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• 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 ?

• ffmpeg was not found on your system in Azure service fabric application

  17 novembre 2023, par dotnet developer

  I have a stateless service fabric application, which uses ffmpeg.exe to convert video files. ffmpeg.exe is added to the project and it's properties set to Content & Copy always. When I install the app on Azure VM (Service Fabric 5 node cluster), it has been deployed to D :\SvcFab_App\Sample_App1\Sample.Code.1.0.0. (D drive is temp storage on Azure VM). When ever I try to convert a video file, I am getting ffmpeg.exe was not found on your system exception. I am able to convert files in development environment and on on-prem server without any exception.

  


  I tried to access ffmpeg.exe using Path.Combine(Directory.GetCurrentDirectory(), “ffmpeg.exe”) and Path.Combine(FabricRuntime.GetActivationContext().GetCodePackageObject(“Code”).Path, “ffmpeg.exe”)

  


• A simple linux on-the-fly video transcoding service via http?

  27 novembre 2019, par Goat Karma

  I’m looking for a simple-to-implement Linux plugin/package/software that can take a large source video from a particular URL, transcode it to a set size and present it to user over http.

  The use case is, we store large(4GB) original MP4 videos in a source system. We want to make these available through universal viewer to end users. The source mp4 files are accessible via URLs (i.e http://example.com/get/video/4747737). Instead of pointing the universal viewer at the 4GB video, we want to point it at an intermediary service (http://example/transcode/4747737?size=720 or whatever) which would transcode the 4GB video into something with a bit more web-friendly size/resolution/bitrate.

  We have ffmpeg already installed, and saw ffserver which is no longer supported. There are various web service wrappers for ffmpeg and I believe ffmpeg has an http service built in,but I can’t decipher whether that is what we need !

  We have PHP available on the web server if there’s a nice easy wrapper to implement(I guess i could call shell_exec for ffmpeg and push the output ?), but I’d probably prefer something pre-packaged to some extent (i.e a debian package, or java jar/war that can run on a port and be proxied).

  Any suggestions ?