Hello. I'm a first-time poster and relatively new to WinRT programming. My goal (for now) is to implement a simple video player built on FFmpeg (rather than Windows Media Foundation, for WTV / MPEG-2 / etc. support) as a Windows 8 app. I understand that
this probably won't pass App Store certification, but I'd like to try it anyway.
I've managed to compile, link and run sample code which uses FFmpeg with Visual C++ 2012 as a 'console application' with no special support from the Win32 API. I'm currently attempting to bring this sample code into a Direct2D (XAML) template application.
Here's what I've done:
- created a new Direct2D (XAML) project in MSVS 2012, named 'ffmpeg-metro'
- downloaded the most recent 32-bit build of FFmpeg shared DLLs, import libraries and header files
- added the include path, the import library (.lib) path, and all dependencies to the project configuration
- included each 32-bit DLL within the project, setting each 'Content' property to 'true' to ensure they're copied into the app correctly
- added the following code to App.xaml.cpp:
extern "C" {
#include <libavformat/avformat.h> }
/* ... */
App::App() {
InitializeComponent();
Suspending += ref new SuspendingEventHandler(this, &App::OnSuspending);
av_register_all(); /* initialize FFmpeg codecs - symbol comes from avcodec-54.dll */
}
The project builds correctly, but at runtime when debugging, the application fails to activate. Here's the debug output provided by MSVS 2012:
'ffmpeg-metro.exe' (Win32): Loaded 'C:\Users\lucas\code\ffmpeg-metro\x64\Debug\ffmpeg-metro\AppX\ffmpeg-metro.exe'. Symbols loaded.
'ffmpeg-metro.exe' (Win32): Loaded 'C:\Windows\System32\ntdll.dll'. Symbols loaded.
'ffmpeg-metro.exe' (Win32): Loaded 'C:\Windows\System32\kernel32.dll'. Symbols loaded.
'ffmpeg-metro.exe' (Win32): Loaded 'C:\Windows\System32\KernelBase.dll'. Symbols loaded.
'ffmpeg-metro.exe' (Win32): Loaded 'C:\Windows\System32\d2d1.dll'. Symbols loaded.
'ffmpeg-metro.exe' (Win32): Loaded 'C:\Windows\System32\d3d11.dll'. Symbols loaded.
'ffmpeg-metro.exe' (Win32): Loaded 'C:\Windows\System32\dxgi.dll'. Symbols loaded.
'ffmpeg-metro.exe' (Win32): Loaded 'C:\Windows\System32\ole32.dll'. Symbols loaded.
'ffmpeg-metro.exe' (Win32): Loaded 'C:\Windows\System32\DWrite.dll'. Symbols loaded.
'ffmpeg-metro.exe' (Win32): Loaded 'C:\Users\lucas\code\ffmpeg-metro\x64\Debug\ffmpeg-metro\AppX\avformat-54.dll'. Module was built without symbols.
'ffmpeg-metro.exe' (Win32): Loaded 'C:\Program Files\WindowsApps\Microsoft.VCLibs.110.00.Debug_11.0.50727.1_x64__8wekyb3d8bbwe\vccorlib110d.dll'. Symbols loaded.
'ffmpeg-metro.exe' (Win32): Loaded 'C:\Program Files\WindowsApps\Microsoft.VCLibs.110.00.Debug_11.0.50727.1_x64__8wekyb3d8bbwe\msvcp110d.dll'. Symbols loaded.
'ffmpeg-metro.exe' (Win32): Loaded 'C:\Program Files\WindowsApps\Microsoft.VCLibs.110.00.Debug_11.0.50727.1_x64__8wekyb3d8bbwe\msvcr110d.dll'. Symbols loaded.
'ffmpeg-metro.exe' (Win32): Loaded 'C:\Windows\System32\combase.dll'. Symbols loaded.
