Winform VlcControl在Windows7播放摄像头流黑屏问题求助

问题描述 #

使用Vlc.DotNet.Forms播放摄像头RTSP流，在Windows10上正常运行，但复制到Windows7 x64设备后，仅能听到音频，视频无法显示。但该流在VLC Player中可正常播放。

环境信息 #

• 操作系统：Windows7 x64
• Vlc.DotNet.Forms版本：3.1.0
• LibVLC版本：3.0.20
• .NET Framework版本：4.5.2
• 项目构建架构：x64

代码实现 #

VlcControl初始化代码 #

this.vlcControl = new VlcControl();
this.vlcControl.Dock = DockStyle.Fill;
this.vlcControl.BackColor = System.Drawing.Color.Black;
this.vlcControl.BeginInit();
var currentDirectory = Directory.GetCurrentDirectory();
this.vlcControl.VlcLibDirectory = new DirectoryInfo(currentDirectory + "\\libvlc\\win-x64\\");
this.vlcControl.VlcMediaplayerOptions = new[] {
    "-vv",
#if DEBUG
    "-I",
    "dummy",
    "--ignore-config",
    "--extraintf=logger",
    "--verbose=2",
    "--file-logging",
    "--logfile=vlc-log.txt"
#endif
    };
this.vlcControl.EndInit();

播放流代码 #

var playUrl = await QueryPlayUrl(cameraIndexCode);
var options = new string[]
{
    ":vout=direct3d11",
};
this.vlcControl.Play(playUrl, options);

VLC日志输出 #

-- logger module started --
main debug: VLC media player - 3.0.20 Vetinari
main debug: Copyright © 1996-2023 the VideoLAN team
main debug: revision 3.0.20-0-g6f0d0ab126
main debug: configured with /builds/videolan/vlc/extras/package/win32/../../../configure  '--enable-update-check' '--enable-lua' '--enable-faad' '--enable-flac' '--enable-theora' '--enable-avcodec' '--enable-merge-ffmpeg' '--enable-dca' '--enable-mpc' '--enable-libass' '--enable-schroedinger' '--enable-realrtsp' '--enable-live555' '--enable-shout' '--enable-goom' '--enable-sse' '--enable-mmx' '--enable-libcddb' '--enable-zvbi' '--disable-telx' '--enable-nls' '--host=x86_64-w64-mingw32' '--with-contrib=../contrib/x86_64-w64-mingw32' '--with-breakpad=https://win.crashes.videolan.org' '--enable-qt' '--enable-skins2' '--enable-dvdread' '--enable-caca' 'host_alias=x86_64-w64-mingw32' 'CFLAGS= -D_WIN32_WINNT=0x0502 -DWINVER=0x502 -D__MSVCRT_VERSION__=0x700 ' 'CXXFLAGS= -D_WIN32_WINNT=0x0502 -DWINVER=0x502 -D__MSVCRT_VERSION__=0x700 ' 'PKG_CONFIG=pkg-config' 'PKG_CONFIG_LIBDIR=/usr/x86_64-w64-mingw32/lib/pkgconfig:/usr/lib/x86_64-w64-mingw32/pkgconfig'
main debug: using multimedia timers as clock source
main debug:  min period: 1 ms, max period: 1000000 ms
main debug: searching plug-in modules
main debug: loading plugins cache file C:\Users\Administrator\Desktop\IM_Camera\Debug\libvlc\win-x64\plugins\plugins.dat
main debug: recursively browsing `C:\Users\Administrator\Desktop\IM_Camera\Debug\libvlc\win-x64\plugins'   main debug: plug-ins loaded: 497 modules   main debug: looking for logger module matching "any": 2 candidates   file debug: opening logfile `vlc-log.txt'
main debug: using logger module "file"
main debug: translation test: code is "C"
main debug: looking for keystore module matching "memory": 3 candidates
main debug: using keystore module "memory"
main debug: CPU has capabilities MMX MMXEXT SSE SSE2 SSE3 SSSE3 SSE4.1 SSE4.2 FPU
main debug: creating audio output
main debug: looking for audio output module matching "any": 6 candidates
mmdevice debug: using default device
mmdevice debug: display name changed: VLC media player (LibVLC 3.0.20)
mmdevice debug: version 2 session control unavailable
mmdevice debug: volume from -192.000000 dB to +0.000000 dB with 1.500000 dB increments
main debug: using audio output module "mmdevice"
main debug: keeping audio output
main debug: looking for interface module matching "logger,none": 16 candidates
logger error: The logger interface no longer exists.
logger: As of VLC version 0.9.0, use --file-logging to write logs to a file.
main debug: no interface modules matched
main error: no suitable interface module
main error: interface "logger,none" initialization failed
main debug: creating audio output
main debug: looking for audio output module matching "any": 6 candidates
mmdevice debug: using default device
mmdevice debug: version 2 session control unavailable
mmdevice debug: volume from -192.000000 dB to +0.000000 dB with 1.500000 dB increments
main debug: using audio output module "mmdevice"
main debug: keeping audio output
main debug: Creating an input for 'rtsp://xx.xx.xx.xx:554/openUrl/PWvKA5W'
main debug: using timeshift granularity of 50 MiB
main debug: using timeshift path: C:\Users\ADMINI~1\AppData\Local\Temp
main debug: `rtsp://xx.xx.xx.xx:554/openUrl/PWvKA5W' gives access `rtsp' demux `any' path `xx.xx.xx.xx:554/openUrl/PWvKA5W'
main debug: creating demux: access='rtsp' demux='any'  location='xx.xx.xx.xx:554/openUrl/PWvKA5W'  file='\xx.xx.xx.xx:554\openUrl\PWvKA5W'
main debug: looking for access_demux module matching "rtsp": 15 candidates
live555 debug: version 2016.11.28
live555 debug: RTP subsession 'video/H264'
main debug: selecting program id=0
live555 debug: setup start: 0.000000 stop:0.000000
live555 debug: We have a timeout of 8 seconds
live555 debug: play start: 0.000000 stop:0.000000
main debug: using access_demux module "live555"
main debug: looking for packetizer module matching "any": 25 candidates
main debug: using packetizer module "h264"
main debug: looking for video decoder module matching "any": 20 candidates
avcodec debug: using ffmpeg Lavc58.134.100
avcodec debug: CPU flags: 0x000fd3db
avcodec debug: allowing 6 thread(s) for decoding
avcodec debug: codec (h264) started
avcodec debug: using frame thread mode with 6 threads
main debug: using video decoder module "avcodec"
main debug: looking for meta reader module matching "any": 2 candidates
lua debug: Trying Lua scripts in  C:\Users\Administrator\AppData\Roaming\vlc\lua\meta\reader
lua debug: Trying Lua scripts in C:\Users\Administrator\Desktop\IM_Camera\Debug\libvlc\win-x64\lua\meta\reader
main debug: no meta reader modules matched
main debug: `rtsp://xx.xx.xx.xx:554/openUrl/PWvKA5W' successfully opened   main debug: Buffering 0%   main debug: Buffering 1%   main debug: Buffering 4%   main debug: Buffering 8%   h264 warning: waiting for SPS/PPS   h264 warning: waiting for SPS/PPS   main debug: Buffering 12%   h264 warning: waiting for SPS/PPS   h264 debug: found NAL_SPS (sps_id=0)   main debug: Buffering 82%   h264 debug: found NAL_PPS (pps_id=0 sps_id=0)   main debug: Stream buffering done (1109 ms in 760 ms)   main error: buffer deadlock prevented   main debug: Decoder wait done in 0 ms   main debug: killing decoder fourcc `h264'
main debug: removing module "avcodec"
main debug: removing module "h264"
main debug: removing module "live555"
main debug: Program doesn't contain anymore ES
main debug: removing module "mmdevice"
main debug: exiting
main debug: no exit handler
main debug: removing all interfaces
main debug: destroying
main debug: deactivating the playlist
main debug: removing module "mmdevice"
main debug: deleting item `Playlist'
main debug: removing module "memory"
-- logger module stopped --

