[SOLVED]libvlc crash on libvlc_new

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topix93
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[SOLVED]libvlc crash on libvlc_new

Postby topix93 » 04 Oct 2013 11:17

i'm trying to run a qt application based on libvlc but i get a segmentation fault on the line:

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m_vlcobj=libvlc_new(sizeof(vlc_args) / sizeof(vlc_args[0]), vlc_args);
this is the backtrace

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~"#0 0xb7fdd424 in __kernel_vsyscall ()\n" >~"#1 0xb6dd01df in __GI_raise (sig=6) at ../nptl/sysdeps/unix/sysv/linux/raise.c:64\n" >~"#2 0xb6dd3825 in __GI_abort () at abort.c:91\n" >~"#3 0xb6e0d39a in __libc_message (do_abort=2, fmt=0xb6f07aa8 \"*** glibc detected *** %s: %s: 0x%s ***\\n\") at ../sysdeps/unix/sysv/linux/libc_fatal.c:201\n" >~"#4 0xb6e17ee2 in malloc_printerr (action=<optimized out>, str=<optimized out>, ptr=0xb74bee9c) at malloc.c:5018\n" >~"#5 0xb6e1c56d in __GI___libc_realloc (oldmem=0xb74bee9c, bytes=32) at malloc.c:3021\n" >~"#6 0xb70ffe67 in QListData::realloc(int) () from /home/fardst/Qt5.1.1/5.1.1/gcc/lib/libQt5Core.so.5\n" >~"#7 0xb70fff4c in QListData::append(int) () from /home/fardst/Qt5.1.1/5.1.1/gcc/lib/libQt5Core.so.5\n" >~"#8 0xb70fffd3 in QListData::append() () from /home/fardst/Qt5.1.1/5.1.1/gcc/lib/libQt5Core.so.5\n" >~"#9 0xb70bb2c8 in ?? () from /home/fardst/Qt5.1.1/5.1.1/gcc/lib/libQt5Core.so.5\n" >~"#10 0xb70b94fd in ?? () from /home/fardst/Qt5.1.1/5.1.1/gcc/lib/libQt5Core.so.5\n" >~"#11 0xb70ba0d8 in ?? () from /home/fardst/Qt5.1.1/5.1.1/gcc/lib/libQt5Core.so.5\n" >~"#12 0xb70ba8ec in qMessageFormatString(QtMsgType, QMessageLogContext const&, QString const&) () from /home/fardst/Qt5.1.1/5.1.1/gcc/lib/libQt5Core.so.5\n" >~"#13 0xb70baa72 in ?? () from /home/fardst/Qt5.1.1/5.1.1/gcc/lib/libQt5Core.so.5\n" >~"#14 0xb70b8227 in ?? () from /home/fardst/Qt5.1.1/5.1.1/gcc/lib/libQt5Core.so.5\n" >~"#15 0xb70b8383 in ?? () from /home/fardst/Qt5.1.1/5.1.1/gcc/lib/libQt5Core.so.5\n" >~"#16 0xb70b894f in QMessageLogger::fatal(char const*, ...) const () from /home/fardst/Qt5.1.1/5.1.1/gcc/lib/libQt5Core.so.5\n" >~"#17 0xb72ae52f in QMetaType::registerNormalizedType(QByteArray const&, void (*)(void*), void* (*)(void const*), void (*)(void*), void* (*)(void*, void const*), int, QFlags<QMetaType::TypeFlag>, QMetaObject const*) () from /home/fardst/Qt5.1.1/5.1.1/gcc/lib/libQt5Core.so.5\n" >~"#18 0xb72ae5e7 in QMetaType::registerType(char const*, void (*)(void*), void* (*)(void const*), void (*)(void*), void* (*)(void*, void const*), int, QFlags<QMetaType::TypeFlag>, QMetaObject const*) () from /home/fardst/Qt5.1.1/5.1.1/gcc/lib/libQt5Core.so.5\n" >~"#19 0xb72ae6a7 in QMetaType::registerType(char const*, void (*)(void*), void* (*)(void const*)) () from /home/fardst/Qt5.1.1/5.1.1/gcc/lib/libQt5Core.so.5\n" >~"#20 