为什么我得到“方法描述失败：401未经授权”

如何解决为什么我得到“方法描述失败：401未经授权”

让我解释一下我的问题，我正在尝试访问 DVR 系统中的不同频道。 我已经通过使用 opencv 成功访问了单个摄像头（通道 1）：

public_link = 'rtsp://test:test@192.168.1.48/cam/realmonitor'

cap = cv2.VideoCapture(public_link,cv2.CAP_FFMPEG)

问题是我无法使用这些参数访问其他频道：

public_link = 'rtsp://test:test@192.168.1.48/cam/realmonitor?channel=3&subtype=0'

cap = cv2.VideoCapture(public_link,cv2.CAP_FFMPEG)

我尝试了以下链接：

• rtsp://test:test@192.168.1.48/cam/realmonitor?channel=3&subtype=0
• rtsp://test:test@192.168.1.48/cam/realmonitor?channel=3&subtype=1
• rtsp://192.168.1.48/cam/realmonitor?channel=3&subtype=0&authbasic=dGVzdDp0ZXN0

我收到以下错误：

[rtsp @ 00000201ce582cc0] 方法描述失败：401 未经授权

我注意到，即使我使用这个 URL (rtsp://test:test@192.168.1.48/blablabla) 进行测试，它也能正常工作！ （仅限频道 #1）但是当我将符号 '=' 插入 URL 字符串时，出现上述错误。

这真的很令人沮丧，任何形式的帮助都将不胜感激。

PS：用户“test”在系统中具有管理员权限。

我尝试使用简单的 ffmpeg 命令运行测试，如下所示： ffmpeg -loglevel debug -i "rtsp://test:test@192.168.1.48/cam/monitor?channel=3&subtype=0" ./folder/output.m3u8

我收到以下错误：

PS C:\Users\cjhou> ffmpeg -loglevel debug -i "rtsp://test:test@192.168.1.48/cam/realmonitor?channel=3&subtype=0" .\folder\output.m3u8 
ffmpeg version 4.4-full_build-www.gyan.dev copyright (c) 2000-2021 the FFmpeg developers
built with gcc 10.2.0 (Rev6,Built by MSYS2 project)
configuration: --enable-gpl --enable-version3 --enable-static --disable-w32threads --disable-autodetect --enable-fontconfig --enable-iconv --enable-gnutls --enable-libxml2 --enable-gmp --enable-lzma --enable-libsnappy --enable-zlib --enable-librist --enable-libsrt --enable-libssh --enable-libzmq --enable-avisynth --enable-libbluray --enable-libcaca --enable-sdl2 --enable-libdav1d --enable-libzvbi --enable-librav1e --enable-libsvtav1 --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxvid --enable-libaom --enable-libopenjpeg --enable-libvpx --enable-libass --enable-frei0r --enable-libfreetype --enable-libfribidi --enable-libvidstab --enable-libvmaf --enable-libzimg --enable-amf --enable-cuda-llvm --enable-cuvid --enable-ffnvcodec --enable-nvdec --enable-nvenc --enable-d3d11va --enable-dxva2 --enable-libmfx --enable-libglslang --enable-vulkan --enable-opencl --enable-libcdio --enable-libgme --enable-libmodplug --enable-libopenmpt --enable-libopencore-amrwb --enable-libmp3lame --enable-libshine --enable-libtheora --enable-libtwolame --enable-libvo-amrwbenc --enable-libilbc --enable-libgsm --enable-libopencore-amrnb --enable-libopus --enable-libspeex --enable-libvorbis --enable-ladspa --enable-libbs2b --enable-libflite --enable-libmysofa --enable-librubberband --enable-libsoxr --enable-chromaprint
libavutil      56. 70.100 / 56. 70.100
libavcodec     58.134.100 / 58.134.100
libavformat    58. 76.100 / 58. 76.100
libavdevice    58. 13.100 / 58. 13.100
libavfilter     7.110.100 /  7.110.100
libswscale      5.  9.100 /  5.  9.100
libswresample   3.  9.100 /  3.  9.100
libpostproc    55.  9.100 / 55.  9.100
Splitting the commandline.
Reading option '-loglevel' ... matched as option 'loglevel' (set logging level) with argument 'debug'.
Reading option '-i' ... matched as input url with argument 'rtsp://test:test@192.168.1.48/cam/realmonitor?channel=3&subtype=0'.
Reading option '.\folder\output.m3u8' ... matched as output url. 
Finished splitting the commandline. 
Parsing a group of options: global. 
Applying option loglevel (set logging level) with argument debug. 
Successfully parsed a group of options. 
Parsing a group of options: input url rtsp://test:test@192.168.1.48/cam/realmonitor?channel=3&subtype=0.
Successfully parsed a group of options.
opening an input file: rtsp://houssem:152400@192.168.1.48/cam/realmonitor?channel=3&subtype=0.
[tcp @ 000001882b592240] No default whitelist set 
[tcp @ 000001882b592240] Original list of addresses: 
[tcp @ 000001882b592240] Address 192.168.1.48 port 554 
[tcp @ 000001882b592240] Interleaved list of addresses: 
[tcp @ 000001882b592240] Address 192.168.1.48 port 554 [tcp @ 000001882b592240] Starting connection attempt to 192.168.1.48 port 554  
[tcp @ 000001882b592240] Successfully connected to 192.168.1.48 port 554 
[rtsp @ 000001882b58f080] method DESCRIBE Failed: 401 Unauthorized 
[rtsp @ 000001882b58f080] Cseq: 3  Server: Rtsp Server 960*576*30*4096

