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• Installing OpenCV 3.1.0 with CMake on Windows 7, opencv_ffmpeg.dll invalid hash

  21 novembre 2016, par Troppsi

  I’m trying to install OpenCV 3.1.0 with MSVC2015 compiler using CMake. I get an error saying that the file hash is different from the expected hash. I have no access to internet on the PC this needs to be installed on. I tired to install it successfully on a PC with internet to see if I could copy those files to the PC without internet. But that didn’t work as CMake deletes the files, and tries to do it it’s own way. I also tried this solution, but it didn’t work.

  Here is the error message :

  CMake Warning at cmake/OpenCVUtils.cmake:872 (message):
  
    Download: Local copy of opencv_ffmpeg.dll has invalid MD5 hash:
  
    d41d8cd98f00b204e9800998ecf8427e (expected:
  
    89c783eee1c47bfc733f08334ec2e31c)
  
  Call Stack (most recent call first):
  
    3rdparty/ffmpeg/ffmpeg.cmake:10 (ocv_download)
  
    cmake/OpenCVFindLibsVideo.cmake:206 (include)
  
    CMakeLists.txt:536 (include)
  
  
  
  Downloading opencv_ffmpeg.dll...
  
  CMake Error at cmake/OpenCVUtils.cmake:895 (file):
  
    file DOWNLOAD HASH mismatch
  
  
  
      for file: [C:/OpenCV/opencv/sources/3rdparty/ffmpeg/downloads/89c783eee1c47bfc733f08334ec2e31c/opencv_ffmpeg.dll]
  
        expected hash: [89c783eee1c47bfc733f08334ec2e31c]
  
          actual hash: [d41d8cd98f00b204e9800998ecf8427e]
  
               status: [6;"Couldn't resolve host name"]
  
  
  
  Call Stack (most recent call first):
  
    3rdparty/ffmpeg/ffmpeg.cmake:10 (ocv_download)
  
    cmake/OpenCVFindLibsVideo.cmake:206 (include)
  
    CMakeLists.txt:536 (include)
  
  
  
  
  
  CMake Error at cmake/OpenCVUtils.cmake:899 (message):
  
    Failed to download opencv_ffmpeg.dll.  Status=6;"Couldn't resolve host
  
    name"
  
  Call Stack (most recent call first):
  
    3rdparty/ffmpeg/ffmpeg.cmake:10 (ocv_download)
  
    cmake/OpenCVFindLibsVideo.cmake:206 (include)
  
    CMakeLists.txt:536 (include)

  I would like to be able to install this without internet, but it proves very diffucult. Does anyone have any solutions to this ?

  Thanks in advance.

• How to use google/zx to execute ffmpeg shell in windows ?

  26 août 2021, par radiorz

  I download the ffmpeg through scoop,
and I can
My script is below :

  


  #!/usr/bin/env zx
const filePath = `./abc.mp4`;
const srsServerURL = `192.168.30.100`;
await $`ffmpeg -re -i ${filePath} -c copy -f mp4 -y rtmp://${srsServerURL}/live/livestream`;


  


  but the zx tell me that ffmpeg not found.

  


• FFmpeg : Build ffplay on Windows with Visual Studio and MSYS2

  13 septembre 2023, par San Zhang

  I have built FFmpeg on Windows with Visual Studio and MSYS2.

  


  My problem is, ffplay.exe is not built. Some search online suggests the reason might be of missing dependencies(most likely sdl2). I then installed sdl2 with MSYS2, and realized that the only sdl2 package available was built with MinGW. I imagine this means Visual Studio won't be able to use it to build ffplay.exe.

  


  My question : I can download sdl2 that's built with VC++, but how do I incorporate that into the FFmpeg build ? Do I simply put SDL2.dll under [MSYS2_Folder]\mingw64\bin ?

  


  Any thought/idea ?