0xb0a9ba8e in ?? () from /usr/lib/i386-linux-gnu/libQtGui.so.4\n" >~"#21 0xb0899f40 in ?? () from /usr/lib/i386-linux-gnu/libQtGui.so.4\n" >~"#22 0xb7feceab in call_init (env=0xbffff78c, argv=0xbffff784, argc=1, l=<optimized out>) at dl-init.c:85\n" >~"#23 call_init (l=<optimized out>, argc=1, argv=0xbffff784, env=0xbffff78c) at dl-init.c:35\n" >~"#24 0xb7fecf94 in _dl_init (main_map=<optimized out>, argc=1, argv=0xbffff784, env=0xbffff78c) at dl-init.c:134\n" >~"#25 0xb7ff0fa6 in dl_open_worker (a=0xbfffeea0) at dl-open.c:549\n" >~"#26 0xb7fecccf in _dl_catch_error (objname=0xbfffeec4, errstring=0xbfffeec8, mallocedp=0xbfffeecf, operate=0xb7ff0c40 <dl_open_worker>, args=0xbfffeea0) at dl-error.c:178\n" >~"#27 0xb7ff07f4 in _dl_open (file=0x8378450 \"/usr/lib/vlc/plugins/gui/libqt4_plugin.so\", mode=-2147483647, caller_dlopen=0xb6d3d1a0, nsid=-2, argc=1, argv=0xbffff784, env=0xbffff78c) at dl-open.c:639\n" >~"#28 0xb65e3be9 in dlopen_doit (a=0xbffff070) at dlopen.c:67\n" >~"#29 0xb7fecccf in _dl_catch_error (objname=0x8055f7c, errstring=0x8055f80, mallocedp=0x8055f78, operate=0xb65e3b50 <dlopen_doit>, args=0xbffff070) at dl-error.c:178\n" >~"#30 0xb65e433a in _dlerror_run (operate=0xb65e3b50 <dlopen_doit>, args=0xbffff070) at dlerror.c:164\n" >~"#31 0xb65e3c97 in __dlopen (file=0x8378450 \"/usr/lib/vlc/plugins/gui/libqt4_plugin.so\", mode=1) at dlopen.c:88\n" >~"#32 0xb6d3d1a0 in module_Load (p_this=0x829bf30, psz_file=0x8378450 \"/usr/lib/vlc/plugins/gui/libqt4_plugin.so\", p_handle=0xbffff0ec, lazy=true) at posix/plugin.c:62\n" >~"#33 0xb6d1e931 in module_InitDynamic (obj=0x829bf30, path=0x8378450 \"/usr/lib/vlc/plugins/gui/libqt4_plugin.so\", fast=true) at modules/bank.c:536\n" >~"#34 0xb6d1ec78 in AllocatePluginFile (st=0xbffff158, relpath=0x8376d68 \"gui/libqt4_plugin.so\", abspath=0x8378450 \"/usr/lib/vlc/plugins/gui/libqt4_plugin.so\", bank=0xbffff2f0) at modules/bank.c:479\n" >~"#35 AllocatePluginDir (bank=0xbffff2f0, maxdepth=3, absdir=0x8376d48 \"/usr/lib/vlc/plugins/gui\", reldir=0x836d448 \"gui\") at modules/bank.c:440\n" >~"#36 0xb6d1ebd3 in AllocatePluginDir (bank=0xbffff2f0, maxdepth=4, absdir=0x82ae8a8 \"/usr/lib/vlc/plugins\", reldir=0x0) at modules/bank.c:444\n" >~"#37 0xb6d1ef54 in AllocatePluginPath (p_this=0x829bf30, path=0x82ae8a8 \"/usr/lib/vlc/plugins\", mode=CACHE_USE) at modules/bank.c:353\n" >~"#38 0xb6d1f63a in AllocateAllPlugins (p_this=0x829bf30) at modules/bank.c:282\n" >~"#39 module_LoadPlugins (obj=0x829bf30) at modules/bank.c:189\n" >~"#40 0xb6c9aa93 in libvlc_InternalInit (p_libvlc=0x829bf30, i_argc=6, ppsz_argv=0xbffff570) at libvlc.c:247\n" >~"#41 0xb7faa0cb in libvlc_new (argc=5, argv=0xbffff604) at core.c:59\n" >~"#42 0x0804cc4b in Player::Player (this=0xbffff6a0) at ../libVlc/Player.cpp:71\n" >~"#43 0x0804bfa8 in main (argc=1, argv=0xbffff784) at ../libVlc/main.cpp:8\n"
and this is the class:

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#include "Player.h" #include <QtXml/QDomDocument> #include <QVBoxLayout> #include <QPushButton> #include <QSlider> #include <QTimer> #include <QFrame> #include <QEvent> #include <QMouseEvent> #include <QApplication> #include <QPainter> #include <QMenuBar> #include <QAction> #include <QMainWindow> #include <QFileDialog> #include <QDebug> #include <QFile> #include <iostream> #include <stdio.h> const QEvent::Type VLC_EVENT_TYPE = (QEvent::Type)5001; class QUpdatePosEvent:public QEvent { public: QUpdatePosEvent(int newPos):QEvent(VLC_EVENT_TYPE){m_newPos = newPos;} int m_newPos; }; Player::Player() : QWidget() { QMenuBar* menubar=new QMenuBar; //preparation of the vlc command const char * vlc_args[] = { "-I", "dummy", /* Don't use any interface */ "--ignore-config", /* Don't use VLC's config */ "--extraintf=logger", //log anything "--verbose=2", //be much more verbose then normal for debugging purpose }; m_video_wnd=new QFrame(this); m_volume_level=new QSlider(Qt::Horizontal,this); m_volume_level->setMaximum(100); // Note: if you use streaming, there is no ability to use the position slider m_video_position=new QSlider(Qt::Horizontal,this); m_video_position->setMaximum(POSITION_RESOLUTION); QVBoxLayout *layout = new QVBoxLayout; layout->addWidget(menubar); layout->addWidget(m_video_wnd); layout->addWidget(m_video_position); layout->addWidget(m_volume_level); setLayout(layout); QMenu *fileMenu = new QMenu("&File"); QAction *fileAction = new QAction("Open..", this); fileAction->setShortcut(Qt::CTRL + Qt::Key_O); fileMenu->addAction(fileAction); fileMenu->addSeparator(); fileMenu->addAction("Close", QApplication::instance(), SLOT(quit()), Qt::CTRL + Qt::Key_X); QMenu *aboutMenu = new QMenu("&About"); aboutMenu->addAction("About"); connect(fileAction, SIGNAL(triggered()), this, SLOT(menuOpen())); menubar->addMenu(fileMenu); menubar->addMenu(aboutMenu); m_vlcobj=libvlc_new(sizeof(vlc_args) / sizeof(vlc_args[0]), vlc_args); m_player = libvlc_media_player_new (m_vlcobj ); connect(m_video_position, SIGNAL(sliderMoved(int)), this, SLOT(changePosition(int))); connect(m_volume_level, SIGNAL(sliderMoved(int)), this, SLOT(changeVolume(int))); libvlc_event_manager_t * evtManager; evtManager = libvlc_media_player_event_manager(m_player); libvlc_event_attach(evtManager, libvlc_MediaPlayerPositionChanged, (libvlc_callback_t)onVlcEvent, this); libvlc_event_attach(evtManager,libvlc_MediaPlayerEndReached, (libvlc_callback_t)onVlcEvent,this); libvlc_event_attach(evtManager,libvlc_MediaPlayerStopped, (libvlc_callback_t)onVlcEvent,this); #if defined(Q_OS_WIN) libvlc_media_player_set_hwnd(m_player, m_video_wnd->winId() ); #else libvlc_media_player_set_xwindow(m_player, (int)(m_video_wnd->winId()) ); #endif menuOpen(); } Player::~Player() { libvlc_media_player_stop (m_player); libvlc_media_player_release (m_player); libvlc_release (m_vlcobj); } int Player::createConfigFile(QString config_path) { if (QFile::exists(config_path)==false) { std::cout << __FUNCTION__ << " create sample configuration file " << (const char*)config_path.toLatin1()<<std::endl; QFile file(config_path); QDomDocument doc( "qtvlc" ); QDomElement root = doc.createElement( "qtvlc" ); doc.appendChild( root ); { QDomElement tag = doc.createElement("aspect_ratio"); root.appendChild(tag); QDomText t = doc.createTextNode("4:3"); tag.appendChild(t); } { QDomElement tag = doc.createElement("crop_geometry"); root.appendChild(tag); QDomText t = doc.createTextNode("512x384+64+48"); tag.appendChild(t); } if( !file.open( QIODevice::WriteOnly ) ) { std::cout << __FUNCTION__ << " failed to save file " << (const char*)config_path.toLatin1()<<std::endl; return __LINE__; } QTextStream ts( &file ); ts << doc.toString(); file.close(); } return 0; } void Player::playFile(QString media_path) { m_media = libvlc_media_new_path (m_vlcobj, media_path.toUtf8()); libvlc_media_player_set_media (m_player, m_media); QString config_path("qtvlc.xml"); createConfigFile(config_path); QFile file(config_path); QDomDocument doc; QString errorStr; int errorLine =0; int errorCol=0; if(!doc.setContent(&file,true,&errorStr,&errorLine,&errorCol)) { std::cout<<__FUNCTION__ << " error "<<(const char*)errorStr.toLatin1() << " at line " << errorLine << " character " << errorCol <<std::endl; return; } { QDomNodeList lst = doc.elementsByTagName("aspect_ratio"); if (lst.count()>0) { QDomNode node=lst.at(0); QString text=node.toElement().text(); std::cout<<"node "<<(const char*)node.nodeName().toLatin1() << " is " << (const char*)text.toLatin1() << std::endl; std::cout<<"set "<<(const char*)node.nodeName().toLatin1()<<std::endl; libvlc_video_set_aspect_ratio(m_player, (const char*)text.toLatin1()); // 16:9 } } { QDomNodeList lst = doc.elementsByTagName("crop_geometry"); if (lst.count()>0) { QDomNode node=lst.at(0); QString text=node.toElement().text(); std::cout<<"node "<<(const char*)node.nodeName().toLatin1() << " is " << (const char*)text.toLatin1() << std::endl; std::cout<<"set "<<(const char*)node.nodeName().toLatin1()<<std::endl; libvlc_video_set_crop_geometry(m_player, (const char*)text.toLatin1()); // 512x384+64+48 } } libvlc_media_player_play (m_player ); } void Player::changeVolume(int newVolume) { libvlc_audio_set_volume (m_player,newVolume ); } void Player::changePosition(int newPosition) { libvlc_media_t *curMedia = libvlc_media_player_get_media (m_player); if (curMedia == NULL) return; float pos=(float)(newPosition)/(float)POSITION_RESOLUTION; libvlc_media_player_set_position (m_player, pos); raise(); } void Player::onVlcEvent( const libvlc_event_t * pEvt, void * pData ) { std::cout << __FUNCTION__ << " event type " << pEvt->type << std::endl; int siderPos = 0; if(pEvt->type == libvlc_MediaPlayerPositionChanged) { if(pData) { Player* pp = (Player*)pData; int64_t iLength=libvlc_media_player_get_length(pp->m_player); int64_t iTime=libvlc_media_player_get_time(pp->m_player); siderPos=iLength ? static_cast<int>((static_cast<double>(iTime)/static_cast<double>(iLength) * POSITION_RESOLUTION)) : 0; } } if (pEvt->type == libvlc_MediaPlayerEndReached) siderPos = POSITION_RESOLUTION; QApplication::postEvent( (QWidget*)pData, new QUpdatePosEvent(siderPos)); } void Player::customEvent( QEvent *e ) { if (e->type() == VLC_EVENT_TYPE) { QUpdatePosEvent* posev = (QUpdatePosEvent*)e; m_video_position->setValue(posev->m_newPos); int volume=libvlc_audio_get_volume (m_player); m_volume_level->setValue(volume); } } void Player::mouseMoveEvent( QMouseEvent * event ) { } void Player::mousePressEvent( QMouseEvent * event ) { m_mouse_pos = event->pos(); } void Player::mouseReleaseEvent( QMouseEvent * event ) { QPoint mouse_pos2 = event->pos(); QPoint mouse_pos1 = m_mouse_pos; m_mouse_pos.setX(-1); m_mouse_pos.setY(-1); // libvlc_set_crop_geometry(mp, "512x384+64+48"); //option[0] = "--vout-filter"; //option[1] = "crop"; //option[2] = "--custom-crop-ratios=512x384+64+48,384x288+128+96,256x192+192+144,128x96+256+192,64x48+288+216"; // http://forum.videolan.org/viewtopic.php?f=32&t=88913 //libvlc_video_set_crop_geometry(m_player, "left+top+right+bottom"); } void Player::paintEvent( QPaintEvent * event ) { int margin = 10; int topRectHeight = 50; QPainter painter(this); QColor color(10,150,100); painter.setBrush(QBrush(color)); painter.drawRect(0,0,width(),height()); QRect topRect(margin,margin,width()-2*margin,topRectHeight); painter.drawRect(topRect); painter.drawText(width()/3,topRectHeight/2+margin,"test paintEvent"); QRect downRect(margin,topRectHeight+2*margin,width()-2*margin, height()-topRectHeight-3*margin); painter.drawRect(downRect); } void Player::menuOpen() { std::cout << __FUNCTION__ << std::endl; QString file = QFileDialog::getOpenFileName(this, tr("Open video"), "/d4/bin/m", "Video (*.avi *.mp4 *.mpg)"); if (file.length()) { playFile(file); } }


