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Posted: **13 Oct 2020 16:58**

i'm trying to use vlc4.0 (libvlc and libvlcpp) with Qt(5.14) clang under MacOsx(10.15)
i tried several methods, and i would like some informations about solve them

from https://github.com/videolan/vlc, compilation run fine
that extract libvlc.12.dylib, libvlccore.9.dylib, and /plugins/*/

a) There are two examples of use
i) vlc/doc/libvlc/QtGL
at run time, there is 2 error log messages, the second make crash:
QOpenGLShader::compile(Fragment): ERROR: 0:9: ';' : syntax error: syntax error
Assertion failed: (psz_mrl), function InputSourceInit, file vlc/extras/package/macosx/../../../src/input/input.c, line 2568.
>>> Question : Should we insist in this direction, and if so, how?

ii) vlc/doc/libvlc/QtPlayer
X11 is necessary (from https://www.xquartz.org/)
integraton resumed : libvlc_media_player_set_nsobject(vlcPlayer, (void *)videoWidget->winId());
at excecution, I have the following error:
dyld: Symbol not found: _gll_noop
Referenced from: /System/Library/Frameworks/OpenGL.framework/Versions/A/OpenGL
that I solve by copying the dylib missing in Contents/ (Frameworks/ [with Frameworks/plugins/] and PlugIns/)

then, with

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vlcInstance = libvlc_new(0, NULL); (in player.cpp)

video is playing (I hear the sound) but nothing is displayed, black screen :

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[00007ff3c20a6850] macosx window error: Cannot create vout as Mac OS X interface was not found
[00007ff3be913a00] videotoolbox decoder: Using Video Toolbox to decode 'h264'
[00007ff3c20992c0] main video output error: video output display creation failed
[00007ff3be913a00] videotoolbox decoder error: decoder failure, Abort.
[h264 @ 0x7ff3bf0fd400] get_buffer() failed
[h264 @ 0x7ff3bf0fd400] thread_get_buffer() failed
[h264 @ 0x7ff3bf0fd400] decode_slice_header error
[h264 @ 0x7ff3bf0fd400] no frame!

>>> Question : Why the video is not showing?

and with,

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const char * const vlc_args[] = {
        	      		"--verbose=4"
        	    		,"--vout=macosx"
        	    		//,"--no-plugins-cache"
    			};
    			vlcInstance = libvlc_new(sizeof(vlc_args) / sizeof(*vlc_args), vlc_args);

video is playing (I hear the sound) but nothing is displayed, black screen again :

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[00007fea806ada50] macosx window error: Cannot create vout as Mac OS X interface was not found
[00007fea82419c40] main video output error: video output display creation failed
[00007fea81872600] videotoolbox decoder error: decoder failure, Abort.

>>> Question : "--vout=macosx" does not seem to work, what initialization should be specified for a correct vault?

b) Integration into my own project works (without X11), but nothing is displayed, black screen again.
Changing @rpath of 2 libraries to be compatible with my tree structure
echo $RPWD | sudo -S install_name_tool -add_rpath @executable_path/../Frameworks plugins/gui/libmacosx_plugin.dylib
echo $RPWD | sudo -S install_name_tool -add_rpath @executable_path/../Frameworks plugins/audio_filter/libebur128_plugin.dylib

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const char * const vlc_args[] = {
              "--verbose=2"
            ,"--vout=macosx"
            //,"--no-plugins-cache"
};

QScreen *screen=QGuiApplication::primaryScreen();
_videoWindow = new QWindow(screen);
_videoWidget=QWidget::createWindowContainer(_videoWindow,this);
QVBoxLayout *layout = new QVBoxLayout;
layout->addWidget(_videoWidget);
setLayout(layout);
_vlcinstance = new VLC::Instance(sizeof(vlc_args) / sizeof(vlc_args[0]), vlc_args);
_m = new VLC::Media(*_vlcinstance, file.toLatin1().data(), VLC::Media::FromLocation);
_mp = new VLC::MediaPlayer(*_m);
_mp->eventManager() ...
int windid = _videoWidget->winId();
_mp->setNsobject((void*)windid);

_mp->play();

I hear the video sound, and I receive the events, but vlcdebug says :

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[00007f8bfa8e8990] main libvlc debug: VLC media player - 4.0.0-dev Otto Chriek
[00007f8bfa8e8990] main libvlc debug: configured with /Users/amn/vlc/extras/package/macosx/../../../configure  '--prefix=/' '--enable-macosx' '--enable-merge-ffmpeg' '--enable-osx-notifications' '--enable-faad' '--enable-flac' '--enable-theora' '--enable-shout' '--enable-ncurses' '--enable-twolame' '--enable-libass' '--enable-macosx-avfoundation' '--disable-skins2' '--disable-xcb' '--disable-caca' '--disable-pulse' '--disable-sdl-image' '--disable-vnc' '--build=x86_64-apple-darwin19' '--host=x86_64-apple-darwin19' '--with-macosx-version-min=10.11' '--with-macosx-sdk=/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk' 'build_alias=x86_64-apple-darwin19' 'host_alias=x86_64-apple-darwin19' 'CC=/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang' 'CFLAGS=-g' 'LDFLAGS=' 'CXX=/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang++' 'CXXFLAGS=-g' 'OBJC=/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang' 'OBJCFLAGS=-g'
[00007f8bfa8e8990] main libvlc debug: CPU has capabilities MMX MMXEXT SSE SSE2 SSE3 SSSE3 SSE4.1 SSE4.2 FPU 

[h264 @ 0x7f8bf9d06800] Reinit context to 1280x720, pix_fmt: yuv420p
[h264 @ 0x7f8bf9d06800] get_buffer() failed
[h264 @ 0x7f8bf9d06800] thread_get_buffer() failed
[h264 @ 0x7f8bf9d06800] decode_slice_header error
[h264 @ 0x7f8bf9d06800] no frame!

>>> Question : how to correctly create _videoWidget and view the video?

thanks for your help.

Posted: **15 Oct 2020 10:07**

Forgotten to tell you, the b) point is build with libvlcpp (https://code.videolan.org/videolan/libvlcpp)

Posted: **16 Oct 2020 15:50**

also trying, but obtain the same black screen:

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NSView *video = [[NSView alloc] init];
QMacCocoaViewContainer *container = new QMacCocoaViewContainer(video, _videoWidget);
_mp->setNsobject(video);

or:

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NSView *nsview = ( __bridge NSView * )reinterpret_cast<void *>( windid );
_mp->setNsobject(nsview);

Posted: **21 Oct 2020 18:14**

With this code :

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NSWindow *window = [[[NSApplication sharedApplication] windows] objectAtIndex:0];
NSView *contentView = [window contentView];
NSView *test = [[NSView alloc] initWithFrame:CGRectMake(0,0,150,150)];
[test setWantsLayer:YES];
test.layer.backgroundColor=NSColor.blueColor.CGColor;
[contentView addSubview:test positioned:NSWindowAbove relativeTo:nil];
_mp->setNsobject(test);
[test release];

I see a blue square, so NSView is correctly initialized, but the video is again not visible.

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