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• How to compile ffmpeg for Qt use on Windows ?

  13 avril 2016, par Himiko

  I want to use ffmpeg libs for programming in Qt.

  • How can I compile ffmpeg into *.lib files on Windows ?

  or

  • How can I use the compiled *.dll files which are released officially in Qt ?

  Also, which way is better ?

• Why cant I feed FFServer(Linux) from FFMpeg (Windows) ?

  14 mars 2018, par Milen

  What I want to do is to stream a (only)video file from Windows 10 using RTSP. First, I tried to use webm HTTP instead. I found that ffserver is not avaiable for Windows, so I configured and run ffserver on a Linux machine (Ubuntu 16.04). Then, I downloaded pre-built ffmpeg for Windows x64 and run a ffmpeg command to feed my rtsp server. The fact is that the command didnt work on my Windows machine

  The same ffmpeg command works well if I run it in my Linux machine.

  The details are descripted below :

  ffserver.conf file :

  HTTPPort 8090                     
  
  HTTPBindAddress 0.0.0.0
  
  MaxHTTPConnections 2000
  
  MaxClients 1000
  
  MaxBandwidth 10000             
  
  
  
  CustomLog -
  
  NoDaemon                      
  
  
  
  <feed>               
  
     File ./feed1.ffm        
  
     FileMaxSize 1G           
  
     ACL allow 127.0.0.1 192.168.0.131 #Windows machine IP address
  
  </feed>
  
  
  
  <stream>        
  
     Feed feed1.ffm  
  
     Format webm
  
  
  
     # Video settings
  
     VideoCodec libvpx
  
     VideoSize 720x576    
  
     VideoFrameRate 25  
  
     AVOptionVideo flags +global_header 
  
  
  
     AVOptionVideo cpu-used 0
  
     AVOptionVideo qmin 10
  
     AVOptionVideo qmax 42
  
     AVOptionVideo quality good
  
     NoAudio
  
  
  
     PreRoll 15
  
     StartSendOnKey
  
     VideoBitRate 400         
  
  </stream>
  
  
  
  <stream> 
  
     Format status
  
  
  
     ACL allow localhost
  
     ACL allow 192.168.0.0 192.168.255.255
  
     ACL allow 192.168.0.131 # my windows machine ip
  
  </stream>
  
  
  
  <redirect> 
  
     URL http://www.ffmpeg.org/
  
  </redirect>

  ffmpeg command to feed server :

  ffmpeg -i video.avi http://192.168.0.119:8090/feed1.ffm

  Error thrown by Windows command line :

   Unable to find a suitable output format for 'http://192.168.0.119:8090/feed1.ffm' .
  
   http://192.168.0.119:8090/feed1.ffm : Invalid argument.

  Someone told me that Windows newest version of FFMpeg doesnt support ffm, Is that true ? I couldnt find a different format example.

• 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.