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• Windows 2003 using php popen "start /b" because of executing ffmpeg.exe

  1er juillet 2013, par Oh Seung Kwon

  I have some problem.

  There is a php code that convert audio(wav) to mp3 file with using ffmpeg.exe.

  Here is some code.

  $cmd = "./inc/ffmpeg.exe -i ".$file_name." -acodec mp3 -y -ac 1 -ab 96k ".$mp3_file_name;
  
  
  
  echo $cmd;
  
  echo "Windows";
  
  $handle = popen("start /B ".$cmd, "r");
  
  while(!feof($handle)) {
  
      $read = fread($handle, 2096);
  
      echo $read;
  
  }
  
  pclose($handle);

  Problem is when I execute this code, ffmpeg.exe process isn't terminated. And not gonna die when I stop process with using Windows task manager.

  Do you have a solution for this situation ?

• Evolution #3284 (En cours) : changer le vert de l’espace privé par defaut

  20 juillet 2015, par b b

  J’ouvre de nouveau puisque la modification a été annulée par r22314 et r22314, cf :

  http://archives.rezo.net/archives/spip-commit.mbox/E7F52BFKBGVZYK4UAOUUUKDI7S7AF4GE/

• FFmpeg - avcodec_receive_frame doesn't receive all frames and lose frames before receving frames

  22 mars 2019, par Jinx

  The vcodec_receive_frame function didn’t receive the rest of the frames. I tested that there were totally 132 frames of the video and it only received 125 frames losing 7 frames at the END of the video. How can I get the lost frames back ?

  But something weird happened. As you can see the output from my MyDecode::receiveFrame() function. The code inside the block if (ret != 0){} executed first, but the lost frames are at the end of the video. So how could they come out first ? What caused this happen ?

  MyDecode.cpp

  AVFrame* MyDecode::receiveFrame()
  
  {
  
      mux.lock();
  
      if (!codecCtx) {
  
          mux.unlock();
  
          return 0;
  
      }
  
      AVFrame* frame = av_frame_alloc();
  
      int ret = avcodec_receive_frame(codecCtx, frame);
  
      mux.unlock();
  
      if (ret != 0)
  
      {
  
          static int lost_frames = 1;
  
          std::cout << "Lost frames: " << lost_frames << std::endl;
  
          lost_frames += 1;
  
          av_frame_free(&frame);
  
          return nullptr;
  
      }
  
      std::cout << "Received frames: " << received_frame_num << std::endl;
  
      received_frame_num += 1;
  
      return frame;
  
  }
  
  
  
  bool MyDecode::sendPacket(AVPacket* packet)
  
  {
  
      if (!packet || !packet->data || packet->size == 0)
  
          return false;
  
      mux.lock();
  
      if (!codecCtx) {
  
          mux.unlock();
  
          return false;
  
      }
  
      int ret = avcodec_send_packet(codecCtx, packet);
  
      mux.unlock();
  
      av_packet_free(&packet);
  
      if (ret != 0) {
  
          return false;
  
      }
  
      return true;
  
  }

  Console output

  Total frames: 132
  
  Lost frames: 1
  
  Lost frames: 2
  
  Lost frames: 3
  
  Lost frames: 4
  
  Lost frames: 5
  
  Lost frames: 6
  
  Lost frames: 7
  
  Received frames: 1
  
  Received frames: 2
  
  Received frames: 3
  
  ................
  
  Received frames: 125

  UPDATE :

  MyDemux.cpp

  AVPacket* MyDemux::readFrame()
  
  {
  
      mux.lock();
  
      if (!formatCtx) {
  
          std::cout << "formaetCtx is null" << std::endl;
  
          mux.unlock();
  
          return nullptr;
  
      }
  
      AVPacket* packet = av_packet_alloc();
  
      if (!packet) {
  
          std::cout << "packet is null" << std::endl;
  
          mux.unlock();
  
          return nullptr;
  
      }
  
  
  
      int ret = av_read_frame(formatCtx, packet);
  
      if (ret != 0) {
  
          while (true) {
  
              av_read_frame(formatCtx, nullptr);
  
          }
  
          mux.unlock();
  
          av_packet_free(&packet);
  
          av_packet_unref(packet);
  
          return nullptr;
  
      }
  
      media_type = packet->stream_index;
  
      mux.unlock();
  
      return packet;
  
  }

  main.cpp

  while (true) {
  
              AVPacket* pkt = demux.readFrame();
  
              if (demux.get_media_type() == 0) {
  
                  AVFrame* frame = video_decode.receiveFrame();
  
                  videoWidget->paintFrame(frame);
  
              }
  
              else if (demux.get_media_type() == 1) {
  
              }
  
              if (!pkt) {
  
                  std::cout << "to break" << std::endl;
  
                  break;
  
              }
  
          }