and the file header:

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#ifndef PLAYER_H #define PLAYER_H #include <vlc/vlc.h> #include <QWidget> class QVBoxLayout; class QPushButton; class QTimer; class QFrame; class QSlider; class QMouseEvent; #define POSITION_RESOLUTION 100 struct libvlc_event_t; class Player : public QWidget/*QWidget*/ { Q_OBJECT QSlider *m_video_position; QSlider *m_volume_level; QFrame *m_video_wnd; libvlc_instance_t *m_vlcobj; libvlc_media_player_t *m_player; libvlc_media_t *m_media; QPoint m_mouse_pos; public: Player(); ~Player(); static void onVlcEvent(const libvlc_event_t * pEvt, void * pData); protected: void mouseMoveEvent( QMouseEvent * event ); void mousePressEvent( QMouseEvent * event ); void mouseReleaseEvent( QMouseEvent * event ); void paintEvent( QPaintEvent * event ); public slots: void playFile(QString file); void changeVolume(int newVolume); void changePosition(int newPosition); void customEvent(QEvent *e); void menuOpen(); private: int createConfigFile(QString config_path); }; #endif // PLAYER_H
what could be the problem?

topix93
Blank Cone
Blank Cone
Posts: 12
Joined: 04 Oct 2013 11:04

Re: [SOLVED]libvlc crash on libvlc_new

Postby topix93 » 04 Oct 2013 12:18

solved after download the source code of vlc-2.0.8 and building it

Rémi Denis-Courmont
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Developer
Posts: 15257
Joined: 07 Jun 2004 16:01
VLC version: master
Operating System: Linux
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Re: [SOLVED]libvlc crash on libvlc_new

Postby Rémi Denis-Courmont » 04 Oct 2013 17:25

LibVLC must be compiled against Qt5 (or without Qt altogether) if you want to use Qt5 outside. This is a Qt limitation.
Rémi Denis-Courmont
https://www.remlab.net/
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