[vlc-devel] CLI Bindings : AccessViolationException on player

[Damien]

>
> 2009/12/9 Developer <developer at noknok.net>
>
>> Ok, from a command line:
>>
>> vlc -I dummy -vvv --extraintf=logger --logfile=z:\ffmpeg\VlcLog.txt
>>  "z:\tempdata\sin.avi"
>>
>
>   The program starts, the video plays (directx window) and the log file is
> filled with a lot of text.
>
>  When launching my program directly from commandline (microsoft
> framework), instanciating VLC with same parameters, log file is not created
> and the media video seems to be a smiley
>
> What do you mean by running directly from commandline (mircrosoft
> framework)?   Are you meaning executing a SHELL COMMAND from within say C#?
>

To test, here what I have done :

Start, Execute, "cmd"

cd /d "C:\program file\videolan\vlc"
vlc -I dummy -vvv --extraintf=logger --logfile=D:\VlcLog.txt  "D:\a.avi"

--> Video is played inside a Directx window, vlc opens its own log console
window aside.

Then I copy my program into vlc dir.
My code :
--8<----8<----8<----8<----8<--
                System.Console.WriteLine("OS is {0} version {1}",
Environment.OSVersion.Platform, Environment.OSVersion.VersionString);
                string video = @"d:\a.avi";
                string[] vlcargs = new string[]
                {
                    "--no-plugins-cache",
                    "-I", "dummy",                      /* no interface */
                    "--ignore-config",            /* don't use/overwrite the
config */
                    "-vvv",
                    "--extraintf=logger",
                    "--logfile=D:\\VlcLog.txt",
                    video,
                };

                using (VLC instance = new VLC(vlcargs))
                {
                    Console.WriteLine("Waiting for 'Enter' key press to
quit...");
                    System.Console.ReadLine();
                }
--8<----8<----8<----8<----8<--

Nothing happen : I see the "waiting" message, I see some log messages (in
same console window), but until I press enter, there is no more feedback, no
other window, no CPU activity...
Even if I replace the "Console.Readline()" with "instance.Run()" it doesn't
change anything...

Compiled with VS2008 (target is framework 2.0), Windows 7 Ultimate x86,
running in either debugger or using commandline, strings seem not to be
handled correctly :

> [0x3cacc6c] main playlist debug: adding item `☺' ( ☺ )
>
>
Same binary, launched with mono :
>From commandline : ..\..\Mono-2.4.2.3\bin\mono Test-vs2008.exe
Strings seems to be handled correctly :

>  [0x201fdac] main playlist debug: adding item `a.avi' ( d:\a.avi )
>
> But still nothing happen (no feedback).

If I replace "dummy" interface with "qt" interface, nothing happens too.

Same behavior if compiled with VS2010 targeting 3.0.

Now, using this code :
--8<----8<----8<----8<----8<----8<----8<----8<--
                using (VLC instance = new VLC(vlcargs))
                {
                    Console.WriteLine("Loading Media : >{0}<", video);
                    Media media = new Media(instance, video);
                    media.MetaChanged += new
Media.MetaChange(media_MetaChanged);

                    Console.WriteLine("Media.Location : >{0}<",
media.Location);
                    Console.WriteLine("Creating Player from media...");
                    Player player = new Player(media);
                    Console.WriteLine("Playing...");
                    player.Play();

                    Console.WriteLine("Waiting for 'Enter' key press to
quit...");
                    System.Console.ReadLine();
                }
--8<----8<----8<----8<----8<----8<----8<----8<--
with method event handler :

--8<----8<----8<----8<----8<----8<----8<----8<--
        static void media_MetaChanged(Media media, MetaType type)
        {
            System.Console.WriteLine("Media : " + media.Location + "\tMeta :
" + type + "\tValue=" + media.GetMeta(type));
        }
--8<----8<----8<----8<----8<----8<----8<----8<--

Running from commandline, with Mono :
- Media is created, reading the Media.Location property returns the same
string
- When calling the Player.Play() method, I see in console :
--8<----8<----8<----8<----8<----8<----8<----8<--
Playing...
[0x21a8e84] main input debug: Creating an input for 'a.avi'
[0x21a8f24] main input debug: Creating an input for 'a.avi'
Media : d:\a.avi        Meta : NowPlaying       Value=
Stacktrace:

  at (wrapper managed-to-native) VideoLAN.LibVLC.LibVLC.PlayerPlay
(VideoLAN.LibVLC.PlayerHandle,VideoLAN.LibVLC.NativeException) <0x00004>
  at (wrapper managed-to-native) VideoLAN.LibVLC.LibVLC.PlayerPlay
(VideoLAN.LibVLC.PlayerHandle,VideoLAN.LibVLC.NativeException) <0xffffffff>
  at VideoLAN.LibVLC.Player.Play () <0x00023>
  at Damien.Program.Main (string[]) <0x003d1>
  at (wrapper runtime-invoke) Damien.Program.runtime_invoke_void_object
(object,intptr,intptr,intptr) <0xffffffff>

This application has requested the Runtime to terminate it in an unusual
way.
Please contact the application's support team for more information.
--8<----8<----8<----8<----8<----8<----8<----8<--

It seems that there is a native error occuring, that make mono crash.

Running my program directly from commandline (so it uses the Microsoft
Framework), behavior is the same (native crash) also with the bad string
behavior.


I hope there is enough details to help find a start of debugging/workaround
idea.

Thanks

Damien
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