) clang under MacOsx(10.15)
So I'm using vlc/doc/libvlc/QtPlayer
but at runtime I always have the message : Could not init libVLC
It's because libvlc_new(0,NULL) return nil !!

Trying change args to init vlc

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const char * const vlc_args[] = {"--verbose=2","--vout=macosx"}; vlcInstance = libvlc_new(sizeof(vlc_args) / sizeof(vlc_args[0]), vlc_args);

still return nil

pro file links libraries with :

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INCLUDEPATH += /Applications/VLC.app/Contents/MacOS/include LIBS += -L/Applications/VLC.app/Contents/MacOS/lib

then I try with LIBS += -L/opt/X11/lib -lX11 and without.
To be sure there is no @rpath problems in vlc libraries, I keep the tree structure of VLC.app by copying directly in build/qtvlc.app/Contents/MacOS/ :
VLC.app/Contents/Frameworks/
VLC.app/Contents/MacOS/lib/
VLC.app/Contents/MacOS/plugins/

I add @rpath to MacOS/qtvlc executable :

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sudo install_name_tool -delete_rpath /Users/amn/Qt/5.15.0/clang_64/lib /Users/amn/test-vlc/vlc-3.0/doc/libvlc/build/qtvlc.app/Contents/MacOS/qtvlc sudo install_name_tool -add_rpath @executable_path/lib/ /Users/amn/test-vlc/vlc-3.0/doc/libvlc/build/qtvlc.app/Contents/MacOS/qtvlc sudo install_name_tool -add_rpath @executable_path/plugins/ /Users/amn/test-vlc/vlc-3.0/doc/libvlc/build/qtvlc.app/Contents/MacOS/qtvlc

but libvlc_new(0,NULL) still return nil.

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Then If I'm trying to use libvlc (libvlcpp/vlcpp/*) in my own project, with the same deployment process, at runtime, libvlc instanciation crashes.

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const char * const vlc_args[] = {"--verbose=2","--vout=macosx"}; new VLC::Instance(sizeof(vlc_args) / sizeof(vlc_args[0]), vlc_args);

crash with the message :
libc++abi.dylib: terminating with uncaught exception of type std::runtime_error: Wrapping a NULL instance

I don't have this problem with vlc4 (no crash at runtime), but I can't see the video output with vlc4 even if the video is played (I hear the sound)
So, I'm trying with vlc3, but it crashes.

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If somebody can explain how deploy vlc3 in vlc/doc/libvlc/QtPlayer,
according to avoid libvlc_new(0,NULL) return nil,
it would be really appreciated.
Thanks a lot in advance.

[mfkl]

Can you share the setup of your directory tree (libvlc, libvlccore, plugins folder) please?

Have you tried to set the VLC_PLUGIN_PATH environment variable?

[amn]

Thanks for this advice, I'm setting VLC_PLUGIN_PATH by :

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QByteArray ba=QString("/Applications/VLC.app/Contents/MacOS/plugins").toUtf8(); qputenv("VLC_PLUGIN_PATH",ba);

and QtPlayer works fine ! Thanks a lot!
I don't see the video in my own project, which use libvlcpp (QtPlayer don't), but it concern a new post if necessary,
the runtime crash has disappeared.
Thanks again.

[Timothy Grove]

Curious, where did you place the code to set VLC_PLUGIN_PATH? In player.cpp:Mwindow? Having similar problem with QtPlayer.

[mfkl]

Curious, where did you place the code to set VLC_PLUGIN_PATH? In player.cpp:Mwindow? Having similar problem with QtPlayer.

anytime before the first libvlc call.