WWW-Authenticate: Digest realm="Surveillance Server",nonce="44976150"

rtsp://test:test@192.168.1.48/cam/realmonitor?channel=3&subtype=0: Server returned 401 Unauthorized (authorization Failed)

使用此命令 ffplay "rtsp://test:test@192.168.1.48/cam/realmonitor?channel=3&subtype=0"，我得到以下输出：

PS C:\Users\cjhou> ffplay "rtsp://test:test@192.168.1.48/cam/realmonitor?channel=3&subtype=0"
ffplay version 4.4-full_build-www.gyan.dev copyright (c) 2003-2021 the FFmpeg developers
  built with gcc 10.2.0 (Rev6,Built by MSYS2 project)
  configuration: --enable-gpl --enable-version3 --enable-static --disable-w32threads --disable-autodetect --enable-fontconfig --enable-iconv --enable-gnutls --enable-libxml2 --enable-gmp --enable-lzma --enable-libsnappy --enable-zlib --enable-librist --enable-libsrt --enable-libssh --enable-libzmq --enable-avisynth --enable-libbluray --enable-libcaca --enable-sdl2 --enable-libdav1d --enable-libzvbi --enable-librav1e --enable-libsvtav1 --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxvid --enable-libaom --enable-libopenjpeg --enable-libvpx --enable-libass --enable-frei0r --enable-libfreetype --enable-libfribidi --enable-libvidstab --enable-libvmaf --enable-libzimg --enable-amf --enable-cuda-llvm --enable-cuvid --enable-ffnvcodec --enable-nvdec --enable-nvenc --enable-d3d11va --enable-dxva2 --enable-libmfx --enable-libglslang --enable-vulkan --enable-opencl --enable-libcdio --enable-libgme --enable-libmodplug --enable-libopenmpt --enable-libopencore-amrwb --enable-libmp3lame --enable-libshine --enable-libtheora --enable-libtwolame --enable-libvo-amrwbenc --enable-libilbc --enable-libgsm --enable-libopencore-amrnb --enable-libopus --enable-libspeex --enable-libvorbis --enable-ladspa --enable-libbs2b --enable-libflite --enable-libmysofa --enable-librubberband --enable-libsoxr --enable-chromaprint
  libavutil      56. 70.100 / 56. 70.100
  libavcodec     58.134.100 / 58.134.100
  libavformat    58. 76.100 / 58. 76.100
  libavdevice    58. 13.100 / 58. 13.100
  libavfilter     7.110.100 /  7.110.100
  libswscale      5.  9.100 /  5.  9.100
  libswresample   3.  9.100 /  3.  9.100
  libpostproc    55.  9.100 / 55.  9.100
[rtsp @ 000001d413d2f640] method DESCRIBE Failed: 401 Unauthorized
rtsp://test:test@192.168.1.48/cam/realmonitor?channel=3&subtype=0: Server returned 401 Unauthorized (authorization Failed)
    nan    :  0.000 fd=   0 aq=    0KB vq=    0KB sq=    0B f=0/0

顺便说一下，我正在使用这个设备：

• 设备名称：数字录像
• 型号：16-CHANNEL
• 软件版本：XVR_HI3521A_16_v6.1.52.1
• 日期：2016 年 12 月 19 日 14:36:39

希望这会有所帮助！

解决方法

好吧，经过对我使用的 DVR 模型的大量研究。事实证明，我使用的是 Longse DVR 类型的模型。我真的不知道具体是什么型号，但至少我知道它是 Longse DVR。

事实证明我使用了错误的网址。 DVR/摄像头 URL 应采用以下格式：

rtsp://[username]:[password]@[IP_ADDRESS]:[PORT]/[channelID][SubTypeID]

最后，我可以访问连接到 DVR 的所有摄像机，例如（在子集 0 上观看频道 #3）：

rtsp://test:test@192.168.1.48:554/30

或在子集 1) 上观看频道 #6

rtsp://test:test@192.168.1.48:554/61

“ISpyConnect 代理”软件为我提供了巨大的帮助，可以提取给定模型的所有可用 URL。 （我已输入型号：Longse：未上市）