The VideoLAN Forums

I am using QT 4.7 and VLC 1.1.4
When I was trying to create an instance of the libvlc, I got a NULL pointer, why?

Here is the example of the creation:
libvlc_instance_t *pVLCInstance = libvlc_new (0, NULL);

I also tried the following, still not luck:
const char * const vlc_args[] = {
"--no-media-library",
"--reset-plugins-cache",
"--no-stats",
"--no-osd",
"--no-video-title-show"};

libvlc_instance_t *pVLCInstance = libvlc_new (sizeof(vlc_args) / sizeof(vlc_args[0]), vlc_args);

Any clue for me? What are the default arguments that I can use without any conflict? Thanks.

you should look at the logs when you run your program.
Maybe vlc can't find any modules.

Could you tell me where the log is? I went the debug from QT as well as from VS2008. Will it still produce the log? Thanks.

I don't know about windows. Maybe you can run your program from a console ?

I can run vlc from the command console from Windows fine.
I can try to build vlc on linux side, since I am more of a Windows person, the steps for building the vlc on linux seems rather confusing to me.

I want to build an application using QT. I thought the first step is to create a new instance of VLC. But it failed as soon as I called "libvlc_new". Can you provide me with any example using vlc 1.1.4? Thanks.

libvlc_instance_t *pVLCInstance = libvlc_new (0, NULL);
should work.
If it's not the case, you'll need to look at the logs.

libvlc_instance_t *pVLCInstance = libvlc_new (0, NULL);
should work.
If it's not the case, you'll need to look at the logs.

Again, where is the log? How do I set the log up?

In your console.
If not I can't help you because I don't know windows.

Is there another way to check error status from the libvlc API without the log, something similar to errorno, or exception used to older version of libvlc?

libvlc_instance_t *vlcInstance = libvlc_new( 0, NULL );
should be the first line of libvlc codes before anything else, right?

yes it should be the first line of code. i had the same problem as you but i got it fixed by putting the libvlc.lib , libvlc.dll,libvlccore.dll in by Debug folder and then point to the path of the libvlc.lib in my project properties . Also make sure you are pointing to all the other folders that VLC needs in order for it to launch.

Folders:
vlc-1.1.4\ ( main folder that contains everthing )
sdk\include\vlc\
sdk\include\vlc\plugins
sdk\lib
sdk\lib\pkgconfig

I had it working with VS2008 MFC C++ to decode an H.264 stream via UDP.

Hi all,

Sorry for digging out this topic, but I have exactly the same problem : the libvlc_new returns me a NULL pointer...
I tried to copy the libvlc.lib libvlc.dll and libvlccore.ddl on my Debug folder, but nothing changed : NULL pointer...

I was wondering if it's possible that the problem come from using the VLC lib on an x64 architecture ? I'm using Windows 7 Pro and VLC sdk 1.1.11

An other question that could help me to find a way to solve this problem: what does that change to put the lib/dll in the Debug folder (I mean instead of putting the containing folder in the bin path ?)

Thanks in advance for potential help !

Have you looked at the log? Any error messages?

HI I also have the similar, i am working mac using xcode trying to run sample vlc program for vlc 2.0.1. But when i am trying to create libvlc instance by
minst=libvlc_new(0,NULL);
its returning NULL. in the logs error message says [ main libvlc error : No Plugins found ] since from 2.0 --plugin-path option is also removed what should i do???
I tried to put plugins folder under current project directory but still the same error without any change. Anybody has any idea how to solve that.

regards,
nefster