如何使用LibVLC与Qt 5 [英] How to use LibVLC with Qt 5

问题描述

我试图在Qt 5程序中使用LibVLC打开一个VLC实例和播放视频。
以下代码来自 https://wiki.videolan.org/LibVLC_Tutorial/
我在使用Linux。

I'm trying to use LibVLC in a Qt 5 program to open a VLC instance and play a video. The following code comes from https://wiki.videolan.org/LibVLC_Tutorial/ I'm using Linux.

.pro：

TEMPLATE = app
TARGET = projectLoic
INCLUDEPATH += . vlc
QT += widgets
# Input
HEADERS += 
SOURCES += main.cpp
LIBS +=-lvlc

main：

#include <vlc/vlc.h>
#include <QApplication>

int main(int argc, char* argv[])
{
    QApplication app(argc, argv);


    libvlc_instance_t * inst;
    libvlc_media_player_t *mp;
    libvlc_media_t *m;

         // Load the VLC engine
         inst = libvlc_new(0, NULL);

         // Create a new item

         m = libvlc_media_new_path (inst, "/home/........mp3");

         // Create a media player playing environement
         mp = libvlc_media_player_new_from_media (m);

         // play the media_player
         libvlc_media_player_play (mp);

     return app.exec();
}

编译正常。但是程序立即崩溃，当我构建它（与Qt Creator）。任何想法？

The compilation is fine. But the program immediatly crashes when I build it (with Qt Creator). Any idea?

非常感谢

推荐答案

崩溃。最好是获得VLC源代码来追溯这个问题。在初始化libVLC时传递选项'--verbose = 2'也可以帮助。

Many things could cause this crash. The best is to get VLC source code to trace back the issue. Passing the option '--verbose=2' when initializing libVLC can help as well.

在我的情况下，崩溃的原因是由于这个bug的ubuntu包of vlc：
https://bugs.launchpad.net/ ubuntu / + source / vlc / + bug / 1328466

In my case the cause of the crash was due to this bug in the ubuntu package of vlc: https://bugs.launchpad.net/ubuntu/+source/vlc/+bug/1328466

当调用libvlc_new（）vlc模块及其依赖库加载到内存时。 LibVLC的qt模块正在搜索Qt4共享对象，而不是Qt5（手动安装）。

When calling libvlc_new() vlc modules and their dependent libraries are loaded into memory. The qt module of LibVLC was searching for Qt4 shared objects instead of Qt5 (manually installed).

解决方案是重建模块缓存，过时指向Qt4二进制。您可以在命令行中重置它：

The solution was to rebuild the module cache which was outdated an pointing to Qt4 binaries. You can reset it on the command line:

sudo /usr/lib/vlc/vlc-cache-gen -f /usr/lib/vlc/plugins/

或传递给vlc选项：

--reset-plugins-cache

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