'ffmpeg-metro.exe' (Win32): Loaded 'C:\Windows\System32\msvcrt.dll'. Symbols loaded.
'ffmpeg-metro.exe' (Win32): Loaded 'C:\Windows\System32\user32.dll'. Symbols loaded.
'ffmpeg-metro.exe' (Win32): Loaded 'C:\Windows\System32\gdi32.dll'. Symbols loaded.
'ffmpeg-metro.exe' (Win32): Loaded 'C:\Windows\System32\rpcrt4.dll'. Symbols loaded.
'ffmpeg-metro.exe' (Win32): Loaded 'C:\Windows\System32\sechost.dll'. Symbols loaded.
'ffmpeg-metro.exe' (Win32): Loaded 'C:\Windows\System32\advapi32.dll'. Symbols loaded.
'ffmpeg-metro.exe' (Win32): Loaded 'C:\Windows\System32\avifil32.dll'. Symbols loaded.
'ffmpeg-metro.exe' (Win32): Loaded 'C:\Windows\System32\winmm.dll'. Symbols loaded.
'ffmpeg-metro.exe' (Win32): Loaded 'C:\Windows\System32\ws2_32.dll'. Symbols loaded.
'ffmpeg-metro.exe' (Win32): Loaded 'C:\Users\lucas\code\ffmpeg-metro\x64\Debug\ffmpeg-metro\AppX\avcodec-54.dll'. Module was built without symbols.
'ffmpeg-metro.exe' (Win32): Loaded 'C:\Users\lucas\code\ffmpeg-metro\x64\Debug\ffmpeg-metro\AppX\avutil-52.dll'. Module was built without symbols.
'ffmpeg-metro.exe' (Win32): Loaded 'C:\Windows\System32\oleaut32.dll'. Symbols loaded.
'ffmpeg-metro.exe' (Win32): Loaded 'C:\Windows\System32\msacm32.dll'. Symbols loaded.
'ffmpeg-metro.exe' (Win32): Loaded 'C:\Windows\System32\msvfw32.dll'. Symbols loaded.
'ffmpeg-metro.exe' (Win32): Loaded 'C:\Windows\System32\winmmbase.dll'. Symbols loaded.
'ffmpeg-metro.exe' (Win32): Loaded 'C:\Windows\System32\nsi.dll'. Symbols loaded.
'ffmpeg-metro.exe' (Win32): Loaded 'C:\Windows\System32\shell32.dll'. Symbols loaded.
'ffmpeg-metro.exe' (Win32): Loaded 'C:\Windows\System32\comctl32.dll'. Symbols loaded.
'ffmpeg-metro.exe' (Win32): Loaded 'C:\Windows\System32\shlwapi.dll'. Symbols loaded.
'ffmpeg-metro.exe' (Win32): Loaded 'C:\Windows\System32\imm32.dll'. Symbols loaded.
'ffmpeg-metro.exe' (Win32): Loaded 'C:\Windows\System32\msctf.dll'. Symbols loaded.
The thread 0x1a80 has exited with code -1073741502 (0xc0000142).
The program '[9252] ffmpeg-metro.exe' has exited with code -1073741502 (0xc0000142) 'DLL Initialization Failed'.
The DLLs are being copied in an accessible location, and Dependency Walker shows that they do not require any unusual dependencies: advapi32.dll, kernel32.dll, msvcrt.dll, user32.dll and avutil-52.dll, which is also correctly copied into the app directory
and depends on the same system libraries. (I'd post a screenshot but my account isn't verified yet.)
Furthermore, replacing the call to av_register_all() with the following code shows no errors in loading the DLL, and the application behaves normally:
HINSTANCE hnd = LoadPackagedLibrary(L"avcodec-54.dll", 0);
OutputDebugStringW(GetLastError().ToString()->Data()); /* outputs "0" */
I'm probably missing something important. Can anyone help me out?
'DLL Initialization Failed' when loading FFmpeg DLLs in Win8 app
