VLC 编码和显示

问题描述

在捕获 libvlc 索引文件公开的 ts 片段后，我使用 m3u8 显示视频流。我以前从未使用过 libvlc。根据一些教程，以下几行：

    libvlc_instance_t* inst;
    libvlc_media_player_t* mp;
    libvlc_media_t* m;
    
    inst=libvlc_new(0,NULL);
    m=libvlc_media_new_path(inst,"...");
    mp=libvlc_media_player_new_from_media(m);
    
    libvlc_media_release(m);
    
    //For windows. binding the displaying window.
    libvlc_media_player_set_hwnd(mp,hwnd);
    
    libvlc_media_player_play(mp);
    Sleep(3000);
    
    libvlc_media_player_stop(mp);
    libvlc_media_player_release(mp);
    libvlc_release(inst);

看起来你只需要调用几个函数并设置一些参数进行一些初始化然后绑定窗口来显示视频资源，libvlc应该知道如何进行编码和解码工作并显示流。完成所有这些工作后，释放资源。听起来很方便。

按照这些代码后，窗口只闪烁了一次就退出了。我还不知道为什么。

我的代码是这样的：

int test(HWND hwnd)
{
    //const char* version=libvlc_get_version();
    //const char* compiler=libvlc_get_compiler();
    //const char* changeset=libvlc_get_changeset();
    
    //printf("Libvlc.\n");
    //printf("Version:%s\n",version);
    //printf("Compiler:%s\n",compiler);
    //printf("Changeset:%s\n",changeset);
    
    libvlc_instance_t* inst;
    libvlc_media_player_t* mp;
    libvlc_media_t* m;
    
    inst=libvlc_new(0,"my video resource file path...");
    mp=libvlc_media_player_new_from_media(m);
    
    libvlc_media_release(m);
    
    //For windows. binding the displaying window.
    libvlc_media_player_set_hwnd(mp,hwnd);
    
    libvlc_media_player_play(mp);
    Sleep(3000);
    
    libvlc_media_player_stop(mp);
    libvlc_media_player_release(mp);
    libvlc_release(inst);
    
    return 0;
}

int WINAPI WinMain(HINSTANCE hinstance,HINSTANCE hprevinstance,PSTR szcmdLine,int icmdshow)
{
    HWND hwnd=NULL;
    
    InitCommonControls();
    Gdiplusstartup(&gdiplusToken,&gdiplusstartupInput,NULL);
    
    if(Frame_Register(hinstance)!=0) {
        MessageBox(NULL,"window register Failed","Sorry",MB_OK|MB_ICONERROR);
        return 0;
    }
    if(NULL==(hwnd=Frame_Create(hinstance,1200,600))) return 0;
    
    Frame_Test(hwnd);
    
    return Frame_Run(hwnd);
}

int regist_window(char* class_name,HINSTANCE instance,WNDPROC proc)
{
    WNDCLASSEX wndclass;

    wndclass.cbSize=sizeof(wndclass);
    wndclass.style = CS_DBLCLKS|CS_HREDRAW|CS_VREDRAW;
    wndclass.lpfnWndProc = proc;
    wndclass.cbClsExtra = 0;
    wndclass.cbWndExtra = 0;
    wndclass.hInstance = instance;
    wndclass.hIcon = NULL;
    wndclass.hCursor = LoadCursor(NULL,IDC_ARROW);
    wndclass.hbrBackground = (HBrush)CreateSolidBrush(RGB(0,0));
    wndclass.lpszMenuName = NULL;
    wndclass.lpszClassName = class_name;
    wndclass.hIconSm = NULL;

    if(!RegisterClassEx(&wndclass)) return -1;
    return 0;
}

HWND Frame_Create(HINSTANCE instance,int width,int height)
{
    int cx,cy;
    POINT pt;
    
    cx=GetSystemMetrics(SM_CXSCREEN);
    cy=GetSystemMetrics(SM_CYSCREEN);
    
    pt.x=(cx-width)>>1;
    pt.y=(cy-height)>>1;
    
    HWND hwnd=CreateWindowEx(NULL,WINDOW_CLASS_NAME,"Docker Frame Capture",WS_OVERLAPPEDWINDOW|WS_VISIBLE|WS_HSCROLL|WS_CLIPCHILDREN,pt.x,pt.y,width,height,NULL,(HMENU)NULL,instance,NULL);

    // Some owner-drawing and data refferring to the customized window.
    Frame_InitialSettings(hwnd);
    
    return hwnd;
}

int Frame_Run(HWND frame)
{
    MSG msg;

    while(GetMessage(&msg,0)) {
        if(!IsDialogMessage(frame,&msg)) {
            TranslateMessage(&msg);
            dispatchMessage(&msg);
        }
    }
    
    GdiplusShutdown(gdiplusToken);
    
    return(msg.wParam);
}

int Frame_Test(HWND hwnd)
{
    //create a child window,as a container for vlc player.
    RECT rc;
    GetClientRect(hwnd,&rc);
    int width=rc.right-rc.left,height=rc.bottom-rc.top;
    
    HWND vlc_hwnd=CreateWindowEx(NULL,WC_STATIC,"",WS_CHILD|WS_VISIBLE,hwnd,//LoadMenu(instance,"IDR_FRMENU"),(HINSTANCE)getwindowlongPtr(hwnd,GWLP_HINSTANCE),NULL);
    
    test(vlc_hwnd);
    return 0;
}

新增内容： 函数 libvlc_new 返回 null，libvlc_errmsg() 返回 null 字符串。

7 月 7 日修改： 问题解决了，您必须将libvlc的plugsin文件夹复制到您的项目中。

解决方法

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