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• FFmpeg CPU Usage

  20 juin 2024, par faith0058

  Im using FFmpeg.AutoGen api to decode video stream. The problem is when i have one process, it consumes about 0.5% of cpu,

  


  screenshot from task manager :

  


  

  


  but when im trying to open more such processes (about 20) each of them takes up to 3% and its critical for me.

  


  another screenshot from task manager :

  


  

  


  Both reading packets and decoding happens in different threads.

  


  Reading func

  


  private static unsafe void Read(VideoStreamReader reader)
{
    while (true)
    {
        reader.TryReadNextPacket();
    }
}


  


   public void TryReadNextPacket()
 {
     ffmpeg.av_read_frame(_pFormatContext, _pPacket);

     if (_pPacket->stream_index == _streamIndex)
         Program.packets.Enqueue(*_pPacket);
     else
         ffmpeg.av_packet_unref(_pPacket);
 }


  


  Decoding func

  


   private static unsafe void Decode(VideoStreamDecoder decoder)
 {
     while (true)
     {
         Console.WriteLine($"{packets.Count} BEFORE");
         if (packets.Count > 0)
         {
             packets.TryDequeue(out var packet);
             Console.WriteLine($"{packets.Count} AFTER");
             decoder.TryReadNextFrame(out var frame, packet);

             _frame = frame;
         }
         else
         {
             Thread.Sleep(40);
         }
     }
 }


  


  public void TryReadNextFrame(out AVFrame frame, AVPacket packet)
{
    ffmpeg.avcodec_send_packet(_pCodecContext, &packet);
    ffmpeg.av_packet_unref(&packet);
    ffmpeg.avcodec_receive_frame(_pCodecContext, _pFrame);
    ffmpeg.av_hwframe_transfer_data(_receivedFrame, _pFrame, 0);
    frame = *_receivedFrame;
}


  


  I tried disabling rendering(im using vulkan for it), but CPU still grows with processes, so its not the problem.

  


  Also tried to disable decoding, leaving only rendering running and CPU usage was stable, so its definitely not the problem.

  


• How can I get all handles when I debug a MFC program with Visual Studio ?

  4 décembre 2024, par Goblet Machine

  I have a MFC program with FFMpeg to play video, but when I use the DirectX decoder, I found that every time I close the video, the handle count in Task Manager increases by 3 (sometimes the count decreases after a while, but overall it shows an upward trend).
I tried using WinDbg to capture the handles, but apart from these handles being called by the NVIDIA driver, there was no useful information. So I think maybe I can get more information in Visual Studio.

  


  Can anyone give some help ?

  


• Anomalie #3051 (Fermé) : Perte de config des documents lors de màj 2.1.23 vers 3.0.11

  22 septembre 2013, par Suske -

  Donc pour la perte des configs j’ai corrigé : cest bein dun aux numéros de schémas de base de la mediathque spip 2.1 qui ont commencé à chevaucher ceux de medias pour spip 3.0

  Par contre, le config sur les docs (pas de docs joints aux articles par défaut) remonte bien à SPIP1.9.2b et je n’ai pas de solution siple et propre. Un autre ticket ?