解决方案 #

1. 更换视频输出模块 #

你指定的:vout=direct3d11在Windows7环境兼容性较差，部分老显卡或系统配置无法正常驱动。尝试更换为以下兼容选项：

• 使用direct3d9（平衡兼容性与性能）：

var options = new string[]
{
    ":vout=direct3d9",
};

• 使用gdi（兼容性最强，性能稍低）：

var options = new string[]
{
    ":vout=gdi",
};

• 使用d3d11va（硬件加速，需显卡支持Direct3D11）：

var options = new string[]
{
    ":vout=d3d11va",
};

2. 修复接口初始化错误 #

日志显示main error: no suitable interface module，是因为你使用了废弃的--extraintf=logger参数，移除该参数即可：

this.vlcControl.VlcMediaplayerOptions = new[] {
    "-vv",
#if DEBUG
    "-I",
    "dummy",
    "--ignore-config",
    "--verbose=2",
    "--file-logging",
    "--logfile=vlc-log.txt"
#endif
    };

3. 检查LibVLC依赖与插件 #

• 确保Windows7设备已安装Visual C++ Redistributable for Visual Studio 2015-2019 x64，LibVLC 3.x版本依赖该运行库。
• 确认LibVLC的plugins目录完整复制到目标设备，尤其是video_output子目录下的libdirect3d9_plugin.dll、libgdi_plugin.dll等视频输出插件未缺失。

4. 调整缓冲参数 #

日志中出现main error: buffer deadlock prevented，可增加网络缓冲时间避免死锁：

var options = new string[]
{
    ":vout=direct3d9",
    ":network-caching=2000",
    ":rtsp-caching=2000"
};

内容的提问来源于stack exchange，提问作者Marvin Wilson