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• Restore the previous system path variable (windows)

  17 septembre 2022, par NaRas

  a question regarding messing with Windows Path variable.
My situation is quite specific :

  


  

  • I was trying to install ffmpeg according to this tutorial https://www.geeksforgeeks.org/how-to-install-ffmpeg-on-windows/

  


  • The last step was setting the path variable setx /m PATH "C:\ffmpeg\bin;%PATH%"

  


  • It worked, however afterwards I noticed that if I try to call python from the command prompt or the powershell if run as administrator, I started getting 'chcp' is not recognized as an internal or external command, (although works fine if run as user), indicating that something is wrong with PATH variables.

  


  • I looked into my variables and saw this edit.

  


  


  Path

  


  It seems to me that the command added the ffmpeg line to the system path and possibly overwritten the original, which is why there are issues when using command prompt as administrator. It probably should have added it to the user Path (not system Path variable)

  


  If that is the case, is there a way to restore the previous system Path variable. Maybe I can paste it from the user Path variable ?

  


• Using DirectX from subprocess executed by windows service

  26 mai 2019, par Igor Gorelik

  I need to execute ffmpeg process from windows service and capture it’s standard output. It works fine until I use hardware acceleration. Because accessing DirectX from windows service is restricted, the subprocess also fails to access it.

  When I’m executing the same code from console application, everything works OK, but the same code executed from windows service fails to use hardware acceleration.

          string ffmpegArgs = /*-hwaccel dxva2 */"-threads 0 -probesize 100512 -i c:/Temp/test.mp4 -vf yadif -vcodec libx264 -preset ultrafast -tune zerolatency -profile baseline -x264-params keyint=20:min-keyint=20:scenecut=-1 -acodec aac -b:a 48k -flags +cgop -f mp4 -movflags empty_moov+default_base_moof+frag_keyframe c:/temp/output.avi";
  
  
  
          var psi = new ProcessStartInfo
  
          {
  
              FileName = "c:/Temp/ffmpeg4/ffmpeg.exe",
  
              Arguments = ffmpegArgs,
  
              WorkingDirectory = "c:/Temp/ffmpeg4",
  
              CreateNoWindow = false,
  
              WindowStyle = ProcessWindowStyle.Hidden,
  
              RedirectStandardInput = false,
  
              RedirectStandardOutput = true,
  
              RedirectStandardError = true,
  
              UseShellExecute = false
  
          };
  
  
  
          var processVideo = new Process { StartInfo = psi }.Start();

  I need somehow break the inherited restrictions to be able to execute ffmpeg with hardware acceleration (access DirectX API). Any suggestions ?

• linphone on windows building error

  21 novembre 2013, par chhameed

  i have downloaded the linphone for Android from Github.
  i have also followed all the instructions in readme file. the problem is that when i run ndk-build command it produce below error .

  Android NDK: ERROR:jni/..//submodules/externals/build/ffmpeg/Android.mk:avutil-linphone: LOCAL_SRC_FILES points to a missing file
  
  Android NDK: Check that jni/..//submodules/externals/build/ffmpeg/arm/libavutil/libavutil-linphone-arm.so exists  or that its path is correct
  
  /cygdrive/c/development/android-ndk-r9b/build/core/prebuilt-library.mk:45: *** Android NDK: Aborting    .  Stop.

  what this error mean ? & how can i resolve this? i already spent many hours to searchout this error but no success...
  my OS is window 7 & i used cygwin for commands.

  i have found same question on SO
  Android NDK error when using FFmpeg in Android ?

  it says Basically problem was with ffmpeg lib.I was not able to compile ffmpeg lib on Windows 7. I switched to Ubuntu & tried AppUnite & after spending so many hours it was working.

  is it not possible to build linphone on windows ???