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• how to set nVidia video bitrate in a system service ?

  12 septembre 2021, par qycx

  I use an nvidia card for compression and decompression in a video conferencing software. The program uses ffmpeg. The program is a system service. Need to control the bit rate. But I found that I didn't control it. The setting code rate was 700k, and the actual value was 10M. What went wrong ?

  


  /* put sample parameters */
    pUnit->encV_var.c->bit_rate = bitrate;//400000;
    /* resolution must be a multiple of two */
    pUnit->encV_var.c->width = in_w;//352;
    pUnit->encV_var.c->height = in_h;//288;
    pUnit->encV_var.c->qmin=10;
    pUnit->encV_var.c->qmax=30;
    /* frames per second */
    AVRational t1={1,25};
    t1.den=fps;
    pUnit->encV_var.c->time_base = t1;//(AVRational){1, 25};
    AVRational t2={25,1};
    t2.num=fps;
    pUnit->encV_var.c->framerate = t2;//(AVRational){25, 1};

    /* emit one intra frame every ten frames
     * check frame pict_type before passing frame
     * to encoder, if frame->pict_type is AV_PICTURE_TYPE_I
     * then gop_size is ignored and the output of encoder
     * will always be I frame irrespective to gop_size
     */
    pUnit->encV_var.c->gop_size = 256;//10;
    pUnit->encV_var.c->max_b_frames = 0;//1;
    pUnit->encV_var.c->pix_fmt = AV_PIX_FMT_YUV420P;


  


• System.Diagnostics.Process calling FFMPEG fails with international character

  1er septembre 2013, par Petter Brodin

  I'm using System.Diagnostics.Process to launch FFMPEG, and it works as intended on paths that only contain non-special characters.

  string strParam = "C:\myFolder\foo.png";
  
  
  
  Process ffmpeg = new Process();
  
  
  
  ffmpeg.StartInfo.UseShellExecute = false;
  
  ffmpeg.StartInfo.RedirectStandardOutput = true;
  
  
  
  ffmpeg.StartInfo.FileName = Path_FFMPEG;
  
  ffmpeg.StartInfo.Arguments = strParam;
  
  
  
  ffmpeg.Start();
  
  
  
  ffmpeg.WaitForExit();

  The above example works perfectly, but if I use "c :\myFolder\føø.png" I get the following error message :

  Could find no file with path 'C.\myFolder\f├©├©.png'

  This looks like some kind of encoding error, but that's where my ideas stop.

• 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”)